CN113689828B - Backlight driving circuit, display terminal and display driving method - Google Patents
Backlight driving circuit, display terminal and display driving method Download PDFInfo
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- CN113689828B CN113689828B CN202111008317.6A CN202111008317A CN113689828B CN 113689828 B CN113689828 B CN 113689828B CN 202111008317 A CN202111008317 A CN 202111008317A CN 113689828 B CN113689828 B CN 113689828B
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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
Abstract
The application relates to a backlight driving circuit, a display terminal and a display driving method, wherein the backlight driving circuit comprises a first switch component, a second switch component, an energy storage component, a driving component, a detection component, a light-emitting component and an interface component, wherein the first switch component is respectively and electrically connected with a scanning line, a data line and the driving component; the second switch assembly is electrically connected with the power line, the second control line and the driving assembly respectively; the energy storage assembly is electrically connected with the first switch assembly, the driving assembly and the detection assembly respectively to form an internal node together; the driving assembly is respectively electrically connected with the second switch assembly, the light-emitting assembly and the internal node; the detection assembly is electrically connected with the first control line, the internal node and the detection line respectively. This application is through setting up second switch module and determine module, can compensate first switch module's threshold voltage, promotes drive current's on the drive assembly stability, improves display panel's luminous quality, and occupation space is little, and is simple and convenient.
Description
Technical Field
The application relates to the technical field of display, in particular to a backlight driving circuit, a display terminal and a display driving method.
Background
The Micro LED (i.e., micro LED) display technology refers to a display technology in which self-luminous micron-scale LEDs are used as light-emitting pixel units, and are assembled on a driving panel to form a high-density LED array. Compared with the existing Liquid Crystal Display (LCD) technology and Organic Light-Emitting Diode (OLED) Display technology, the Display panel adopting the Micro LED Display technology has the advantages of fast response, high color gamut, high PPI, low energy consumption and the like. Therefore, the development of Micro LED display technology becomes one of the hot spots of future display technology. However, micro-LEDs have many technical difficulties and complex technology, and especially, the mass transfer technology of Micro-LEDs and the miniaturization of LED particles are technical bottlenecks.
The Mini LED (i.e. Mini LED) display technology is a product of combining the Micro LED display technology and a back plate, has the characteristics of high contrast, high color rendering performance and the like which are comparable with those of an OLED (organic light emitting diode), the cost of the Mini LED is slightly higher than that of the LCD, the Mini LED is only about six percent of that of the OLED, and the Mini LED is easier to implement compared with the Micro LED display technology and the OLED display technology, so the Mini LED display technology field also becomes a layout hotspot of various large panel manufacturers. In addition, the Mini LED display technology is combined with LED backlight, more miniature LED backlight lamp beads can be integrated, the LED backlight lamp beads are divided into more fine backlight partitions, and light emitting adjustment is carried out according to the divided backlight partitions.
However, as the specification of the backlight partition increases, the number of the backlight partitions increases, and Glass (Glass) is increasingly popular as the substrate of the Mini LED display. However, although the Glass process is highly precise, the light emitted from the display panel is attenuated due to the threshold voltage shift of the thin film transistor in the display panel, which affects the quality of the display panel product.
Disclosure of Invention
In view of this, the present application provides a backlight driving circuit, a display terminal and a display driving method, which can compensate for a threshold voltage of a first switch assembly in a display panel, improve accuracy of compensating for the threshold voltage of the first switch assembly, further improve stability of a driving current on a driving assembly, improve light emitting quality of the display panel, occupy a small space, do not increase a capacitance resistance device, and are simple and convenient.
According to an aspect of the present application, there is provided a backlight driving circuit, including a first switch component, a second switch component, an energy storage component, a driving component, a detection component, a light emitting component, and an interface component, the interface component including a power line, a data line, a scan line, a detection line, a first control line, and a second control line, wherein the first switch component is electrically connected to the scan line, the data line, and the driving component, respectively; the second switch assembly is electrically connected with the power line, the second control line and the driving assembly respectively; the energy storage assembly is electrically connected with the first switch assembly, the driving assembly and the detection assembly respectively to form an internal node together; the driving assembly is electrically connected with the second switch assembly, the light emitting assembly and the internal node respectively; the sensing assembly is electrically connected to the first control line, the internal node, and the sensing line, respectively.
Further, the first switch component includes a first transistor, the driving component includes a second transistor, the detection component includes a third transistor, the second switch component includes a fourth transistor, the fourth transistor is used for controlling the second transistor to be electrically connected with the power line, and the third transistor is used for controlling the detection line to detect the state of the internal node.
Further, a gate of the fourth transistor is electrically connected to the second control line, a drain of the fourth transistor is electrically connected to a drain of the second transistor, and a source of the fourth transistor is electrically connected to the power supply line.
Further, a gate of the third transistor is electrically connected to the first control line, a drain of the third transistor is electrically connected to the internal node, and a source of the third transistor is electrically connected to the detection line.
Further, the state of the internal node includes a voltage or a current of the internal node.
Further, the energy storage component comprises a capacitor, and one end of the capacitor is electrically connected with the gate of the second transistor, the drain of the first transistor and the drain of the third transistor respectively to form an internal node together.
Further, the anode of the light emitting element is electrically connected to the source of the second transistor.
Further, the gate of the first transistor is electrically connected to the scan line, and the source of the first transistor is electrically connected to the data line.
According to another aspect of the present application, there is provided a display terminal including a terminal body and the backlight driving circuit, the terminal body being connected with the backlight driving circuit.
According to another aspect of the present application, there is provided a display driving method for driving the backlight driving circuit, the display driving method including at least one display period, the one display period including: in the first stage, setting the voltage on the first control line as a first control voltage, and setting the voltage on the second control line as a second control voltage, wherein the voltage on the power line is a power supply voltage, the voltage on the scanning line is a first scanning voltage, and the voltage on the data line is a first data voltage; in the second stage, setting the voltage on the scanning line as a second scanning voltage, setting the voltage on the data line as a second data voltage, simultaneously setting the voltage on the first control line to be kept as a first control voltage, keeping the voltage on the second control line as a second control voltage, and keeping the voltage on the power line as a power supply voltage; a third stage, setting the voltage on the first control line as a third control voltage, setting the voltage on the data line as a third data voltage, and simultaneously setting the voltage on the scan line to be kept as a second scan voltage, the voltage on the second control line to be kept as a second control voltage, and the voltage on the power line to be kept as a power supply voltage; and a fourth stage of setting the voltage on the second control line as a fourth control voltage, setting the voltage on the data line as a first data voltage, setting the voltage on the scan line as a first scan voltage, setting the voltage on the first control line to be a third control voltage, and setting the voltage on the power line to be a power supply voltage.
Through set up second switch module and detection element in the outside increase of display panel, can utilize the second switch module and the threshold voltage of detection element compensation first switch module in the compensation display panel that set up according to each aspect of this application, improve the precision to the threshold voltage compensation of first switch module, and then promote the stability of the drive current on the drive assembly, improve display panel's luminous quality, and the mode occupation space that adopts external compensation is little, can not increase resistance to capacitance ware spare, and is simple and convenient.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a backlight driving circuit in the related art.
Fig. 2 shows a schematic diagram of a backlight driving circuit according to an embodiment of the present application.
Fig. 3 shows a schematic diagram of a display driving method according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be apparent that the described embodiments are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other suitable relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
The following disclosure provides many different embodiments or examples for implementing different features of the application. To simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Further, the present application may repeat reference numerals and/or reference letters in the various examples for simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or arrangements discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.
Fig. 1 shows a schematic diagram of a backlight driving circuit in the related art.
As shown in fig. 1, the backlight driving circuit in the related art mainly includes a switching tube T1, a driving tube T2, a capacitor C, and a light emitting diode LED.
Referring to fig. 1, the scan signal may be from a gate driver and the data signal may be from a source driver in the display panel. The switch tube T1 may adopt a Thin Film Transistor (TFT) for controlling the writing of data on the data line (i.e., data in fig. 1) onto the driving tube T2 through the scan line (i.e., scan in fig. 1); the driving Transistor T2 may be a Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) for receiving data transmitted from the data line and driving the light emitting diode to emit light according to the received data. The supply voltage VLED is used to assist in setting the drive tube T2 to operate in a suitable operating state (e.g., linear region).
Further, in fig. 1, the scan line scan is electrically connected to the gate of the switch transistor T1, and the data line data is electrically connected to the source or the drain of the switch transistor T1. The capacitor C may be used to store the energy at the gate of the driving transistor T2 to avoid the light emitting diode LED emitting light discontinuously due to the switching of the switching transistor T1. When the driving tube T2 works in the linear region, the current between the source and the drain of the driving tube T2 can enable the light emitting diode LED to emit light.
However, the switching transistor T1 in the related art employs a TFT, which is generally located in a pixel unit inside the display panel. Because the threshold voltage of the TFT has a drift problem, it may affect the instability of the driving current on the driving tube, and finally affect the stability of light emission of the light emitting diode, resulting in the problem of poor display uniformity of the display panel.
In view of the above, the present application provides a backlight driving circuit, which includes a first switch component, a second switch component, an energy storage component, a driving component, a detection component, a light emitting component, and an interface component, where the interface component includes a power line, a data line, a scan line, a detection line, a first control line, and a second control line, and the first switch component is electrically connected to the scan line, the data line, and the driving component, respectively; the second switch assembly is electrically connected with the power line, the second control line and the driving assembly respectively; the energy storage assembly is electrically connected with the first switch assembly, the driving assembly and the detection assembly respectively to form an internal node together; the driving assembly is electrically connected with the second switch assembly, the light emitting assembly and the internal node respectively; the sensing assembly is electrically connected to the first control line, the internal node, and the sensing line, respectively.
The second switch assembly and the detection assembly are additionally arranged outside the display panel, the threshold voltage of the first switch assembly in the display panel can be compensated by the second switch assembly and the detection assembly, the accuracy of threshold voltage compensation of the first switch assembly is improved, the stability of driving current on the driving assembly is further improved, the light-emitting quality of the display panel is improved, the occupied space of an external compensation mode is small, a capacitor resistance component cannot be added, and the display panel is simple and convenient.
Fig. 2 shows a schematic diagram of a backlight driving circuit according to an embodiment of the present application.
As shown in fig. 2, the backlight driving circuit 20 includes a first switching component, a second switching component, an energy storage component, a driving component, a detection component, a light emitting component, and an interface component, wherein the first switching component includes a first transistor T1, the driving component includes a second transistor T2, the detection component includes a third transistor T3, and the second switching component includes a fourth transistor T4. The interface components include power lines 23, data lines 22, scan lines 21, sense lines 25, first control lines 26, and second control lines 24. The fourth transistor is used for controlling the second transistor to be electrically connected with the power line, and the third transistor is used for controlling the detection line to detect the state of the internal node.
Wherein the first transistor, the second transistor, the third transistor, and the fourth transistor are each any one of a single crystal silicon thin film transistor, a low temperature polycrystalline silicon thin film transistor, or an oxide semiconductor thin film transistor. It is understood that the transistor may include N-type and P-type, and the present application is not limited to the type of transistor. Hereinafter, the present application will be described taking as an example that all transistors are N-type.
Further, the first switching component includes a first transistor T1, which may be a thin film transistor. The first transistor may be located in a pixel unit in the display panel. In the display panel, the first transistor may be provided in plurality, and the plurality of first transistors may be arranged in a row and column. It is to be understood that the present application is not limited to the specific location of the first transistor.
Further, the gate of the first transistor is electrically connected to the scan line, and the source of the first transistor is electrically connected to the data line. For example, when the voltage of the scan line is set to a high level, the first transistor may be in a turned-on state, and data on a data line may be written to the gate of the second transistor through the first transistor at this time.
It should be noted that the scan line can control the on or off of all the first transistors of one row. When the scan lines are scanned, the first transistors of each row may be scanned row by row, that is, data on the data lines corresponding to the first transistors of each row may be written in rows.
Further, the energy storage component comprises a capacitor, and one end of the capacitor is electrically connected with the gate of the second transistor, the drain of the first transistor and the drain of the third transistor respectively to form an internal node n together. The other end of the capacitor may be directly grounded, or may be connected to another terminal, which is not limited in this application.
The capacitor may be configured to maintain a voltage of the internal node when the first transistor is turned off, so as to keep a current flowing through the second transistor stable, thereby preventing the current flowing through the second transistor from being unstable due to the switching of the first transistor, and preventing the light emitting brightness of the light emitting device from being affected.
Further, the positive electrode of the light emitting component is electrically connected with the source electrode of the second transistor, and the light emitting component comprises a light emitting diode for a Mini-LED, a Micro-LED or an OLED. It is to be understood that the present application is not limited to the type or number of light emitting diodes.
Further, the driving component includes a second transistor T2, a gate of the second transistor is electrically connected to a drain of the first transistor and one end of the capacitor, respectively, a source of the second transistor may be electrically connected to the anode of the light emitting component, and a drain of the second transistor may be electrically connected to a drain of the fourth transistor.
Wherein the second transistor may operate in a linear region. When the second transistor operates in a linear region, the second transistor may be equivalent to a variable resistor. In fig. 2, when the fourth transistor is in an on state, a voltage on the power line causes a current to flow between the source and the drain of the second transistor, thereby driving the light emitting element to emit light. The current flowing between the source and the drain of the second transistor is different in magnitude, and the brightness of light emitted by the light emitting component can also be different.
It is noted that certain conditions are required to set the second transistor to operate in the linear region. For example, when the voltage Vgs2 between the gate and the source of the second transistor is greater than the threshold voltage Vth2 of the second transistor itself, and the voltage Vgd2 between the gate and the drain of the second transistor is greater than the threshold voltage Vth2 of the second transistor itself, the drain current Id2 of the second transistor and the voltage Vds2 between the drain and the source of the second transistor exhibit a quadratic function relationship. In fig. 2, a voltage Vds2 between the drain and the source of the second transistor may be a voltage set on the power supply line.
Further, a gate of the fourth transistor is electrically connected to the second control line, a drain of the fourth transistor is electrically connected to a drain of the second transistor, and a source of the fourth transistor is electrically connected to the power supply line.
According to the embodiment of the application, whether the voltage on the power line is loaded on the driving assembly or not can be controlled by arranging the second switch assembly comprising the fourth transistor, and the driving assembly is simple and convenient.
Further, a gate of the third transistor is electrically connected to the first control line, a drain of the third transistor is electrically connected to the internal node, and a source of the third transistor is electrically connected to the detection line.
Further, the sensing wire may be electrically connected with the sensing module. The detection module can be implemented by using an embedded system, and can be located inside the display panel or outside the display panel. For example, the detection module may include a processor and a sensor. The sensor can detect the voltage or the current of the internal node through the detection line and send the detected voltage or the detected current of the internal node into the processor for processing. The processor can adjust the setting of the backlight driving circuit according to the real-time state of the voltage or the current of the internal node, and the light emitting stability of a light emitting component in the backlight driving circuit is ensured.
Further, the state of the internal node includes a voltage or a current of the internal node. It is to be understood that the present application is not limited to the states of the internal nodes.
It is to be understood that the type or number of transistors in the first switch component, the second switch component, the driving component or the detecting component may not be limited, for example, two fourth transistors may be provided in the second switch component, and the second switch component may have a switching function as long as the second switch component has the switching function.
According to the embodiment of the application, by arranging the detection assembly, the voltage or the current of the internal node can be detected by utilizing the arranged detection assembly, the threshold voltage change of the first switch assembly is obtained according to the detected voltage or current, and the data on the data line is adjusted according to the threshold voltage change of the first switch assembly, so that the purpose of compensating the threshold voltage of the first switch assembly in the display panel is achieved, the accuracy of threshold voltage compensation of the first switch assembly is improved, the stability of the driving current on the driving assembly is improved, the light-emitting quality of the display panel is improved, the occupied space of the mode adopting external compensation is small, the capacitance resisting device cannot be increased, and the detection device is simple and convenient.
In addition, the added devices in the embodiment of the application can not include resistors and capacitors, the influence on load change is small, and the improvement of the light emitting stability of the display panel is facilitated.
The present application also provides a display driving method for driving the backlight driving circuit, the display driving method including at least one display period, the one display period including:
in the first stage, setting the voltage on the first control line as a first control voltage, and setting the voltage on the second control line as a second control voltage, wherein the voltage on the power line is a power supply voltage, the voltage on the scanning line is a first scanning voltage, and the voltage on the data line is a first data voltage;
in the second stage, setting the voltage on the scanning line as a second scanning voltage, setting the voltage on the data line as a second data voltage, simultaneously setting the voltage on the first control line to be kept as a first control voltage, keeping the voltage on the second control line as a second control voltage, and keeping the voltage on the power line as a power supply voltage;
a third stage, setting the voltage on the first control line as a third control voltage, setting the voltage on the data line as a third data voltage, and simultaneously setting the voltage on the scan line to be kept as a second scan voltage, setting the voltage on the second control line to be kept as a second control voltage, and keeping the voltage on the power line as a power supply voltage;
and a fourth stage of setting the voltage on the second control line as a fourth control voltage, setting the voltage on the data line as a first data voltage, setting the voltage on the scan line as a first scan voltage, setting the voltage on the first control line to be a third control voltage, and setting the voltage on the power line to be a power supply voltage.
Fig. 3 shows a schematic diagram of a display driving method according to an embodiment of the present application.
As shown in fig. 3, the display driving method is used to drive the backlight driving circuit to operate. Rb may be the first control line, sen may be the sense line, data may be the Data line, scan may be the Scan line, EM may be the second control line, vled may be the power line, and Vss may be a zero level of ground.
Further, in a first stage, the voltage on the first control line is set as a first control voltage, and the voltage on the second control line is set as a second control voltage, the voltage on the power line is a power voltage, the voltage on the scan line is a first scan voltage, and the voltage on the data line is a first data voltage.
In a first phase, also referred to as an initialization phase, the first control voltage may be a gate voltage that turns on the third transistor. At this time, the third transistor is in a turned-on state, and the sensing line may sense a voltage or a current of the internal node pair. The second control voltage may be a zero level, at which time the fourth transistor is in an off state. Although a voltage is applied to the power line, the light emitting element does not emit light because the fourth transistor is in an off state. Further, the first scan voltage and the first data voltage may be zero, that is, the first transistor is in an off state.
Further, in the second stage, the voltage on the scan line is set to be the second scan voltage, the voltage on the data line is set to be the second data voltage, and meanwhile, the voltage on the first control line is set to be maintained as the first control voltage, the voltage on the second control line is maintained as the second control voltage, and the voltage on the power line is maintained as the power supply voltage.
Wherein, in the second phase, the second scan voltage may be a gate voltage that puts the first transistor in a conducting state. At this time, the first transistor is in a conducting state, and a signal on the data line can be applied to the internal node. The second data voltage may be a second highest voltage to enable the backlight driving circuit to operate normally. The second data voltage may be preset. Since the third transistor is still in a turned-on state due to the second data voltage being applied to the internal node, the voltage detected on the sensing line may slowly rise.
For example, the second data voltage is a, the threshold voltage of the first transistor is Vth1, and the internal node may be continuously charged to a voltage (a-Vth 1). The sensing lines may sense a change in voltage or current of the internal node to obtain a parameter of threshold shift of the first transistor, and the parameter of threshold shift of the first transistor may be sent to a processor for processing, and the processor may compensate a signal on the data line according to the parameter of threshold shift of the first transistor to determine a compensated signal on the data line, and send the compensated signal to the second transistor. Further, the fourth transistor is in an off state.
Further, the voltage or the current flowing between the source and the drain of the second transistor can be detected, and the change condition of the threshold voltage of the second transistor can be obtained, so that the voltage on the data line can be determined according to the change condition of the threshold voltage of the second transistor, and the voltage or the current flowing between the source and the drain of the second transistor can be more stable.
Further, in a third stage, the voltage on the first control line is set to a third control voltage, the voltage on the data line is set to a third data voltage, while the voltage on the scan line is set to be maintained at a second scan voltage, the voltage on the second control line is maintained at a second control voltage, and the voltage on the power supply line is maintained at a power supply voltage.
Wherein, in the third stage, the third control voltage may be a zero level to turn off the third transistor. That is, the sensing line stops sensing the voltage or current of the internal node. The third data voltage may be a high level on the data line. At this time, since the first transistor is still in a conductive state, the high level on the data line is loaded to the internal node. Further, at this time, the second transistor is in an on state, and the fourth transistor is in an off state.
Further, in a fourth phase, the voltage on the second control line is set to a fourth control voltage, the voltage on the data line is a first data voltage, the voltage on the scan line is a first scan voltage, and the voltage on the first control line is set to be maintained at a third control voltage, and the voltage on the power line is maintained at the power voltage.
Wherein, in the fourth phase, the fourth control voltage may be a gate voltage that puts the fourth transistor in a conducting state. At this time, the fourth transistor is in a conducting state, the voltage on the power line can be applied to the drain of the second transistor, and a driving current is generated between the source and the drain of the second transistor to drive the light emitting component to emit light. Further, the first transistor and the third transistor may be in an off state.
The embodiment of the application obtains the change of the threshold voltage of the first transistor by detecting the voltage or the current of the internal node in the display panel, and adjusts the voltage loaded on the data line according to the change of the threshold voltage of the first transistor, so that the driving current of the light-emitting component is more stable, the luminous intensity of the light-emitting component is more stable, the luminous uniformity of the whole display panel is improved, and the optical quality of the display panel is improved.
The application also provides a display terminal, the display terminal comprises a terminal main body and the backlight driving circuit, and the terminal main body is connected with the backlight driving circuit.
To sum up, this application embodiment sets up second switch module and determine module through the outside increase at display panel, can compensate first switch module's threshold voltage, improves the precision to first switch module's threshold voltage compensation, and then promotes drive current's on the drive assembly stability, improves display panel's luminous quality, adopts the mode of outside compensation, and occupation space is little, can not increase and hinder a container spare, and is little to the load influence, and is simple and convenient.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The backlight driving circuit, the display terminal and the display driving method provided by the embodiment of the present application are described in detail above, and a specific example is applied in the description to explain the principle and the implementation of the present application, and the description of the above embodiment is only used to help understanding the technical scheme and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. A backlight driving circuit, comprising a first switch element, a second switch element, an energy storage element, a driving element, a detection element, a light emitting element, and an interface element including a power line, a data line, a scan line, a detection line, a first control line, and a second control line,
the first switch assembly is electrically connected with the scanning line, the data line and the driving assembly respectively;
the second switch assembly is electrically connected with the power line, the second control line and the driving assembly respectively, wherein: the second switch component comprises a fourth transistor, the grid electrode of the fourth transistor is electrically connected with the second control line, the voltage on the second control line is a second control voltage in the second stage, the voltage on the second control line is a second control voltage in the third stage, and the voltage on the second control line is a fourth control voltage in the fourth stage;
the energy storage assembly is electrically connected with the first switch assembly, the driving assembly and the detection assembly respectively to form an internal node together;
the driving assembly is electrically connected with the second switch assembly, the light emitting assembly and the internal node respectively;
the sensing assembly is electrically connected to the first control line, the internal node, and the sensing line, respectively.
2. The backlight driving circuit according to claim 1, wherein the first switch element comprises a first transistor, the driving element comprises a second transistor, the detection element comprises a third transistor, the fourth transistor is used for controlling the second transistor to be electrically connected to the power line, and the third transistor is used for controlling the detection line to detect the state of the internal node.
3. The backlight driving circuit according to claim 2, wherein a drain of the fourth transistor is electrically connected to a drain of the second transistor, and a source of the fourth transistor is electrically connected to the power supply line.
4. The backlight driving circuit according to claim 2, wherein a gate of the third transistor is electrically connected to the first control line, a drain of the third transistor is electrically connected to the internal node, and a source of the third transistor is electrically connected to the detection line.
5. The backlight driving circuit according to claim 2, wherein the state of the internal node comprises a voltage or a current of the internal node.
6. The backlight driving circuit according to claim 2, wherein the energy storage component comprises a capacitor, and one end of the capacitor is electrically connected to the gate of the second transistor, the drain of the first transistor, and the drain of the third transistor, respectively, to form an internal node.
7. The backlight driving circuit according to claim 2, wherein an anode of the light emitting element is electrically connected to a source of the second transistor.
8. The backlight driving circuit according to claim 2, wherein the gate of the first transistor is electrically connected to the scan line, and the source of the first transistor is electrically connected to the data line.
9. A display terminal, characterized in that the display terminal comprises a terminal body and a backlight driving circuit according to any one of claims 1 to 8, the terminal body being connected to the backlight driving circuit.
10. A display driving method for driving the backlight driving circuit according to any one of claims 1 to 8, the display driving method comprising at least one display period, the one display period comprising:
setting the voltage on the first control line as a first control voltage, and simultaneously setting the voltage on the second control line as a second control voltage, wherein the voltage on the power line is a power supply voltage, the voltage on the scanning line is a first scanning voltage, and the voltage on the data line is a first data voltage;
in a second stage, setting the voltage on the scanning line as a second scanning voltage, setting the voltage on the data line as a second data voltage, simultaneously setting the voltage on the first control line to be kept as a first control voltage, keeping the voltage on the second control line as a second control voltage, and keeping the voltage on the power line as a power supply voltage;
a third stage, setting the voltage on the first control line as a third control voltage, setting the voltage on the data line as a third data voltage, and simultaneously setting the voltage on the scan line to be kept as a second scan voltage, setting the voltage on the second control line to be kept as a second control voltage, and keeping the voltage on the power line as a power supply voltage;
and a fourth stage of setting the voltage on the second control line as a fourth control voltage, setting the voltage on the data line as a first data voltage, setting the voltage on the scan line as a first scan voltage, setting the voltage on the first control line to be a third control voltage, and setting the voltage on the power line to be a power supply voltage.
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