CN115101006B - Light-emitting driving circuit and display device - Google Patents
Light-emitting driving circuit and display device Download PDFInfo
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- CN115101006B CN115101006B CN202210875995.0A CN202210875995A CN115101006B CN 115101006 B CN115101006 B CN 115101006B CN 202210875995 A CN202210875995 A CN 202210875995A CN 115101006 B CN115101006 B CN 115101006B
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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]
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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]
- G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
Abstract
The application provides a light-emitting driving circuit and a display device. Wherein, the luminous drive circuit includes power module and lamp cluster group, and lamp cluster group includes the lamp cluster, and power module's output is connected the input of lamp cluster, and power module is used for exporting supply voltage to the lamp cluster, and lamp cluster group still includes: the first end of the first response switch is connected with the output end of the light string, the second end of the first response switch is connected with a first power line for providing black state voltage, the control end of the first response switch is connected with a first signal line for providing a first control signal, and the control end of the first response switch is used for providing the black state voltage to the output end of the light string in response to the first control signal; the power supply module responds to the second control signal, and stops outputting the power supply voltage to the lamp string when the black state voltage is provided to the output end of the lamp string. According to the technical scheme, the problem of screen flashing can be reduced.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a light emitting driving circuit and a display device.
Background
In the backlight (Back Light) of the display panel, more and more display products use Mini-LEDs (Mini Light Emitting Diode, micro Light emitting diodes) as backlight (Back Light) for display. In the process of closing the display panel, the current of each light string may be different due to the environment or the process of the Mini-LED, so that the power failure of the whole display panel is inconsistent, part of the display panel is in a black state, and part of the display panel is brighter, thereby the problem of screen flashing is formed.
The above information disclosed in the background section is only for enhancement of understanding primarily for reducing the background of the application and thus it may include information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
An object of the present application is to provide a light-emitting driving circuit and a display device capable of reducing the occurrence of a splash-screen problem.
According to an aspect of the present application, the present application provides a light-emitting driving circuit, the light-emitting driving circuit includes power module and light string group, the light string group includes the light string, power module's output is connected the input of light string, power module is used for to the light string output power supply voltage, the light string group still includes:
the first end of the first response switch is connected with the output end of the light string, the second end of the first response switch is connected with a first power line for providing black state voltage, the control end of the first response switch is connected with a first signal line for providing a first control signal, and the control end of the first response switch responds to the first control signal and provides the black state voltage to the output end of the light string;
the power supply module responds to a second control signal, and stops outputting the power supply voltage to the lamp string when the black state voltage is provided to the output end of the lamp string.
In one aspect, the light emission driving circuit further includes:
the first signal input end of the first voltage comparator is connected with the power supply module, the second signal input end of the first voltage comparator is connected with a second power line for providing trigger voltage, and the signal output end of the first voltage comparator is connected with the control end of the power supply module;
the power supply voltage is lower than the trigger voltage, and the first voltage comparator outputs the second control signal.
In one aspect, the power supply module includes a second response switch, a first end of the second response switch is connected to a power supply end, an output end of the power supply module is a second end of the second response switch, a second end of the second response switch is connected to an input end of the light string, a control end of the second response switch is connected to a second signal line for providing the second control signal, and a control end of the second response switch is responsive to the second control signal to disconnect the first end and the second end of the second response switch.
In one aspect, the control end of the first response switch is connected with the signal output end of the first voltage comparator, the control end of the second response switch is connected with the signal output end of the first voltage comparator, the first signal line and the second signal line are connected with the same signal line, one of the first response switch and the second response switch is an N-type field effect transistor, and the other is a P-type field effect transistor.
In one aspect, the power supply module further comprises: the storage capacitor comprises a storage capacitor and a third response switch, wherein the first end of the storage capacitor is connected with the first end of the second response switch, the second end of the storage capacitor is connected with the second end of the third response switch, the first end of the third response switch is connected with the power supply end, and the control end of the third response switch is connected with a third signal line for providing a third control signal so as to provide the voltage of the power supply end to the first end of the storage capacitor.
In one aspect, the power supply module further comprises:
a fourth response switch, wherein a first end of the fourth response switch is connected with the power supply end, a second end of the fourth response switch is connected with the first end of the storage capacitor, a control end of the fourth response switch is connected with a fourth signal line for providing a fourth control signal, and the control end responds to the fourth control signal to provide the voltage of the power supply end to the first end of the storage capacitor;
and a fifth response switch, wherein a first end of the fifth response switch is connected with a second end of the storage capacitor, a second end of the fifth response switch is grounded, a control end of the fifth response switch is connected with a fifth signal line for providing a fifth control signal, and the control end is used for responding to the fifth control signal to ground the second end of the storage capacitor.
In one aspect, the light emission driving circuit includes:
the first signal input end of the second voltage comparator is connected with the second end of the second response switch, and the second signal input end of the second voltage comparator is connected with a third power line for providing target voltage;
the input end of the trigger is connected with the signal output end of the second voltage comparator, the output end of the trigger is respectively connected with the control end of the fourth response switch and the control end of the fifth response switch, so that when the power supply voltage is lower than the target voltage, the fourth response switch and the fifth response switch are controlled to be conducted, and the power supply end charges the storage capacitor.
In one aspect, the trigger is an SR trigger, an S input end and an R input end of the SR trigger are both connected to a signal output end of the second voltage comparator, and a Q output end of the SR trigger is respectively connected to a control end of the fourth response switch and a control end of the fifth response switch;
the light-emitting driving circuit further comprises an inverter, wherein the input end of the inverter is connected with the S input end, and the output end of the inverter is connected with the R input end.
In one aspect, the light string groups are provided with a plurality of groups, and the plurality of groups of light string groups are connected in parallel.
In order to solve the above-mentioned problem, according to an aspect of the present application, there is further provided a display device, the display device further includes a light-emitting driving circuit as described above, the driver is connected to the first response switch and the power supply module, the driver is configured to drive the first response switch to be turned on or turned off, and the driver is further configured to drive the power supply module to output a power supply voltage to the light string.
In the technical scheme of the application, after the first response switch receives the first control signal, the first response switch is conducted, and a black state voltage is formed at the output end of the light string. After receiving the second control signal, the power supply module stops outputting the power supply voltage. Therefore, under the condition that the input end of the light string does not continuously provide voltage, the output end of the light string is connected with black state voltage with uniform size, and the same size of the electric signals in the light string is ensured. Under the influence of the same black state voltage, the brightness of the light string is uniform, and black and white intervals cannot occur, so that the occurrence of the condition of screen flashing is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a circuit connection schematic diagram of a light-emitting driving circuit of a first embodiment in the present application.
Fig. 2 is a schematic diagram of circuit connection of the storage capacitor in fig. 1 during charging.
Fig. 3 is a schematic diagram of circuit connection of the storage capacitor of fig. 1 when discharging.
Fig. 4 is a schematic diagram of circuit connection at the shutdown stage of fig. 1 of the present application.
Fig. 5 is a schematic view of a connection structure in a display device according to a second embodiment of the present application.
The reference numerals are explained as follows:
1. a display device; 2. a light-emitting drive circuit; 3. a driver;
10. a power supply module; 20. a light string group; 30. a first voltage comparator; 40. a second voltage comparator;
110. a power supply end; 210. a light string; 510. a first power line; 520. a second power line; 530. a third power line; 610. a first signal line; 620. a second signal line; 630. a third signal line; 640. a fourth signal line; 650. a fifth signal line;
s1, a first response switch; v1, a power supply voltage; v2, black state voltage; v3, triggering voltage; v4, target voltage; C. a storage capacitor; t1, a second response switch; t2, a third response switch; t3, a fourth response switch; t4, a fifth response switch; F. an inverter.
Detailed Description
While this application is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the application and is not intended to limit the application to that as illustrated herein.
Thus, reference to one feature indicated in this specification will be used to describe one of the features of an embodiment of the application, and not to imply that each embodiment of the application must have the described feature. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.
In the embodiments shown in the drawings, indications of orientation (such as up, down, left, right, front and rear) are used to explain the structure and movement of the various elements of the present application are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the position of these elements changes, the indication of these directions changes accordingly.
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted.
Preferred embodiments of the present application are further elaborated below in conjunction with the drawings of the present specification.
Example 1
Referring to fig. 1, the present embodiment provides a light-emitting driving circuit, where the light-emitting driving circuit in the present embodiment uses Mini-LEDs (Mini Light Emitting Diode, micro light-emitting diodes), and the Mini-LEDs use direct type, small-pitch lamp beads to implement regional dimming in a smaller range through a large number of dense distributions, and compared with the conventional backlight design, the light-emitting driving circuit can have better brightness uniformity and higher color contrast in a smaller light mixing distance, can implement ultrathin design of terminal products, and saves electric energy.
In addition, the Light-Emitting driving circuit of the present embodiment can also be applied to an OLED (Organic Light-Emitting Diode) or a Micro-LED (Micro Light Emitting Diode, micro Light-Emitting Diode).
The light-emitting driving circuit comprises a power supply module 10 and a light string group 20, wherein the light string group 20 comprises a light string 210, and the light string 210 comprises a plurality of light beads which are sequentially connected in series. The output end of the power supply module 10 is connected to the input end of the light string 210, the power supply module 10 is configured to output a power supply voltage V1 to the light string 210, and the light string set 20 further includes: the first end of the first response switch S1 is connected to the output end of the light string 210, the second end of the first response switch S1 is connected to the first power line 510 for providing the black state voltage V2, the control end of the first response switch S1 is connected to the first signal line 610 for providing the first control signal, and the control end of the first response switch S1 is responsive to the first control signal to provide the black state voltage V2 to the output end of the light string 210. After the control end of the first response switch S1 receives the first control signal, the first end and the second end of the first response switch S1 are turned on, and the black voltage V2 is directly output to the output end of the light string 210.
The value of the black voltage V2 is generally smaller than the driving voltage for lighting the light string 210, and the black voltage V2 may not be zero. The purpose of the output terminal of the light string 210 being connected to the black voltage V2 is to unify the magnitudes of the electrical signals in the light string 210 into one. The voltage received by each lamp bead in the light string 210 is guaranteed to be the same, so that each lamp bead is guaranteed to be displayed in a uniform black state.
The power supply module 10 stops outputting the power supply voltage V1 to the light string 210 when the black state voltage V2 is supplied to the output terminal of the light string 210 in response to the second control signal. The input end of the light string 210 is disconnected while the light string 210 is connected with the black state voltage V2, so that the input voltage is prevented from affecting the black state display of the light string 210. In this embodiment, the input end of the light string 210 is the cathode of the light emitting diode, and the output end of the light string 210 is the anode of the light emitting diode.
In the technical solution of this embodiment, after the first response switch S1 receives the first control signal, the first response switch S1 is turned on, and a black voltage V2 is formed at the output end of the light string 210. After the power supply module 10 receives the second control signal, the power supply module 10 stops outputting the power supply voltage V1. In this way, under the condition that the input end of the light string 210 is not continuously supplied with voltage, a black state voltage V2 with a uniform magnitude is connected to the output end of the light string 210, so as to ensure that the electrical signals in the light string 210 are the same. Under the influence of the same black state voltage V2, the brightness of the light string 210 is uniform, and no black-white interval occurs, so that the occurrence of the condition of screen flash is reduced.
Meanwhile, the shutdown voltage of the light string 210 is pulled down by the uniform black voltage V2, so that other unknown voltages are prevented from affecting the shutdown picture. For example, during shutdown, a parasitic capacitor may exist in the power supply module 10, and the parasitic capacitor may discharge to generate an unknown voltage, thereby affecting the shutdown screen. By turning off the second response switch T1, the unknown voltage of the parasitic capacitance can be prevented from affecting the light string 210.
In order to disconnect the power module 10 from the input of the light string 210 in time, the transmission of the electrical signal to the light string 210 is stopped. The light-emitting drive circuit further includes: the first signal input end of the first voltage comparator 30 is connected to the power supply module 10, the second signal input end of the first voltage comparator 30 is connected to the second power line 520 for providing the trigger voltage V3, and the signal output end of the first voltage comparator 30 is connected to the control end of the power supply module 10; the supply voltage V1 is lower than the trigger voltage V3, and the first voltage comparator 30 outputs a second control signal. The first signal input end of the first voltage comparator 30 refers to an input negative electrode of the first voltage comparator 30, and the second signal input end of the first voltage comparator 30 refers to an input positive electrode of the first voltage comparator 30.
The supply voltage V1 and the trigger voltage V3 are compared by the first voltage comparator 30, and if the supply voltage V1 is less than or equal to the trigger voltage V3, it is indicated that the operation of stopping the light emission of the lamp string 210 has been performed. At this time, the first voltage comparator 30 outputs the second control signal by comparison, and the connection between the power supply module 10 and the input terminal of the light string 210 is disconnected under the action of the second control signal, so that the power supply module 10 stops supplying power to the light string 210.
Further, the power supply module 10 includes a second response switch T1, a first end of the second response switch T1 is connected to the power supply terminal 110, and the power supply terminal 110 is used for providing power for driving the light string 210 to light. The output end of the power supply module 10 is a second end of a second response switch T1, the second end of the second response switch T1 is connected to the input end of the light string 210, the control end of the second response switch T1 is connected to a second signal line 620 for providing a second control signal, and the control end of the second response switch T1 is responsive to the second control signal to disconnect the first end and the second end of the second response switch T1. One end of the power supply module 10 is connected to a driver, a control chip is disposed in the driver, and the circuit reserved in the light string 210 can be prevented from reversely flowing into the power supply module 10 through the disconnection of the second response switch T1, so that the influence on the control chip is reduced, and the control chip is protected.
In addition, by turning off the second response switch T1, the power supply module 10 is prevented from malfunction, so that a large current flows to the light string 210, and the light string is damaged, and other currents are prevented from affecting the shutdown screen. For example, when the power supply module 10 is turned off, parasitic capacitance may exist in the MOS transistor, and the parasitic capacitance discharge may affect the light string 210, and by turning off the second response switch T1, the parasitic capacitance discharge may be prevented from affecting the light string 210.
In order to simplify the circuit structure, the control terminal of the first response switch S1 is connected to the signal output terminal of the first voltage comparator 30, the control terminal of the second response switch T1 is connected to the signal output terminal of the first voltage comparator 30, the first signal line 610 and the second signal line 620 are connected to the same signal line, and the first control signal and the second control signal are the same control signal. The first voltage comparator 30 thus completes the control of the first response switch S1 and the second response switch T1 at the same time. The control of the two responsive switches can be accomplished by one control element, thereby simplifying the circuit configuration.
It should be noted that, after the first response switch S1 receives the first control signal, it is turned on, and the second response switch T1 receives the second control signal, it is turned off. The opposite operation is performed when both receive the same signal. For this purpose, one of the first response switch S1 and the second response switch T1 is an N-type field effect transistor, and the other is a P-type field effect transistor. The field effect transistor is a MOS transistor, which is an abbreviation of MOSFET. MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) Metal-Oxide-semiconductor field effect transistor, referred to as Metal-Oxide-semiconductor field effect transistor. The MOS tube has the advantages of small switching loss, quick switching action and the like.
Typically, the first terminal of the responsive switch is referred to as the source, the second terminal is referred to as the drain, and the control terminal is referred to as the gate. Alternatively, the first end of the responsive switch may be referred to as the drain and the second end as the source.
For example, the output of the first voltage comparator 30 is high, the first response switch S1 is a P-type field effect transistor, and the second response switch T1 is an N-type field effect transistor.
If the output of the first voltage comparator 30 is low, the first response switch S1 is an N-type fet, and the second response switch T1 is a P-type fet.
Of course, the first response switch S1 and the second response switch T1 may be connected to different control elements for more flexible control.
To better complete the lighting start of the light string 210, the power module 10 further includes: the storage capacitor C and the third response switch T2, the first end of the storage capacitor C is connected with the first end of the second response switch T1, the second end of the storage capacitor C is connected with the second end of the third response switch T2, the first end of the third response switch T2 is connected with the power supply end 110, and the control end of the third response switch T2 is connected with the third signal line 630 for providing a third control signal so as to provide the voltage of the power supply end 110 to the first end of the storage capacitor C.
A part of the electric quantity is stored in the storage capacitor C, and when the power supply voltage V1 is output to the light string 210, the power supply voltage V1 is the electric quantity of the storage capacitor C added to the output voltage of the power supply terminal 110, so that the light string 210 can obtain a larger voltage, and can be smoothly lightened. That is, in the case of starting the light string 210, the voltage for starting the light string 210 is boosted by the storage capacitor C, so that the light string 210 is more preferably started.
In order to smoothly complete the charging of the storage capacitor C before the driving light string 210 is turned on, the power supply module 10 further includes: a fourth responsive switch T3 and a fifth responsive switch T4.
The first end of the fourth response switch T3 is connected to the power supply end 110, the second end is connected to the first end of the storage capacitor C, the control end is connected to the fourth signal line 640 for providing a fourth control signal, and the control end responds to the fourth control signal to provide the voltage of the power supply end 110 to the first end of the storage capacitor C; the first end and the second end of the fourth response switch T3 are turned on under the action of the fourth control signal, so that the power supply end 110 is connected with the first end of the storage capacitor C.
The first terminal of the fifth response switch T4 is connected to the second terminal of the storage capacitor C, the second terminal of the fifth response switch T4 is grounded, the control terminal is connected to the fifth signal line 650 for providing a fifth control signal, and the control terminal is used for responding to the fifth control signal to ground the second terminal of the storage capacitor C. The first end and the second end of the fifth response switch T4 are conducted under the action of a fifth control signal, and the second end of the storage voltage is grounded.
In this way, when both the fourth responsive switch T3 and the fifth responsive switch T4 are turned on, the power supply terminal 110 starts charging the storage capacitor C. After the charging is completed, the fourth response switch T3 and the fifth response switch T4 are turned off, the second response switch T1 and the third response switch T2 are turned on, the storage capacitor C starts to discharge, and the driving of the light string 210 is turned on.
In order to ensure that the voltage obtained by the light string 210 is sufficiently large when the light string 210 is driven to be lighted, it is necessary that the storage capacitor C obtains a sufficient amount of electricity. To this end, the light emission driving circuit includes: a second voltage comparator 40 and a flip-flop. When the power supply voltage V1 is low, the second voltage comparator 40 and the flip-flop charge the storage capacitor C again, thereby increasing the power supply voltage V1.
The first signal input end of the second voltage comparator 40 is connected to the second end of the second response switch T1, and the second signal input end of the second voltage comparator 40 is connected to the third power line 530 for providing the target voltage V4; the target voltage V4 is a voltage for driving the light string 210 to light, and the power supply voltage V1 is generally required to be at least equal to the target voltage V4, and the target voltage V4 can be set according to the number of the light bulbs in the light string 210. The first signal input end of the second voltage comparator 40 refers to an input negative electrode of the second voltage comparator 40, and the second signal input end of the second voltage comparator 40 refers to an input positive electrode of the second voltage comparator 40.
The input end of the trigger is connected to the signal output end of the second voltage comparator 40, and the output end of the trigger is respectively connected to the control end of the fourth response switch T3 and the control end of the fifth response switch T4, so as to control the fourth response switch T3 and the fifth response switch T4 to be turned on when the supply voltage V1 is lower than the target voltage V4, and the supply end 110 charges the storage capacitor C. If the second voltage comparator 40 compares the received supply voltage V1 with the target voltage V4, the second voltage comparator 40 outputs a fourth control signal and a fifth control signal when the supply voltage V1 is lower than the target voltage V4, wherein the fourth signal line 640 and the fifth signal line 650 are connected to the same signal line, and the fourth control signal and the fifth control signal are the same control signal.
When the supply voltage V1 is lower than the target voltage V4, it is indicated that the supply voltage V1 is lower and the lamp string 210 cannot be driven to light. For this reason, the fourth response switch T3 and the fifth response switch T4 are turned on to charge the storage capacitor C, and the charging time can be set as needed. If the supply voltage V1 is still smaller than the target voltage V4 after the charging is completed, the fourth response switch T3 and the fifth response switch T4 are continuously turned on to continuously charge the storage capacitor C until the supply voltage V1 is equal to the target voltage V4.
Further, in order to smoothly complete the charging of the storage capacitor C, the supply voltage V1 is ensured to be equal to the target voltage V4. The trigger is an SR trigger, the S input end and the R input end of the SR trigger are both connected with the signal output end of the second voltage comparator 40, and the Q output end of the SR trigger is respectively connected with the control end of the fourth response switch T3 and the control end of the fifth response switch T4; the light-emitting driving circuit further comprises an inverter F, wherein the input end of the inverter F is connected with the S input end, and the output end of the inverter F is connected with the R input end. The signal of the second voltage comparator 40 is inputted to the R input terminal after the action of the inverter F.
The clock port CLK of the SR flip-flop is connected to a clock signal line, and the SR flip-flop performs a trigger function when a 1 signal representing a high level is input to the clock signal line. When the supply voltage V1 is smaller than the target voltage V4, the signal output terminal of the second voltage comparator 40 outputs 1 representing a high level. Thus, the S input is 1 and the R input is 0 due to the action of the inverter F. According to the operating principle of the SR flip-flop, the Q output outputs a 1 representing a high level. The fourth response switch T3 and the fifth response switch T4 are turned on under the high level action of the Q output terminal. The SR flip-flop further includes a Q output terminal, and in this embodiment, the fourth response switch T3 and the fifth response switch T4 are only connected to the Q output terminal.
Wherein, the lamp string groups 20 are provided with a plurality of groups, and the lamp string groups 20 of the plurality of groups are connected in parallel. The input end of each light string group 20 is connected with the power supply module 10, and the output end of each light string group 20 is connected with the first power line 510 of the black state voltage V2. When the display is turned off, all of the lamp strings 20 all display the same black state voltage V2.
In the scheme of the present application, the driving lighting of the light string 210 may be divided into four phases.
Referring to fig. 2, in the first stage, the storage capacitor C is charged, the first response switch S1, the second response switch T1 and the third response switch T2 are all turned off, and the fourth response switch T3 and the fifth response switch T4 are all turned on, so as to charge the storage capacitor C.
Referring to fig. 3, in the second stage, the storage capacitor C discharges, the first response switch S1, the fourth response switch T3 and the fifth response switch T4 are all turned off, the second response switch T1 and the third response switch T2 are all turned on, and the supply voltage V1 is superimposed on the voltage of the supply terminal 110 based on the storage voltage of the storage capacitor C.
In the third stage, in the operation voltage stabilizing stage, the first response switch S1, the second response switch T1 and the third response switch T2 are all turned off, when the supply voltage V1 is smaller than the target voltage V4, the second voltage comparator 40 and the SR flip-flop intervene to operate, and the fourth response switch T3 and the fifth response switch T4 are all turned on, so that the storage capacitor C is charged again until the supply voltage V1 is equal to the target voltage V4. The storage capacitor C is charged in the operation voltage stabilizing stage, and reference may also be made to fig. 2.
Referring to fig. 4, in the fourth stage, in the shutdown stage, the supply voltage V1 is lower than the trigger voltage V3, the first voltage comparator 30 is triggered to start working, the first voltage comparator 30 outputs a low level, the first response switch S1 is turned on, the output terminal of the light string 210 is connected to the black voltage V2, and the second response switch T1 is turned off.
Wherein, when the first voltage comparator 30 triggers the operation, the second voltage comparator 40 stops the operation. In addition, in the present embodiment, the control ends of the second response switch T1, the third response switch T2, the fourth response switch T3, and the fifth response switch T4 may be connected to other scan lines, and when the first voltage comparator 30 and the second voltage comparator 40 are not operated, the other scan lines control the second response switch T1, the third response switch T2, the fourth response switch T3, and the fifth response switch T4 to be turned on or off, so that the storage capacitor C is charged in the first stage and the second stage. The third stage second voltage comparator 40 and the SR flip-flop intervene, and the fourth stage first voltage comparator 30 intervenes. The output of the string light 210 is also connected to other lines, so that the string light 210 and other lines may be connected to form a loop before the first response switch S1 and the first voltage comparator 30 are operated. Ensuring proper ignition of the light string 210.
Example two
Referring to fig. 5, the present application further provides a display device, which includes a light-emitting driving circuit 2, a driver 3 connected to the first response switch S1 and the power supply module 10, the driver 3 for driving the first response switch S1 to be turned on or off, and the driver 3 for driving the power supply module 10 to output a power supply voltage V1 to the light string 210. Specifically, the driver 3 includes a first voltage comparator 30, and the driver 3 is further capable of adjusting the magnitude of the trigger voltage of the second signal input terminal of the first voltage comparator 30 to drive the first response switch S1 and the power supply module 10 to operate.
The light-emitting driving circuit comprises a power supply module 10 and a light string group 20, wherein the light string group 20 comprises a light string 210, and the light string 210 comprises a plurality of light beads which are sequentially connected in series. The output end of the power supply module 10 is connected to the input end of the light string 210, the power supply module 10 is configured to output a power supply voltage V1 to the light string 210, and the light string set 20 further includes: the first end of the first response switch S1 is connected to the output end of the light string 210, the second end of the first response switch S1 is connected to the first power line 510 for providing the black state voltage V2, the control end of the first response switch S1 is connected to the first signal line 610 for providing the first control signal, and the control end of the first response switch S1 is responsive to the first control signal to provide the black state voltage V2 to the output end of the light string 210. After the control end of the first response switch S1 receives the first control signal, the first end and the second end of the first response switch S1 are turned on, and the black voltage V2 is directly output to the output end of the light string 210.
The value of the black voltage V2 is generally smaller than the driving voltage for lighting the light string 210, and the black voltage V2 may not be zero. The purpose of the output terminal of the light string 210 being connected to the black voltage V2 is to unify the magnitudes of the electrical signals in the light string 210 into one. The voltage received by each lamp bead in the light string 210 is guaranteed to be the same, so that each lamp bead is guaranteed to be displayed in a uniform black state.
The power supply module 10 stops outputting the power supply voltage V1 to the light string 210 when the black state voltage V2 is supplied to the output terminal of the light string 210 in response to the second control signal. The input end of the light string 210 is disconnected while the light string 210 is connected with the black state voltage V2, so that the input voltage is prevented from affecting the black state display of the light string 210.
The embodiments of the display device of the present invention include all the technical solutions of all the embodiments of the light-emitting driving circuit, and the achieved technical effects are also completely the same, and are not described herein again.
While the present application has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration rather than of limitation. As the present application may be embodied in several forms without departing from the spirit or essential attributes thereof, it should be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalences of such metes and bounds are therefore intended to be embraced by the appended claims.
Claims (7)
1. The utility model provides a light-emitting drive circuit, light-emitting drive circuit includes power module and lamp cluster group, lamp cluster group includes the lamp cluster, power module's output is connected the input of lamp cluster, power module is used for to the lamp cluster output power supply voltage, its characterized in that, lamp cluster group still includes:
the first end of the first response switch is connected with the output end of the light string, the second end of the first response switch is connected with a first power line for providing black state voltage, the control end of the first response switch is connected with a first signal line for providing a first control signal, and the control end of the first response switch responds to the first control signal and provides the black state voltage to the output end of the light string;
the power supply module responds to a second control signal, and stops outputting the power supply voltage to the lamp string when the black state voltage is provided to the output end of the lamp string;
the light emission driving circuit further includes: the first signal input end of the first voltage comparator is connected with the power supply module, the second signal input end of the first voltage comparator is connected with a second power line for providing trigger voltage, and the signal output end of the first voltage comparator is connected with the control end of the power supply module; the power supply voltage is lower than the trigger voltage, and the first voltage comparator outputs the second control signal;
the power supply module comprises a second response switch, a first end of the second response switch is connected with a power supply end, an output end of the power supply module is a second end of the second response switch, a second end of the second response switch is connected with an input end of the light string, a control end of the second response switch is connected with a second signal line for providing the second control signal, and a control end of the second response switch responds to the second control signal to disconnect the first end and the second end of the second response switch;
the power supply module further includes: the storage capacitor comprises a storage capacitor and a third response switch, wherein the first end of the storage capacitor is connected with the first end of the second response switch, the second end of the storage capacitor is connected with the second end of the third response switch, the first end of the third response switch is connected with the power supply end, and the control end of the third response switch is connected with a third signal line for providing a third control signal so as to provide the voltage of the power supply end to the first end of the storage capacitor.
2. The light-emitting driving circuit according to claim 1, wherein a control end of the first response switch is connected to a signal output end of the first voltage comparator, a control end of the second response switch is connected to a signal output end of the first voltage comparator, the first signal line and the second signal line are connected to the same signal line, one of the first response switch and the second response switch is an N-type field effect transistor, and the other is a P-type field effect transistor.
3. The light-emitting driver circuit of claim 1, wherein the power supply module further comprises:
a fourth response switch, wherein a first end of the fourth response switch is connected with the power supply end, a second end of the fourth response switch is connected with the first end of the storage capacitor, a control end of the fourth response switch is connected with a fourth signal line for providing a fourth control signal, and the control end responds to the fourth control signal to provide the voltage of the power supply end to the first end of the storage capacitor;
and a fifth response switch, wherein a first end of the fifth response switch is connected with a second end of the storage capacitor, a second end of the fifth response switch is grounded, a control end of the fifth response switch is connected with a fifth signal line for providing a fifth control signal, and the control end is used for responding to the fifth control signal to ground the second end of the storage capacitor.
4. A light-emitting driver circuit according to claim 3, wherein the light-emitting driver circuit comprises:
the first signal input end of the second voltage comparator is connected with the second end of the second response switch, and the second signal input end of the second voltage comparator is connected with a third power line for providing target voltage;
the input end of the trigger is connected with the signal output end of the second voltage comparator, the output end of the trigger is respectively connected with the control end of the fourth response switch and the control end of the fifth response switch, so that when the power supply voltage is lower than the target voltage, the fourth response switch and the fifth response switch are controlled to be conducted, and the power supply end charges the storage capacitor.
5. The light-emitting driving circuit according to claim 4, wherein the flip-flop is an SR flip-flop, an S input terminal and an R input terminal of the SR flip-flop are both connected to the signal output terminal of the second voltage comparator, and a Q output terminal of the SR flip-flop is connected to the control terminal of the fourth response switch and the control terminal of the fifth response switch, respectively;
the light-emitting driving circuit further comprises an inverter, wherein the input end of the inverter is connected with the S input end, and the output end of the inverter is connected with the R input end.
6. The light-emitting driver circuit according to claim 1, wherein the lamp string groups are provided with a plurality of groups, and a plurality of groups of the lamp string groups are arranged in parallel.
7. A display device comprising a driver, wherein the display device further comprises a light-emitting driving circuit according to any one of claims 1 to 6, the driver is connected to the first response switch and the power supply module, the driver is configured to drive the first response switch to be turned on or off, and the driver is further configured to drive the power supply module to output a power supply voltage to the light string.
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| CN202210875995.0A CN115101006B (en) | 2022-07-22 | 2022-07-22 | Light-emitting driving circuit and display device |
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| JP3762197B2 (en) * | 1999-07-08 | 2006-04-05 | 日亜化学工業株式会社 | Display device |
| JP5071134B2 (en) * | 2008-02-05 | 2012-11-14 | ミツミ電機株式会社 | DC power supply, LED drive power supply, and power supply semiconductor integrated circuit |
| US9047810B2 (en) * | 2011-02-16 | 2015-06-02 | Sct Technology, Ltd. | Circuits for eliminating ghosting phenomena in display panel having light emitters |
| KR20120124840A (en) * | 2011-05-04 | 2012-11-14 | 삼성전자주식회사 | Light emitting diode driving apparatus and method for driving the same |
| CN102281683B (en) * | 2011-07-28 | 2014-03-12 | 林万炯 | LED anti-flash circuit |
| CN102665325B (en) * | 2012-04-12 | 2015-03-11 | 深圳市华星光电技术有限公司 | LED backlight drive circuit, backlight module and liquid crystal display device |
| CN103093729B (en) * | 2013-02-28 | 2015-07-29 | 深圳市华星光电技术有限公司 | There is the backlight drive circuit of two BOOST booster circuit |
| CN103177698B (en) * | 2013-03-27 | 2016-02-03 | 深圳市华星光电技术有限公司 | A kind of LED backlight drive circuit and backlight module |
| WO2015002957A1 (en) * | 2013-07-02 | 2015-01-08 | Derek Haynes | Systems and methods for power management in a beacom |
| US9674911B2 (en) * | 2015-07-23 | 2017-06-06 | Dialog Semiconductor Inc. | Arbitrary pulse alignment to reduce LED flicker |
| US10327295B2 (en) * | 2015-12-10 | 2019-06-18 | Osram Sylvania Inc. | Multi string controller with independent current setting for each string |
| CN205354617U (en) * | 2015-12-11 | 2016-06-29 | 深圳市绿源半导体技术有限公司 | LED display screen drive and control circuit |
| CN106782349B (en) * | 2017-01-04 | 2019-01-22 | 深圳市华星光电技术有限公司 | A kind of LED backlight drive circuit and liquid crystal display |
| KR20190032689A (en) * | 2017-09-18 | 2019-03-28 | 삼성디스플레이 주식회사 | Backlight unit capable of controlling brightness and display apparatus having the same |
| CN113192449B (en) * | 2021-04-16 | 2022-05-06 | 惠科股份有限公司 | Display panel driving circuit and driving method |
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