CN113808547B - Light emitting device driving circuit, backlight module and display panel - Google Patents
Light emitting device driving circuit, backlight module and display panel Download PDFInfo
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- CN113808547B CN113808547B CN202111128046.8A CN202111128046A CN113808547B CN 113808547 B CN113808547 B CN 113808547B CN 202111128046 A CN202111128046 A CN 202111128046A CN 113808547 B CN113808547 B CN 113808547B
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- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/3406—Control of illumination source
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The application discloses a light emitting device driving circuit, a backlight module and a display panel. The light emitting device driving circuit comprises a driving transistor, a data writing module, a light emitting module and a light emitting control module. The light-emitting module comprises a first light-emitting device and a second light-emitting device, wherein the positive electrode and the negative electrode of the first light-emitting device are reversely arranged. According to the display panel, the luminous control modules are arranged, the first luminous devices and the second luminous devices are controlled to alternately emit light respectively through the first control signals and the second control signals, the luminous brightness uniformity among the luminous modules is improved, and therefore the taste of the display panel is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a light emitting device driving circuit, a backlight module and a display panel.
Background
Mini LED (Mini Light-Emitting Diode) display and Micro LED (Micro Light-Emitting Diode) display are new generation display technologies, and have shown good display characteristics, such as high contrast ratio, high color gamut, high response speed, wide viewing angle, and the like, and are widely used in the high performance display field at present. However, the manufacturing process of Mini LEDs and Micro LEDs is complex, and the current huge transfer of Micro LEDs has low maturity, low reliability and high cost, and is extremely difficult to apply to large size, thereby having negative influence on future development.
Therefore, nano LED (Light-Emitting Diode) display technology has been developed. However, since each pixel includes a large number of Nano LEDs, providing a driving circuit capable of ensuring uniform light emission brightness among pixels is still a technical problem to be solved.
Disclosure of Invention
The application provides a light emitting device driving circuit, a backlight module and a display panel, so as to improve the uniformity of light emitting brightness among all light emitting modules.
The present application provides a light emitting device driving circuit, which includes:
the source electrode and the drain electrode of the driving transistor are connected in series with a light-emitting loop formed by the first power supply signal and the second power supply signal;
the data writing module is connected with a scanning signal and a data signal, and is electrically connected to the grid electrode of the driving transistor, and the data writing module is used for writing the data signal into the grid electrode of the driving transistor under the control of the scanning signal;
the light-emitting module comprises at least one first light-emitting device and at least one second light-emitting device, wherein the anode of the first light-emitting device and the cathode of the second light-emitting device are electrically connected to a first node, and the cathode of the first light-emitting device and the anode of the second light-emitting device are electrically connected to a second node;
the light-emitting control module is connected with a first control signal, a second control signal and the second power supply signal, and is electrically connected with one of a source electrode and a drain electrode of the driving transistor, the first node and the second node, and the light-emitting control module is used for controlling the first light-emitting device and the second light-emitting device to alternately emit light under the control of the first control signal and the second control signal.
Optionally, in some embodiments of the present application, the data writing module includes a first transistor and a storage capacitor;
the grid electrode of the first transistor is connected with the scanning signal, one of the source electrode and the drain electrode of the first transistor is connected with the data signal, the other of the source electrode and the drain electrode of the first transistor, one end of the storage capacitor and the grid electrode of the driving transistor are electrically connected, and the other end of the storage capacitor is electrically connected with one of the source electrode and the drain electrode of the driving transistor.
Optionally, in some embodiments of the present application, the light emission control module includes a first light emission control module and a second light emission control module;
the first light emitting control module is connected to the first control signal and the second power signal, and is electrically connected to one of a source electrode and a drain electrode of the driving transistor, the first node and the second node, and the first light emitting control module is used for controlling the first light emitting device to emit light under the control of the first control signal;
the second light-emitting control module is connected with the second control signal and the second power supply signal, and is electrically connected with one of a source electrode and a drain electrode of the driving transistor, the first node and the second node, and the second light-emitting control module is used for controlling the second light-emitting device to emit light under the control of the second control signal.
Optionally, in some embodiments of the present application, the first light emitting control module includes a second transistor and a third transistor;
the grid electrode of the second transistor is connected with the first control signal, one of the source electrode and the drain electrode of the second transistor is electrically connected with one of the source electrode and the drain electrode of the driving transistor, the other of the source electrode and the drain electrode of the second transistor and the grid electrode of the third transistor are electrically connected with the first node, one of the source electrode and the drain electrode of the third transistor is electrically connected with the second node, and the other of the source electrode and the drain electrode of the third transistor is connected with the second power supply signal;
the second light-emitting control module comprises a fourth transistor and a fifth transistor;
the grid electrode of the fourth transistor is connected with the second control signal, one of the source electrode and the drain electrode of the fourth transistor is electrically connected with one of the source electrode and the drain electrode of the driving transistor, the other of the source electrode and the drain electrode of the fourth transistor is electrically connected with the grid electrode of the fifth transistor at the second node, one of the source electrode and the drain electrode of the fifth transistor is electrically connected with the first node, and the other of the source electrode and the drain electrode of the fifth transistor is connected with the second power supply signal.
Optionally, in some embodiments of the present application, the light emitting device driving circuit further includes a sensing module, where the sensing module is connected to the sensing signal and the third control signal and is electrically connected to one of the source and the drain of the driving transistor, and the sensing module is configured to detect a threshold voltage of the driving transistor under control of the third control signal and the sensing signal.
Optionally, in some embodiments of the present application, the sensing module includes a sixth transistor, a gate of the sixth transistor is connected to the third control signal, one of a source and a drain of the sixth transistor is connected to the sensing signal, and the other of the source and the drain of the sixth transistor is electrically connected to the other of the source and the drain of the driving transistor.
Optionally, in some embodiments of the present application, the first control signal and the second control signal remain inverted;
in a frame of display picture, the potentials of the first control signal and the second control signal are switched at least once.
Optionally, in some embodiments of the present application, the first light emitting device and the second light emitting device are both nano light emitting diodes.
Correspondingly, the application also provides a backlight module, it includes:
a data line for providing a data signal;
a scan line for providing a scan signal;
a first control signal line for providing a first control signal;
a second control signal line for providing a second control signal;
a third control signal line for providing a third control signal; and
the light emitting device driving circuit according to any one of the above, wherein the light emitting device driving circuit is connected to the data line, the scanning line, the first control signal line, the second control signal line, and the third control signal line.
Correspondingly, the application also provides a display panel, which comprises a plurality of pixel units arranged in an array, wherein each pixel unit comprises the light-emitting device driving circuit as described in any one of the above.
The application provides a light emitting device driving circuit, a backlight module and a display panel. The light emitting device driving circuit comprises a driving transistor, a data writing module, a light emitting module and a light emitting control module. The light emitting module comprises a first light emitting device and a second light emitting device, and the positive and negative poles (P pole and N pole) of the first light emitting device are opposite to the positive and negative poles of the second light emitting device in arrangement direction. According to the backlight module, the luminous control modules are arranged, the first luminous devices and the second luminous devices are controlled to alternately emit light respectively through the first control signals and the second control signals, the luminous brightness uniformity among the luminous modules is improved, and therefore the luminous brightness uniformity of the backlight module and the taste of the display panel are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a first structure of a light emitting device driving circuit provided in the present application;
fig. 2 is a schematic diagram of a second structure of the light emitting device driving circuit provided in the present application;
FIG. 3 is a schematic circuit diagram of a light emitting device driving circuit provided herein;
fig. 4 is a schematic plan view of a light emitting module in a light emitting device driving circuit provided in the present application;
fig. 5 is a timing chart of a light emitting device driving circuit provided in the present application;
fig. 6 is a schematic structural diagram of a backlight module provided in the present application;
FIG. 7 is a schematic structural diagram of a display panel provided in the present application;
FIG. 8 is a schematic cross-sectional view of the display panel of FIG. 7 along XX'.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be interpreted as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, features defining "first" and "second", etc., may explicitly or implicitly include one or more of such features and thus should not be construed as limiting the application.
The transistors used in all embodiments of the present application may be thin film transistors or field effect transistors or other devices with the same characteristics, and the source and drain of the transistors used herein are symmetrical, so that the source and drain may be interchanged. In the embodiment of the present application, to distinguish between two electrodes of the transistor except the gate, one electrode is referred to as a source electrode and the other electrode is referred to as a drain electrode. The middle terminal of the switching transistor is defined as a gate, the signal input terminal is defined as a source, and the output terminal is defined as a drain according to the form in the figure. In addition, the transistors used in the embodiments of the present application may include two types of P-type transistors and/or N-type transistors, where the P-type transistors are turned on when the gate is at a low level, turned off when the gate is at a high level, and the N-type transistors are turned on when the gate is at a high level, and turned off when the gate is at a low level.
The application provides a light emitting device driving circuit, a backlight module and a display panel, and the detailed description is given below. It should be noted that the following description order of the embodiments is not intended to limit the preferred order of the embodiments of the present application.
Referring to fig. 1, fig. 1 is a schematic diagram of a first structure of a driving circuit of a light emitting device provided in the present application. The application provides a light emitting device driving circuit 100, which includes a driving transistor TD, a data writing module 101, a light emitting module 102, and a light emitting control module 103.
The source and the drain of the driving transistor TD are connected in series to a light emitting circuit formed by the first power signal VDD and the second power signal VSS.
The data writing module 101 is connected to the scan signal GA and the data signal DA, and is electrically connected to the gate of the driving transistor TD. The data writing module 101 is configured to write the data signal DA to the gate of the driving transistor TD under the control of the scan signal GA.
The light emitting module 102 includes at least one first light emitting device LED1 and at least one second light emitting device LED2. The anode of the first light emitting device LED1 and the cathode of the second light emitting device LED2 are electrically connected to the first node a. The cathode of the first light emitting device LED1 and the anode of the second light emitting device LED2 are both electrically connected to the second node B.
The light emitting control module 103 is connected to the first control signal EM1, the second control signal EM2, and the second power signal VSS, and is electrically connected to one of the source and the drain of the driving transistor TD, the first node a, and the second node B. The light emission control module 103 is configured to control the first light emitting device LED1 and the second light emitting device LED2 to alternately emit light under the control of the first control signal EM1 and the second control signal EM2.
In the light emitting device driving circuit 100 provided in the present application, the light emitting module 102 includes a first light emitting device LED1 and a second light emitting device LED2. Wherein the first light emitting device LED1 and the second light emitting device LED2 are arranged in reverse. That is, the positive and negative electrodes of the first light emitting device LED1 and the positive and negative electrodes of the second light emitting device LED2 are reversed. Since it is not guaranteed that the proportions of the first light emitting device LED1 and the second light emitting device LED2 are the same in the different light emitting modules 102. Therefore, the light-emitting control module 103 is arranged, and the first light-emitting device LED1 and the second light-emitting device LED2 are controlled to emit light alternately through the first control signal EM1 and the second control signal EM2, so that the uniformity of the light-emitting brightness among the light-emitting modules 102 is improved.
Further, the light emitting device driving circuit 100 provided herein further includes a sensing module 105. The sensing module 105 is connected to the sensing signal SE and the third control signal EM3, and is electrically connected to one of the source and the drain of the driving transistor TD. The sensing module 105 is configured to detect a threshold voltage of the driving transistor TD under the control of the third control signal EM3 and the sensing signal SE.
Specifically, the sensing module 105 is mainly used for detecting the threshold voltage shift of the driving transistor TD. The sensing module 105 operates in a non-display phase. That is, the sensing module 105 is not operated in the light emitting stage of the light emitting device driving circuit 100. It is understood that the detection is performed when the display is not needed (e.g., during a shutdown phase of the display, for detecting for a prolonged period of time), and then the detection result is stored in the display system. When the light emitting device driving circuit 100 starts to operate again, the data detected previously is fed back to the display system to perform the threshold voltage compensation.
By adding the sensing module 105 in the light emitting device driving circuit 100, the threshold voltage offset of the driving transistor TD can be compensated, so that brightness attenuation of the first light emitting device LED1 and the second light emitting device LED2 caused by the threshold voltage offset of the driving transistor TD is avoided.
Further, referring to fig. 1 and fig. 2, fig. 2 is a schematic diagram of a second structure of the driving circuit of the light emitting device provided in the present application. The difference from the light emitting device driving circuit 100 shown in fig. 1 is that in the present embodiment, the light emission control module 103 includes a first light emission control module 1031 and a second light emission control module 1032.
The first light emitting control module 1031 is connected to the first control signal EM1 and the second power signal VSS, and is electrically connected to one of the source and the drain of the driving transistor TD, the first node a, and the second node B. The first light emitting control module 1031 is configured to control the first light emitting device LED1 to emit light under the control of the first control signal EM1.
The second light emitting control module 1032 is connected to the second control signal EM2 and the second power signal VSS, and is electrically connected to one of the source and the drain of the driving transistor TD, the first node a and the second node B. The second light emitting control module 1032 is configured to control the second light emitting device LED2 to emit light under the control of the second control signal EM2.
The present application provides a first light emission control module 1031 and a second light emission control module 1032. The first light emitting control module 1031 may be controlled by the first control signal EM1, and the second light emitting control module 1032 may be controlled by the second control signal EM2, so as to control the first light emitting device LED1 and the second light emitting device LED2 to emit light, respectively, and improve uniformity of light emission luminance between the light emitting modules 102.
In some embodiments, referring to fig. 3, fig. 3 is a schematic circuit diagram of a light emitting device driving circuit provided in the present application. As shown in fig. 2 and 3, in the present application, the data writing module 101 includes a first transistor T1 and a storage capacitor Cst.
Specifically, the gate of the first transistor T1 is connected to the scan signal GA. One of the source and the drain of the first transistor T1 is connected to the data signal DA. The other of the source and the drain of the first transistor T1, one end of the storage capacitor Cst, and the gate of the driving transistor TD are electrically connected. The other end of the storage capacitor Cst is electrically connected to one of the source and the drain of the driving transistor TD. Of course, it is understood that the data writing module 101 may also be formed by using a plurality of transistors and a capacitor in series.
In some embodiments of the present application, the first light emitting control module 1031 includes a second transistor T2 and a third transistor T3. The gate of the second transistor T2 is connected to the first control signal EM1. One of the source and the drain of the second transistor T2 is electrically connected to one of the source and the drain of the driving transistor TD. The other of the source and the drain of the second transistor T2 and the gate of the third transistor T3 are electrically connected to the first node a. One of a source and a drain of the third transistor T3 is electrically connected to the second node B. The other of the source and the drain of the third transistor T3 is connected to the second power supply signal VSS. Of course, it is understood that the first light emitting control module 1031 may further include a plurality of transistors disposed in series, which may be controlled by the first control signal EM1 or may be controlled by a plurality of control signals respectively.
In some embodiments of the present application, the second light emitting control module 1032 includes a fourth transistor T4 and a fifth transistor T5. The gate of the fourth transistor T4 is connected to the second control signal EM2. One of the source and the drain of the fourth transistor T4 is electrically connected to one of the source and the drain of the driving transistor TD. The other of the source and the drain of the fourth transistor T4 and the gate of the fifth transistor T5 are electrically connected to the second node B. One of the source and the drain of the fifth transistor T5 is electrically connected to the first node a. The other of the source and the drain of the fifth transistor T5 is connected to the second power supply signal VSS. Of course, it is understood that the second light emitting control module 1032 may further include a plurality of transistors disposed in series, which may be controlled by the second control signal EM2 or may be controlled by a plurality of control signals respectively.
In some embodiments of the present application, the sensing module 105 includes a sixth transistor T6. The gate of the sixth transistor T6 is connected to the third control signal EM3. One of the source and the drain of the sixth transistor T6 is connected to the sensing signal SE. The other of the source and the drain of the sixth transistor T6 is electrically connected to the other of the source and the drain of the driving transistor TD. Of course, it is understood that the sense module 105 may also be formed with a plurality of transistors in series.
In the present application, the light emitting module 102 includes at least one first light emitting device LED1 and at least one second light emitting device LED2. Specifically, the first light emitting device LED1 and the second light emitting device LED2 are both nano light emitting diodes.
In each light emitting module 102, the first light emitting device LED1 may be set to 1 to 1000, and the second light emitting device LED2 may be set to 1 to 1000. For example, the first light emitting device LED1 may be set to 1, and the second light emitting device LED2 may be set to 1; the first light emitting device LED1 may be set to 100, and the second light emitting device LED2 may be set to 100; the first light emitting device LED1 may be set to 500, and the second light emitting device LED2 may be set to 600; the first light emitting device LED1 may be set to 1000, the second light emitting device LED2 may be set to 1000, and so on.
In each light emitting module 102, the number of the first light emitting device LED1 and the second light emitting device LED2 may be the same or different. In each light emitting module 102, the first light emitting devices LED1 and the second light emitting devices LED2 may be alternately arranged according to a certain rule, or may be arranged according to actual arrangement.
Specifically, referring to fig. 4, fig. 4 is a schematic plan view of a light emitting module provided in the present application. The present application is described by taking an example in which the first light emitting devices LED1 and the second light emitting devices LED2 are alternately arranged, but it is not to be construed as limiting the present application.
As can be seen from fig. 4, the first light emitting device LED1 includes an insulating protective layer 11 and a light emitting layer 12 disposed on the insulating protective layer 11. The light emitting layer 12 has P-doped regions (positive electrodes) and N-doped regions (negative electrodes) at both ends, respectively. The manufacturing process of the first light emitting device LED1 is a technology well known to those skilled in the art, and will not be described herein. In addition, the second light emitting device LED2 is different from the first light emitting device LED1 only in that the positive and negative directions are opposite, and a detailed description thereof is omitted.
In this application, inkjet printing (Ink jet print) process is typically used to print Nano LEDs onto thin film transistor substrates. Because the Nano LEDs cannot be aligned in 100% of a certain direction, the sequence of the positive and negative poles of the Nano LEDs in opposite directions can be generated. Such as a first light emitting device LED1 and a second light emitting device LED2. Accordingly, the present application provides the first and second light emission control modules 1031 and 1032, which can control the light emission of the first and second light emitting devices LED1 and LED2, respectively. Thus, if 50% -50% of alternate light emission is adopted, it is ensured that the total final light emission amount is 100% no matter how much the ratio of the number of the first light emitting devices LED1 and the number of the second light emitting devices LED2 in the light emitting module 102 deviates. Thus, the problem of uneven light emission of different light emitting modules 102 caused by different proportions of the first light emitting device LED1 and the second light emitting device LED2 in the light emitting modules 102 can be improved, so that the display taste of the Nano LED display is improved.
In this application, the first power signal VDD and the second power signal VSS are both used to output a predetermined voltage value. In addition, in the present application, the potential of the first power supply signal VDD is greater than the potential of the second power supply signal VSS. Specifically, the potential of the second power signal VSS may be the potential of the ground terminal. Of course, it is understood that the potential of the second power supply signal VSS may be other.
In the present application, the driving transistor TD, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, and the sixth transistor T6 may be one or more of a low temperature polysilicon thin film transistor, an oxide semiconductor thin film transistor, or an amorphous silicon thin film transistor. In addition, the transistor in the light emitting device driving circuit 100 provided in the present application may be a P-type transistor or an N-type transistor. Further, the transistors in the light emitting device driving circuit 100 provided in the present application may be set to be the same type of transistors, so as to avoid the influence of the variability between different types of transistors on the light emitting device driving circuit 100.
The following embodiments of the present application will be described by taking the driving transistor TD, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5 and the sixth transistor T6 as N-type transistors as examples, but the present application is not limited thereto.
Referring to fig. 5, fig. 5 is a timing chart of a driving circuit of a light emitting device provided in the present application. The combination of the scan signal GA, the data signal DA, the first control signal EM1 and the second control signal EM2 corresponds to the data writing phase t1 and the light emitting phase t2. That is, the driving control timing of the light emitting device driving circuit 100 provided in the present application includes a data writing period t1 and a light emitting period t2 within one frame time.
In the data writing stage T1, the scan signal GA has a low potential to be changed to a high potential, and the first transistor T1 is turned on. The data signal DA charges the storage capacitor Cst. At this time, the potential of the data signal DA is written into the gate of the driving transistor TD through the first transistor T1, and the driving transistor TD is turned on. The potential of the first power supply signal VDD flows to the drain of the driving transistor TD through the source of the driving transistor TD. The storage capacitor Cst is used to stabilize the potential of the gate electrode of the driving transistor TD.
Meanwhile, in the data writing stage T1, since the first control signal EM1 and the second control signal EM2 are both low, the second transistor T2, the third transistor T3, the fourth transistor T4 and the fifth transistor T5 are all turned off.
In the light emission period t2, first, the first control signal EM1 is at a high potential. The second transistor T2 is turned on. The potential of the first power supply signal VDD is written into the first node a via the second transistor T2. Since the gate of the third transistor T3 is electrically connected to the first node a, the third transistor T3 is turned on. The first power signal VDD, the driving transistor TD, the second transistor T2, the first light emitting device LED1, the third transistor T3, and the second power signal VSS form a path, and the first light emitting device LED1 emits light normally.
At the same time, the first control signal EM2 is low. The fourth transistor T4 and the fifth transistor T5 are turned off. Since the positive electrode of the second light emitting device LED2 is connected to the low voltage signal, the negative electrode is connected to the high voltage signal. Accordingly, the second light emitting device LED2 is in a non-light emitting state.
Then, the second control signal EM2 transitions from the low potential to the high potential. The fourth transistor T4 is turned on. The potential of the first power supply signal VDD is written into the second node B via the fourth transistor T4. Since the gate of the fifth transistor T5 is electrically connected to the second node B, the fifth transistor T5 is turned on. The first power signal VDD, the driving transistor TD, the fourth transistor T4, the second light emitting device LED2, the fifth transistor T5, and the second power signal VSS form a path, and the second light emitting device LED2 emits light normally.
At the same time, the second control signal EM1 transitions from a high potential to a low potential. The second transistor T2 and the third transistor T3 are turned off. Since the positive electrode of the second light emitting device LED2 is connected to the low voltage signal, the negative electrode is connected to the high voltage signal. Accordingly, the second light emitting device LED2 is in a non-light emitting state.
It can be appreciated that during the light emitting phase t2, the first control signal EM1 and the second control signal EM2 remain inverted, on the one hand, so that both the first light emitting device LED1 and the second light emitting device LED2 in the light emitting module 102 can emit light. On the other hand, the first and second light emission control modules 1031 and 1032 are caused to alternately operate, thereby extending the life of the light emitting device driving circuit 100.
Further, in one frame of display screen, the potentials of the first control signal EM1 and the second control signal EM2 are switched at least once. Thereby ensuring that the first light emitting device LED1 and the second light emitting device LED2 are lit at least once, respectively, within a frame. If the first light emitting device LED1 and the second light emitting device LED2 are required to emit light in turn a plurality of times, the potentials of the first control signal EM1 and the second control signal EM2 need to be switched a plurality of times.
In the display screen of one frame, the number of light emission times and the light emission time period of the first light emitting device LED1 and the second light emitting device LED2 may be the same or different. Specifically, the adjustment of the electric potentials of the first control signal EM1 and the second control signal EM2 and the duty ratio can be realized. For example, the first light emitting device LED1 and the second light emitting device LED2 may emit light alternately by 50% -50%, so as to ensure that the total amount of final light emission is 100% no matter how much the ratio of the number of the first light emitting device LED1 and the number of the second light emitting device LED2 in the light emitting module 102 deviates. The first light emitting device LED1 and the second light emitting device LED2 may emit light alternately in an amount of 30% -70%, and may be specifically set according to the number ratio of the first light emitting device LED1 and the second light emitting device LED2 in the light emitting module 102 and the requirement of the light emitting brightness.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a backlight module according to an embodiment of the disclosure. The embodiment also provides a backlight module 200, which includes a scan line 21, a data line 22, a first control signal line 23, a second control signal line 24, a third control signal line 25, and the light emitting device driving circuit 100 described in any of the above embodiments. Wherein the scan line 21 is used for providing a scan signal. The data line 22 is used to provide a data signal. The first control signal line 23 is for providing a first control signal. The second control signal line 24 is used for providing a second control signal. The third control signal line 25 is for providing a third control signal. The light emitting device driving circuit 100 is connected to the scanning line 21, the data line 22, the first control signal line 23, the second control signal line 24, and the third control signal line 25, respectively. The light emitting device driving circuit 100 may be specifically referred to the above description of the light emitting device driving circuit, and will not be described herein.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the disclosure. The embodiment of the present application further provides a display panel 300, including a plurality of pixel units 301 arranged in an array, where each pixel unit 301 includes the light emitting device driving circuit 100 described above, and the description of the light emitting device driving circuit 100 may be referred to above, which is not repeated herein.
Specifically, referring to fig. 3, 7 and 8, fig. 8 is a schematic cross-sectional view of the display panel of fig. 7 along XX'. The pixel unit 301 includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel.
Wherein each sub-pixel comprises a plurality of Nano LEDs. The P-N electrodes (positive and negative electrodes) of the Nano LED are connected with the electrodes on the substrate. The plurality of Nano LEDs includes a first light emitting device LED1 and a second light emitting device LED2 which are arranged in reverse. The cross-sectional view of the display panel 300 shown in fig. 7 is described only by way of example of the first light emitting device LED1, but is not to be construed as limiting the present application.
Specifically, the display panel 300 includes a driving substrate 31, a light emitting function layer 32, a light conversion function layer 33, and an encapsulation layer 34. The driving substrate 31 includes a substrate 311, an interlayer dielectric layer 312, a first passivation layer 313, and a second passivation layer 314. The driving substrate 31 is further provided with a driving circuit of the light emitting device, and fig. 7 shows only a partial structure of the driving circuit of the light emitting device, such as the second transistor T2. The light emitting function layer 32 includes a pixel electrode 321, a first bank 322, and a bridge wire 323. A first light emitting device LED1 (a second light emitting device LED2 is not shown) is disposed between adjacent first banks 322. The light conversion functional layer 33 includes a second bank 331 and a quantum dot conversion layer. The quantum dot conversion layer includes a red quantum dot conversion layer 332 and a green quantum dot conversion layer 333. The second retaining walls 331 and the first retaining walls 322 are disposed in a one-to-one correspondence.
Specifically, the anode of the first light emitting device LED1 is connected to the first node a, that is, to one of the source and the drain of the second transistor T2. The N-pole of the first light emitting device LED1 is connected to the second power supply signal VSS through the pixel electrode 321. Wherein, the outside of the first light emitting device LED1 is an insulating protection layer. Openings (not shown) are provided in the insulating protective layer to expose the P-and N-poles of the first light emitting device LED 1. The P-pole and N-pole of the first light emitting device LED1 are connected to the driving substrate 31 side circuit through bridging lines 323, respectively.
Wherein the first light emitting device LED1 emits blue light. In the red sub-pixel, blue light emitted from the first light emitting device LED1 emits red light by irradiating the red quantum dot conversion layer 332. In the green sub-pixel, blue light emitted from the first light emitting device LED1 emits red and green by irradiating the green quantum dot conversion layer 333. In the blue sub-pixel, a quantum dot conversion layer is not arranged above the first light emitting device LED1, and blue light is directly emitted from the first light emitting device LED 1.
Of course, in some embodiments of the present application, the first light emitting device LED1 and the second light emitting device LED2 may directly emit red light, green light, and blue light, so that the quantum dot conversion layer is omitted.
In other embodiments of the present application, the first light emitting device LED1 and the second light emitting device LED2 may also be designed to emit light of a long wavelength, such as red light. Emission of green and blue light is then achieved by exciting the up-conversion nanoparticles. The present application is not particularly limited thereto.
The display panel 300 provided by the application adopts the Nano LED to display pixels, and uses the light emitting device driving circuit described in any of the embodiments to drive, so that the uniformity of the light emitting brightness between the pixel units 301 can be improved, thereby improving the taste of the display panel 300.
The foregoing has outlined rather broadly the more detailed description of embodiments of the present application, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, the above examples being provided solely to assist in the understanding of the methods of the present application and the core ideas thereof; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (9)
1. A light emitting device driving circuit, comprising:
the source electrode and the drain electrode of the driving transistor are connected in series with a light-emitting loop formed by the first power supply signal and the second power supply signal;
the data writing module is connected with a scanning signal and a data signal, and is electrically connected to the grid electrode of the driving transistor, and the data writing module is used for writing the data signal into the grid electrode of the driving transistor under the control of the scanning signal;
the light-emitting module comprises at least one first light-emitting device and at least one second light-emitting device, wherein the anode of the first light-emitting device and the cathode of the second light-emitting device are electrically connected to a first node, and the cathode of the first light-emitting device and the anode of the second light-emitting device are electrically connected to a second node;
the light-emitting control module is connected with a first control signal, a second control signal and the second power supply signal, and is electrically connected with one of a source electrode and a drain electrode of the driving transistor, the first node and the second node, and the light-emitting control module is used for controlling the first light-emitting device and the second light-emitting device to alternately emit light under the control of the first control signal and the second control signal;
the sensing module is connected with a sensing signal and a third control signal and is electrically connected with one of a source electrode and a drain electrode of the driving transistor, and the sensing module is used for detecting the threshold voltage of the driving transistor under the control of the third control signal and the sensing signal; the sensing module works in a shutdown stage.
2. The light-emitting device driving circuit according to claim 1, wherein the data writing module includes a first transistor and a storage capacitor;
the grid electrode of the first transistor is connected with the scanning signal, one of the source electrode and the drain electrode of the first transistor is connected with the data signal, the other of the source electrode and the drain electrode of the first transistor, one end of the storage capacitor and the grid electrode of the driving transistor are electrically connected, and the other end of the storage capacitor is electrically connected with one of the source electrode and the drain electrode of the driving transistor.
3. The light-emitting device driving circuit according to claim 1, wherein the light-emission control module includes a first light-emission control module and a second light-emission control module;
the first light emitting control module is connected to the first control signal and the second power signal, and is electrically connected to one of a source electrode and a drain electrode of the driving transistor, the first node and the second node, and the first light emitting control module is used for controlling the first light emitting device to emit light under the control of the first control signal;
the second light-emitting control module is connected with the second control signal and the second power supply signal, and is electrically connected with one of a source electrode and a drain electrode of the driving transistor, the first node and the second node, and the second light-emitting control module is used for controlling the second light-emitting device to emit light under the control of the second control signal.
4. The light-emitting device driving circuit according to claim 3, wherein the first light-emitting control module includes a second transistor and a third transistor;
the grid electrode of the second transistor is connected with the first control signal, one of the source electrode and the drain electrode of the second transistor is electrically connected with one of the source electrode and the drain electrode of the driving transistor, the other of the source electrode and the drain electrode of the second transistor and the grid electrode of the third transistor are electrically connected with the first node, one of the source electrode and the drain electrode of the third transistor is electrically connected with the second node, and the other of the source electrode and the drain electrode of the third transistor is connected with the second power supply signal;
the second light-emitting control module comprises a fourth transistor and a fifth transistor;
the grid electrode of the fourth transistor is connected with the second control signal, one of the source electrode and the drain electrode of the fourth transistor is electrically connected with one of the source electrode and the drain electrode of the driving transistor, the other of the source electrode and the drain electrode of the fourth transistor is electrically connected with the grid electrode of the fifth transistor at the second node, one of the source electrode and the drain electrode of the fifth transistor is electrically connected with the first node, and the other of the source electrode and the drain electrode of the fifth transistor is connected with the second power supply signal.
5. The light-emitting device driving circuit according to claim 1, wherein the sensing module comprises a sixth transistor, a gate of the sixth transistor is connected to the third control signal, one of a source and a drain of the sixth transistor is connected to the sensing signal, and the other of the source and the drain of the sixth transistor is electrically connected to the other of the source and the drain of the driving transistor.
6. The light-emitting device driving circuit according to claim 1, wherein the first control signal and the second control signal remain inverted;
in a frame of display picture, the potentials of the first control signal and the second control signal are switched at least once.
7. The light-emitting device driver circuit of claim 1, wherein the first light-emitting device and the second light-emitting device are each a nano-light-emitting diode.
8. A backlight module, comprising:
a data line for providing a data signal;
a scan line for providing a scan signal;
a first control signal line for providing a first control signal;
a second control signal line for providing a second control signal;
a third control signal line for providing a third control signal; and
the light emitting device driving circuit according to any one of claims 1 to 7, wherein the light emitting device driving circuit is connected to the data line, the scan line, the first control signal line, the second control signal line, and the third control signal line.
9. A display panel comprising a plurality of pixel cells arranged in an array, each of the pixel cells comprising the light emitting device driving circuit according to any one of claims 1-7.
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| CN114203103B (en) * | 2021-12-20 | 2023-05-02 | 深圳市华星光电半导体显示技术有限公司 | Light-emitting circuit, backlight module and display panel |
| CN114530120B (en) * | 2022-03-15 | 2023-06-02 | Tcl华星光电技术有限公司 | Pixel circuit, pixel driving method and display device |
| CN115376472B (en) * | 2022-09-29 | 2023-09-19 | 惠科股份有限公司 | Backlight module, display module and electronic equipment |
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| CN201044520Y (en) * | 2006-12-12 | 2008-04-02 | 王欣 | Double-line, two-route lamp string controller |
| CN201243394Y (en) * | 2008-08-21 | 2009-05-20 | 咸瑞科技股份有限公司 | Control circuit of LED device |
| CN103366682B (en) * | 2013-07-25 | 2015-06-17 | 京东方科技集团股份有限公司 | Alternating current drive OLED (Organic Light Emitting Diode) circuit, driving method and display device |
| CN105185321B (en) * | 2015-10-27 | 2018-05-29 | 深圳市华星光电技术有限公司 | AMOLED driving circuits, display panel and display |
| CN106991967A (en) * | 2017-05-27 | 2017-07-28 | 深圳市华星光电技术有限公司 | Pixel-driving circuit and its restorative procedure and display device |
| CN109427301B (en) * | 2018-05-09 | 2021-01-22 | 京东方科技集团股份有限公司 | Pixel circuit, electroluminescent display panel, driving method thereof and display device |
| CN110278638B (en) * | 2019-07-24 | 2024-08-06 | 深圳市安托山技术有限公司 | LED light source alternating type lighting system and method controlled by PWM signal |
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