CN112216245A - Adjusting circuit and method for module backlight lamp bar of television - Google Patents

Adjusting circuit and method for module backlight lamp bar of television Download PDF

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Publication number
CN112216245A
CN112216245A CN202011073361.0A CN202011073361A CN112216245A CN 112216245 A CN112216245 A CN 112216245A CN 202011073361 A CN202011073361 A CN 202011073361A CN 112216245 A CN112216245 A CN 112216245A
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China
Prior art keywords
resistor
capacitor
adjusting
voltage
main control
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CN202011073361.0A
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Chinese (zh)
Inventor
胡向峰
李亚伟
盘桥富
杨寄桃
黄德强
袁博
鲍晓杰
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Shenzhen Skyworth RGB Electronics Co Ltd
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Shenzhen Skyworth RGB Electronics Co Ltd
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Priority to CN202011073361.0A priority Critical patent/CN112216245A/en
Publication of CN112216245A publication Critical patent/CN112216245A/en
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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
    • 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
    • G09G3/3413—Details of control of colour illumination sources

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The embodiment of the invention discloses a circuit and a method for adjusting a module backlight lamp bar of a television, wherein the circuit is connected with a television main control board, a signal input end and the module backlight lamp bar and comprises the following steps: the filter circuit is used for rectifying the first voltage input by the filter signal input end and outputting a second voltage and a third voltage, and the third voltage is provided for the television main control board; the boosting circuit is used for boosting the second voltage to a fourth voltage according to a first signal sent by the television main control panel and providing the fourth voltage for the module backlight lamp bar; and the adjusting circuit is used for adjusting the overvoltage protection point of the backlight lamp bar according to a second signal sent by the television main control board. The adjusting circuit of the backlight lamp bar of the television set, provided by the embodiment of the invention, realizes the adjusting function of adjusting the backlight lamp bar of the module through two paths of PMW signals, solves the problem of matching with the lamp bar current settings of different screen bodies, and realizes the overvoltage protection OVP function of adjusting the voltage of the lamp bar with different specifications through matching with software.

Description

Adjusting circuit and method for module backlight lamp bar of television
Technical Field
The embodiment of the invention relates to an LED television and a display technology, in particular to a circuit and a method for adjusting a module backlight lamp bar of a television.
Background
At present, the most main parameters of a backlight lamp bar of a module of an LED television and other liquid crystal display devices are a lamp bar current and a lamp bar voltage, wherein the lamp bar voltage needs to solve the problem of lamp bar damage caused by circuit abnormality by setting an overvoltage protection point (OVP). The traditional lamp bar current and lamp bar overvoltage protection (OVP) circuit is mainly realized by adjusting a hardware circuit matched with a constant current control chip, when the module screen bodies with different specifications are matched, the current setting resistor of the constant current control chip and the OVP circuit parameters of the light bar need to be manually adjusted, for the same size of screen body, the specifications of the module light bars of different manufacturers are different, which mainly shows that the current and the voltage of the module light bars are different, therefore, when the specification of the matched screen body is continuously increased, the circuit setting parameters of the light bar current are required to be adjusted and the overvoltage protection circuit parameters of the light bar are required to be changed so as to be matched with the specification of the module light bar, therefore, each time a screen is matched, a power supply bill of material (BOM) is required to be matched with the screen, therefore, the number of BOMs of the power supply is also sharply increased, which causes great inconvenience to production and after-sales, and the system management and maintenance are extremely complicated.
Disclosure of Invention
The invention provides an adjusting circuit and method of a module backlight lamp bar of a television, which are used for realizing the functions of adjusting the current of lamp bars with different specifications and the overvoltage protection OVP of the lamp bars by matching with software.
In a first aspect, an embodiment of the present invention provides an adjusting circuit for a module backlight light bar of a television, connected to a main control board of the television, a signal input terminal, and the module backlight light bar, including:
the filter circuit is connected with the signal input end and the television main control board and is used for rectifying and filtering a first voltage input by the signal input end and outputting a second voltage and a third voltage, and the third voltage is supplied to the television main control board;
the boosting circuit is connected with the filter circuit and the module backlight lamp bar and used for boosting the second voltage to a fourth voltage according to a first signal sent by the television main control board and providing the fourth voltage for the module backlight lamp bar;
and the adjusting circuit is connected with the television main control board and the module backlight lamp bar and is used for adjusting the overvoltage protection point of the backlight lamp bar according to a second signal sent by the television main control board.
Optionally, the filter circuit includes: a diode D10, a diode D20, a capacitor C10 and a capacitor C20, wherein the anode of the diode D10 is connected to the first output end of the signal input end, the cathode of the diode D10 is connected to the first end of the capacitor C10, and the second end of the capacitor C10 is grounded; the anode of the diode D20 is connected to the second output terminal of the signal input terminal, the cathode of the diode D20 is connected to the first terminal of the capacitor C20, and the second terminal of the capacitor C20 is grounded.
Optionally, the boost circuit includes: a capacitor C11, an inductor L10, a diode D11, a capacitor C12, a MOS transistor Q10, a resistor R10, a resistor R11, a resistor R12, a chip U10, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, and a capacitor C17, wherein a first end of the capacitor C11 is connected to the inductor L10, a second end of the capacitor C11 is grounded, a second end of the inductor L10 is connected to an anode of the diode D11, a cathode of the diode D11 is connected to a first end of the capacitor C12, and a second end of the capacitor C12 is grounded; the drain of the MOS transistor Q10 is connected to the second terminal of the inductor L10, the source of the MOS transistor Q10 is connected to the first terminal of the resistor R12, the second terminal of the resistor R12 is grounded, the gate of the MOS transistor Q10 is connected to the first terminal of the resistor R10, the second terminal of the resistor R10 is connected to the 15 th pin of the chip U10, the first terminal of the resistor R11 is connected to the source of the MOS transistor Q10, the second terminal of the resistor R11 is connected to the 12 th pin of the chip U10, the first terminal of the resistor R13 is connected to the filter circuit, the second terminal of the resistor R13 is connected to the first terminal of the resistor R14, the second terminal of the resistor R14 is connected to the first terminal of the capacitor C14, the first terminal of the capacitor C13 is connected to the chip U10, the second terminal of the capacitor C13 is grounded, the second terminal of the capacitor C14 is grounded to the 4 th pin of the chip U10, a first end of the resistor R15 is connected to the 5 th pin of the chip U10, a second end of the resistor R15 is grounded, a first end of the resistor R16 is connected to the 7 th pin of the chip U10, a second end of the resistor R16 is connected to the second end of the capacitor C14, a first end of the resistor R17 is connected to the chip U10, a second end of the resistor R17 is grounded, a first end of the resistor R18 is connected to the 9 th pin of the chip U10, a second end of the resistor R18 is connected to the first end of the capacitor C16, a second end of the capacitor C16 is grounded, a first end of the capacitor C15 is connected to the 9 th pin of the chip U10, a second end of the capacitor C15 is grounded, a first end of the capacitor C17 is connected to the 8 th pin of the chip U10, a second end of the capacitor C17 is grounded, a first end of the resistor R19 is connected to the 10 th pin of the chip U10, the second end of the resistor R19 is grounded, the first end of the resistor R20 is connected to the 3 rd pin of the chip U10, the second end of the resistor R20 is connected to the television main control board, the first end of the resistor R21 is connected to the 6 th pin of the chip U10, and the second end of the resistor R21 is connected to the television main control board.
Optionally, the adjusting circuit includes a first adjusting circuit and a second adjusting circuit, the first adjusting circuit is configured to adjust the overvoltage protection voltage of the backlight light bar according to a first adjusting signal in a second signal sent by the television main control board, and the second adjusting circuit adjusts the light bar current of the backlight light bar according to a second adjusting signal in the second signal sent by the television main control board.
Optionally, the first adjusting circuit is connected with the television main control board and the module backlight lamp bar, and the second adjusting circuit is connected with the television main control board and the module backlight lamp bar.
Optionally, the adjusting circuit includes: a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a capacitor C20, a capacitor C19, and a MOS transistor Q12, wherein a first end of the resistor R24 is connected to the backlight light bar of the module, a second end of the resistor R24 is connected to a first end of the capacitor C20, a second end of the capacitor C20 is grounded, a first end of the resistor R26 is connected to a second end of the resistor R24, a second end of the resistor R26 is connected to a first end of the resistor R25, a second end of the resistor R25 is connected to the tv main control board, a drain of the MOS transistor Q12 is connected to a second end of the resistor R26, a source of the MOS transistor Q12 is grounded, a gate of the MOS transistor Q12 is connected to a first end of the capacitor C9, a second end of the capacitor C19 is grounded, a first end of the resistor R27 is connected to a gate of the MOS transistor Q12, a second end of the resistor R27 is connected to the tv main control board, the first end of the resistor R28 is connected to the gate of the MOS transistor Q12, and the second end of the resistor R28 is grounded.
Optionally, the method further includes: and the overvoltage protection circuit is connected between the booster circuit and the module backlight lamp bar and is used for setting an initial overvoltage protection value to protect the module backlight lamp bar.
Optionally, the overvoltage protection circuit includes: the backlight module comprises a resistor R22, a resistor R23 and a capacitor C18, wherein a first end of the resistor R22 is connected to the backlight light bar of the module, a second end of the resistor R22 is connected to a first end of the resistor R23, a second end of the resistor R23 is grounded, a first end of the capacitor C18 is connected to a second end of the resistor R22, and a second end of the capacitor C18 is grounded.
In a second aspect, an embodiment of the present invention further provides a method for adjusting a backlight bar of a television set module, where the method includes:
acquiring a first signal and a second signal of a television main control board;
adjusting the lamp strip current of the module backlight lamp strip according to the duty ratio of the first signal;
and adjusting the overvoltage protection voltage of the backlight lamp bar of the module according to the duty ratio of the second signal.
Optionally, the adjusting the lamp strip current of the backlight lamp strip of the module according to the duty ratio of the first signal includes:
determining whether a duty cycle of the first signal is equal to a first percentage;
if so, adjusting the backlight brightness of the module backlight lamp bar according to the duty ratio so as to adjust the lamp bar current of the module backlight lamp bar.
Optionally, the method further includes:
if not, acquiring the current duty ratio of the first signal;
and adjusting the backlight brightness of the module backlight lamp bar according to the current duty ratio so as to adjust the lamp bar current of the module backlight lamp bar.
Optionally, the adjusting the overvoltage protection voltage of the module backlight lamp bar according to the duty ratio of the second signal includes:
acquiring a plurality of critical points according to the second signal;
matching one point of a plurality of critical points corresponding to the duty ratio of the second signal according to the duty ratio of the second signal;
and adjusting the overvoltage protection voltage of the module backlight lamp strip according to the matched voltage value of the critical point.
The embodiment discloses an adjusting circuit and method for a module backlight lamp bar of a television, wherein the circuit is connected with a television main control board, a signal input end and the module backlight lamp bar, and comprises the following steps: the filter circuit is connected with the signal input end and the television main control board and is used for rectifying and filtering a first voltage input by the signal input end and outputting a second voltage and a third voltage, and the third voltage is supplied to the television main control board; the boosting circuit is connected with the filter circuit and the module backlight lamp bar and used for boosting the second voltage to a fourth voltage according to a first signal sent by the television main control board and providing the fourth voltage for the module backlight lamp bar; and the adjusting circuit is connected with the television main control board and the module backlight lamp bar and is used for adjusting the overvoltage protection point of the backlight lamp bar according to a second signal sent by the television main control board. The adjusting circuit of the backlight lamp bar of the television set, provided by the embodiment of the invention, realizes the adjusting function of adjusting the backlight lamp bar of the module through two paths of PMW signals, solves the problem of matching with the lamp bar current settings of different screen bodies, and realizes the overvoltage protection OVP function of adjusting the voltage of the lamp bar with different specifications through matching with software.
Drawings
Fig. 1 is a block diagram of a circuit for adjusting a backlight bar of a television set according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an adjusting circuit of a backlight bar of a television set according to an embodiment of the present invention;
fig. 3 is a signal timing diagram of an adjusting circuit of a backlight bar of a television set according to an embodiment of the present invention;
fig. 4 is a module connection diagram of an adjusting circuit of a backlight bar of a television set according to a second embodiment of the present invention;
fig. 5 is a circuit diagram of an adjusting circuit of a backlight bar of a television set according to a second embodiment of the present invention;
fig. 6 is a flowchart of a method for adjusting a backlight bar of a television set module according to a third embodiment of the present invention;
fig. 7 is a flowchart of a method for adjusting a backlight bar of a television set according to another embodiment of the present invention;
fig. 8 is a flowchart of another method for adjusting a backlight bar of a television set according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the steps as a sequential process, many of the steps can be performed in parallel, concurrently or simultaneously. In addition, the order of the steps may be rearranged. A process may be terminated when its operations are completed, but may have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.
Furthermore, the terms "first," "second," and the like may be used herein to describe various orientations, actions, steps, elements, or the like, but the orientations, actions, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, the first audio may be referred to as the second audio, and similarly, the second audio may be referred to as the first audio, without departing from the scope of the present application. The first audio and the second audio are both audio, but they are not the same audio. The terms "first", "second", etc. are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Example one
Fig. 1 is a module connection diagram of an adjusting circuit of a module backlight light bar of a television according to an embodiment of the present invention, which is suitable for adjusting parameters of an overvoltage protection circuit of the module backlight light bar of the television, and specifically, the adjusting circuit of the module backlight light bar of the television is connected to a television main control board 4, a signal input terminal 5 and a module backlight light bar 6. The adjusting circuit of the module backlight lamp strip of this embodiment specifically includes: a filter circuit 1, a booster circuit 2 and a regulator circuit 3.
Referring to fig. 2, fig. 2 is a circuit diagram of an adjusting circuit of a backlight bar of a television module according to an embodiment of the present invention, specifically, a filter circuit 1 is connected to the signal input terminal 5 and the television main control board 4, and configured to rectify and filter a first voltage input by the signal input terminal 5 and output a second voltage and a third voltage, where the third voltage is provided to the television main control board 4. The filter circuit 1 includes: a diode D10, a diode D20, a capacitor C10 and a capacitor C20, wherein the anode of the diode D10 is connected to the first output end of the signal input end 5, the cathode of the diode D10 is connected to the first end of the capacitor C10, and the second end of the capacitor C10 is grounded; the anode of the diode D20 is connected to the second output terminal of the signal input terminal 5, the cathode of the diode D20 is connected to the first terminal of the capacitor C20, and the second terminal of the capacitor C20 is grounded.
In this embodiment, the filter circuit 1 is connected to the signal input terminal 5 and receives the first voltage, a winding of the filter circuit 1 is rectified and filtered by the diode D20 and the capacitor C20, and then outputs a third voltage to supply power to the tv main control board 4, and the third voltage is sent to the feedback circuit through the resistor R20, and the feedback circuit is connected to the AC-DC control chip to adjust the third voltage (generally +12V), thereby ensuring the stability of the output third voltage. On the other hand, the output third voltage supplies power to the constant current controller U10 through the resistor R21, and the normal power supply requirement of the constant current controller U10 is guaranteed. The other winding outputs a second voltage after being rectified and filtered by a diode D10 and a capacitor C10, and the second voltage provides input voltage for the booster circuit 2.
The boosting circuit 2 is connected with the filter circuit 1 and the module backlight lamp bar 6, and is used for boosting the second voltage to a fourth voltage according to the first signal sent by the television main control board 4 and providing the fourth voltage for the module backlight lamp bar 6. The booster circuit 2 includes: a capacitor C11, an inductor L10, a diode D11, a capacitor C12, a MOS transistor Q10, a resistor R10, a resistor R11, a resistor R12, a chip U10, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, and a capacitor C17, wherein a first end of the capacitor C11 is connected to the inductor L10, a second end of the capacitor C11 is grounded, a second end of the inductor L10 is connected to an anode of the diode D11, a cathode of the diode D11 is connected to a first end of the capacitor C12, and a second end of the capacitor C12 is grounded; the drain of the MOS transistor Q10 is connected to the second terminal of the inductor L10, the source of the MOS transistor Q10 is connected to the first terminal of the resistor R12, the second terminal of the resistor R12 is grounded, the gate of the MOS transistor Q10 is connected to the first terminal of the resistor R10, the second terminal of the resistor R10 is connected to the 15 th pin of the chip U10, the first terminal of the resistor R11 is connected to the source of the MOS transistor Q10, the second terminal of the resistor R11 is connected to the 12 th pin of the chip U10, the first terminal of the resistor R13 is connected to the filter circuit 1, the second terminal of the resistor R13 is connected to the first terminal of the resistor R14, the second terminal of the resistor R14 is connected to the first terminal of the capacitor C14, the first terminal of the capacitor C13 is connected to the chip U10, the second terminal of the capacitor C13 is grounded, the second terminal of the capacitor C14 is grounded to the 4 th pin of the chip U10, a first end of the resistor R15 is connected to the 5 th pin of the chip U10, a second end of the resistor R15 is grounded, a first end of the resistor R16 is connected to the 7 th pin of the chip U10, a second end of the resistor R16 is connected to the second end of the capacitor C14, a first end of the resistor R17 is connected to the chip U10, a second end of the resistor R17 is grounded, a first end of the resistor R18 is connected to the 9 th pin of the chip U10, a second end of the resistor R18 is connected to the first end of the capacitor C16, a second end of the capacitor C16 is grounded, a first end of the capacitor C15 is connected to the 9 th pin of the chip U10, a second end of the capacitor C15 is grounded, a first end of the capacitor C17 is connected to the 8 th pin of the chip U10, a second end of the capacitor C17 is grounded, a first end of the resistor R19 is connected to the 10 th pin of the chip U10, the second end of the resistor R19 is grounded, the first end of the resistor R20 is connected to the 3 rd pin of the chip U10, the second end of the resistor R20 is connected to the TV main control board 4, the first end of the resistor R21 is connected to the 6 th pin of the chip U10, and the second end of the resistor R21 is connected to the TV main control board 4.
In this embodiment, the boost circuit 2 is composed of a boost inductor L10, a MOS transistor Q10, a boost diode D11, a filter capacitor C12 and a constant current controller U10 after receiving the second voltage, in this embodiment, the first signal is an enable signal (ENA) and a PWM dimming signal (PWM1), when the television main control board 4 sends the enable signal (ENA) and the PWM dimming signal (PWM1), the VREF voltage is established, the boost circuit 2 starts to operate normally, and the voltage rises to the voltage (VLED +) required by the light bar (LED 1-LEDn).
The adjusting circuit 3 is connected with the television main control board 4 and the module backlight lamp bar 6 and is used for adjusting an overvoltage protection point of the backlight lamp bar according to a second signal sent by the television main control board 4. The adjusting circuit 3 includes: a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a capacitor C20, a capacitor C19, and a MOS transistor Q12, wherein a first end of the resistor R24 is connected to the module backlight light bar 6, a second end of the resistor R24 is connected to the first end of the capacitor C20, a second end of the capacitor C20 is grounded, a first end of the resistor R26 is connected to the second end of the resistor R24, a second end of the resistor R26 is connected to the first end of the resistor R25, a second end of the resistor R25 is connected to the tv main control board 4, a drain of the MOS transistor Q12 is connected to the second end of the resistor R26, a source of the MOS transistor Q637 is grounded, a gate of the MOS transistor Q12 is connected to the first end of the capacitor C9, a second end of the capacitor C9 is grounded, a first end of the resistor R9 is connected to the gate of the MOS transistor Q874, a second end of the tv main control board 9 is connected to the tv main control board 4, the first end of the resistor R28 is connected to the gate of the MOS transistor Q12, and the second end of the resistor R28 is grounded.
In this embodiment, the second signal is a PWM dimming signal (PWM2), when the tv main control board 4 sends a PWM2 signal, the PWM2 signal is output through a resistor R26 after passing through an inverter circuit composed of a resistor R27, a resistor R28, a capacitor C19, and a MOS transistor Q12, the resistor R25 is pulled up to VREF (a reference voltage of a constant current IC, generally 5.0V, and the voltage is different according to different schemes), the PWM2 passes through an RC filter circuit 1 composed of a capacitor C20 and a resistor R24, and is filtered into a direct current voltage and then sent to a sampling reference point of the constant current controller OVP through the resistor R24, and the OVP value of the light bar is adjusted by currents flowing into and out of the point, so that when Duty2 changes between 0% and 100%, a software adjustment function of a wide-range voltage is implemented, and thus, when the voltage of different backlight modules is matched, the setting of the OVP value is implemented by adjusting the Duty ratio of the light bar 2. Illustratively, the television main control board 4 takes an OZ9902D model as an example, the protection voltage is 3.0V, when the Duty ratio Duty2(0, a%) of the PWM2 is reached, the PWM2 is filtered into a dc voltage through a capacitor C20 and a resistor R24, and the dc voltage is sent to the sampling reference point of the OVP of the constant current controller U10 through a resistor R24, and since the dc voltage is greater than 3.0V, a current flows into the OVP reference point, the OVP voltage of the module backlight light bar 6 is smaller than an initial setting value. On the contrary, when the Duty ratio Duty2 (c%, 100%) of the PWM2 is set, the current flows out of the OVP reference point, and the OVP voltage of the backlight light bar 6 is greater than the initial setting value. When Duty2 is b%, the OVP voltage of the light bar is equal to the initial setting. In practical applications, the required OVP adjustment range can be achieved by initial parameter settings, in combination with PWM2 software.
In this embodiment, the power-on timing sequence of the PWM1, PWM2, ENA signals sent by the tv main control board 4 and the VREF voltage signal of the constant-current IC is as shown in fig. 3 below, after the system is turned on, the tv main control board 4 normally works to send a PWM1 signal (a dimming signal and a light bar current setting signal of different screens) and a PWM2 signal (a light bar voltage OVP adjusting signal), respectively, after t1 time, the tv main control board 4 sends a constant-current enable signal (ENA), and after t2 time inside the constant-current IC, the VREF voltage is established, so that the whole constant-current backlight system normally works. When the whole machine enters a standby state, the PWM1 and the PWM2 are powered off simultaneously, the ENA signal is turned off before the time t3 of the signals of the PWM1 and the PWM2, and the VREF voltage is turned off after the constant current IC detects that the ENA signal is turned off and the time t4 is passed, so that the whole constant current backlight system is turned off. The time sequence control system can effectively ensure the normal work and the closing of the constant current system, and avoid the abnormal phenomena of screen flashing, bright lines and the like of the startup and shutdown.
This embodiment discloses an adjusting circuit of module backlight lamp strip of TV set, this circuit is connected with TV set main control board, signal input part and module backlight lamp strip, includes: the filter circuit is connected with the signal input end and the television main control board and is used for rectifying and filtering a first voltage input by the signal input end and outputting a second voltage and a third voltage, and the third voltage is supplied to the television main control board; the boosting circuit is connected with the filter circuit and the module backlight lamp bar and used for boosting the second voltage to a fourth voltage according to a first signal sent by the television main control board and providing the fourth voltage for the module backlight lamp bar; and the adjusting circuit is connected with the television main control board and the module backlight lamp bar and is used for adjusting the overvoltage protection point of the backlight lamp bar according to a second signal sent by the television main control board. The adjusting circuit of the backlight lamp bar of the television set, provided by the embodiment of the invention, realizes the adjusting function of adjusting the backlight lamp bar of the module through two paths of PMW signals, solves the problem of matching with the lamp bar current settings of different screen bodies, and realizes the overvoltage protection OVP function of adjusting the voltage of the lamp bar with different specifications through matching with software.
Example two
Fig. 4 is a module connection diagram of an adjusting circuit of a module backlight lamp bar of a television according to a second embodiment of the present invention, in which other functional modules are added on the basis of the first embodiment, and this embodiment is suitable for adjusting parameters of an overvoltage protection circuit of the module backlight lamp bar of the television, and specifically, an adjusting circuit of a module backlight lamp bar of a television is connected to a television main control board 4, a signal input terminal 5, and a module backlight lamp bar 6, and specifically includes: the circuit comprises a filter circuit 1, a booster circuit 2, a regulating circuit 3 and an overvoltage protection circuit 7.
Referring to fig. 5, fig. 5 is a circuit diagram of an adjusting circuit of a backlight bar of a television module according to a second embodiment of the present invention, specifically, a filter circuit 1 is connected to the signal input terminal 5 and the television main control board 4, and configured to rectify and filter a first voltage input by the signal input terminal 5 and output a second voltage and a third voltage, where the third voltage is provided to the television main control board 4. The filter circuit 1 includes: a diode D10, a diode D20, a capacitor C10 and a capacitor C20, wherein the anode of the diode D10 is connected to the first output end of the signal input end 5, the cathode of the diode D10 is connected to the first end of the capacitor C10, and the second end of the capacitor C10 is grounded; the anode of the diode D20 is connected to the second output terminal of the signal input terminal 5, the cathode of the diode D20 is connected to the first terminal of the capacitor C20, and the second terminal of the capacitor C20 is grounded.
The boosting circuit 2 is connected with the filter circuit 1 and the module backlight lamp bar 6, and is used for boosting the second voltage to a fourth voltage according to the first signal sent by the television main control board 4 and providing the fourth voltage for the module backlight lamp bar 6. The booster circuit 2 includes: a capacitor C11, an inductor L10, a diode D11, a capacitor C12, a MOS transistor Q10, a resistor R10, a resistor R11, a resistor R12, a chip U10, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, and a capacitor C17, wherein a first end of the capacitor C11 is connected to the inductor L10, a second end of the capacitor C11 is grounded, a second end of the inductor L10 is connected to an anode of the diode D11, a cathode of the diode D11 is connected to a first end of the capacitor C12, and a second end of the capacitor C12 is grounded; the drain of the MOS transistor Q10 is connected to the second terminal of the inductor L10, the source of the MOS transistor Q10 is connected to the first terminal of the resistor R12, the second terminal of the resistor R12 is grounded, the gate of the MOS transistor Q10 is connected to the first terminal of the resistor R10, the second terminal of the resistor R10 is connected to the 15 th pin of the chip U10, the first terminal of the resistor R11 is connected to the source of the MOS transistor Q10, the second terminal of the resistor R11 is connected to the 12 th pin of the chip U10, the first terminal of the resistor R13 is connected to the filter circuit 1, the second terminal of the resistor R13 is connected to the first terminal of the resistor R14, the second terminal of the resistor R14 is connected to the first terminal of the capacitor C14, the first terminal of the capacitor C13 is connected to the chip U10, the second terminal of the capacitor C13 is grounded, the second terminal of the capacitor C14 is grounded to the 4 th pin of the chip U10, a first end of the resistor R15 is connected to the 5 th pin of the chip U10, a second end of the resistor R15 is grounded, a first end of the resistor R16 is connected to the 7 th pin of the chip U10, a second end of the resistor R16 is connected to the second end of the capacitor C14, a first end of the resistor R17 is connected to the chip U10, a second end of the resistor R17 is grounded, a first end of the resistor R18 is connected to the 9 th pin of the chip U10, a second end of the resistor R18 is connected to the first end of the capacitor C16, a second end of the capacitor C16 is grounded, a first end of the capacitor C15 is connected to the 9 th pin of the chip U10, a second end of the capacitor C15 is grounded, a first end of the capacitor C17 is connected to the 8 th pin of the chip U10, a second end of the capacitor C17 is grounded, a first end of the resistor R19 is connected to the 10 th pin of the chip U10, the second end of the resistor R19 is grounded, the first end of the resistor R20 is connected to the 3 rd pin of the chip U10, the second end of the resistor R20 is connected to the TV main control board 4, the first end of the resistor R21 is connected to the 6 th pin of the chip U10, and the second end of the resistor R21 is connected to the TV main control board 4.
The adjusting circuit 3 is connected with the television main control board 4 and the module backlight lamp bar 6 and is used for adjusting an overvoltage protection point of the backlight lamp bar according to a second signal sent by the television main control board 4. The adjusting circuit 3 includes: a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a capacitor C20, a capacitor C19, and a MOS transistor Q12, wherein a first end of the resistor R24 is connected to the module backlight light bar 6, a second end of the resistor R24 is connected to the first end of the capacitor C20, a second end of the capacitor C20 is grounded, a first end of the resistor R26 is connected to the second end of the resistor R24, a second end of the resistor R26 is connected to the first end of the resistor R25, a second end of the resistor R25 is connected to the tv main control board 4, a drain of the MOS transistor Q12 is connected to the second end of the resistor R26, a source of the MOS transistor Q637 is grounded, a gate of the MOS transistor Q12 is connected to the first end of the capacitor C9, a second end of the capacitor C9 is grounded, a first end of the resistor R9 is connected to the gate of the MOS transistor Q874, a second end of the tv main control board 9 is connected to the tv main control board 4, the first end of the resistor R28 is connected to the gate of the MOS transistor Q12, and the second end of the resistor R28 is grounded.
In an alternative embodiment, the adjusting circuit 3 includes a first adjusting circuit and a second adjusting circuit, the adjusting circuit includes a first adjusting circuit and a second adjusting circuit, the first adjusting circuit is configured to adjust the overvoltage protection voltage of the backlight light bar according to a first adjusting signal in a second signal sent by the television main control board, and the second adjusting circuit adjusts the light bar current of the backlight light bar according to a second adjusting signal in the second signal sent by the television main control board. The first adjusting circuit is connected with the television main control board and the module backlight lamp bar, and the second adjusting circuit is connected with the television main control board and the module backlight lamp bar.
In an alternative embodiment, the multiple paths of regulating circuits 3 may be arranged to respectively regulate the overvoltage protection voltage and the lamp strip current of the backlight lamp strip 6 of the module, and the specific circuit setting condition may be adjusted according to actual requirements, which is not limited in this embodiment.
The overvoltage protection circuit 7 is connected between the booster circuit 2 and the module backlight lamp strip 6 and used for setting an initial overvoltage protection value to protect the module backlight lamp strip 6. The overvoltage protection circuit 7 includes: the backlight module comprises a resistor R22, a resistor R23 and a capacitor C18, wherein a first end of the resistor R22 is connected to the module backlight lamp bar 6, a second end of the resistor R22 is connected to a first end of the resistor R23, a second end of the resistor R23 is grounded, a first end of the capacitor C18 is connected to a second end of the resistor R22, and a second end of the capacitor C18 is grounded.
In the present embodiment, the resistor R22, the resistor R23 and the capacitor C18 form a circuit overvoltage protection circuit 7 for setting an initial overvoltage protection value. The overvoltage protection circuit 7 is used for limiting the output voltage amplitude of the booster circuit 2 when the booster circuit 2 works abnormally, so that the lamp strip is protected, and the reliability of the module lamp strip is improved.
This embodiment discloses an adjusting circuit of module backlight lamp strip of TV set, this circuit is connected with TV set main control board, signal input part and module backlight lamp strip, includes: the filter circuit is connected with the signal input end and the television main control board and is used for rectifying and filtering a first voltage input by the signal input end and outputting a second voltage and a third voltage, and the third voltage is supplied to the television main control board; the boosting circuit is connected with the filter circuit and the module backlight lamp bar and used for boosting the second voltage to a fourth voltage according to a first signal sent by the television main control board and providing the fourth voltage for the module backlight lamp bar; the adjusting circuit is connected with the television main control board and the module backlight lamp bar and is used for adjusting an overvoltage protection point of the backlight lamp bar according to a second signal sent by the television main control board; and the overvoltage protection circuit is connected between the booster circuit and the module backlight lamp bar and is used for setting an initial overvoltage protection value to protect the module backlight lamp bar. The adjusting circuit of the backlight lamp bar of the television set, provided by the embodiment of the invention, realizes the adjusting function of adjusting the backlight lamp bar of the module through two paths of PMW signals, solves the problem of matching with the lamp bar current settings of different screen bodies, and realizes the overvoltage protection OVP function of adjusting the voltage of the lamp bar with different specifications through matching with software.
EXAMPLE III
Fig. 6 is a flowchart of a method for adjusting a backlight bar of a television set according to a third embodiment of the present invention, where the method for adjusting a backlight bar of a television set according to the third embodiment of the present invention can be executed by a television set, and specifically includes:
and step 300, acquiring a first signal and a second signal of a television main control board.
In this embodiment, the first signal is an enable signal (ENA) and a PWM dimming signal (PWM1) sent by the tv main control board, and the second signal is a PWM dimming signal (PWM2) sent by the tv main control board.
And 310, adjusting the overvoltage protection current of the backlight lamp bar of the module according to the duty ratio of the first signal.
Referring to fig. 7, in the present embodiment, step 310 further includes:
step 311, determining whether the duty ratio of the first signal is equal to a first percentage.
And step 312, if so, adjusting the backlight brightness of the module backlight light bar according to the duty ratio to adjust the light bar current of the module backlight light bar.
And 313, if not, acquiring the current duty ratio of the first signal.
And step 314, adjusting the backlight brightness of the module backlight lamp bar according to the current duty ratio so as to adjust the lamp bar current of the module backlight lamp bar.
In this embodiment, the duty ratio refers to a ratio of the energization time to the total time in one pulse cycle. After the television main control board system is started up and normally works, the duty ratio of the PWM1 is firstly judged, and when the PWM1 is a dimming signal, the duty ratio range of the PWM1 signal is 0-100% and the PWM1 signal is used for controlling the brightness change of the backlight module. And adjusting the backlight brightness of the module on the television menu according to the step length of 100% A/100% A. When the Duty ratio of the PWM1 is 100%, the corresponding maximum backlight current is 100% U _ ref/R _ s, where U _ ref is the voltage of PIN10(ISEN) PIN, and R _ s is the resistor R19 matched with PIN10(ISEN) PIN, at this time, the rated current of the LED module light bar of the a-screen body is U _ ref/R19, and when the corresponding backlight brightness of the tv menu is adjusted to 100 at most, the Duty ratio Duty1_ max of the PWM1 is 100%.
When the duty ratio of the PWM1 is x%, the duty ratio range of the PWM1 signal is 0-x% and is used for controlling the brightness change of the backlight module. And adjusting the backlight brightness of the module on the television menu according to the step length of x% A/100. The corresponding maximum backlight current is x% U _ ref/R _ s, at this time, the rated current of the LED module light bar of the B-screen body is x% U _ ref/R19, and when the corresponding backlight brightness of the television menu is adjusted to be maximum 100, the Duty ratio Duty1_ max of the PWM1 is x%.
Similarly, when different module light bar currents of a C screen, a D screen and the like are matched, the rated currents of the corresponding LED module light bars are x 1% U _ ref/R19 and x 2% U _ ref/R19 … … in sequence, and when the backlight brightness of the corresponding television menu is adjusted to be 100 at maximum, the Duty ratios of PWM1 are respectively x 1% and x 2% … … for Duty1_ max, so that the software adjusting function of matching different module light bar currents is realized.
And step 320, adjusting the overvoltage protection voltage of the backlight lamp bar of the module according to the duty ratio of the second signal.
Referring to fig. 8, in the present embodiment, step 320 further includes:
step 321, obtaining a plurality of critical points according to the second signal.
And 322, matching one point of a plurality of corresponding critical points according to the duty ratio of the second signal.
And 323, adjusting the overvoltage protection voltage of the backlight lamp bar of the module according to the matched voltage value of the critical point.
In this embodiment, the voltage matching with different module light bars is determined, so that the hardware parameter of constant current overvoltage protection (OVP) is not changed, and only the initial OVP value is set through the preset resistor, and when the OVP value is required to be adjusted according to different matched module light bar voltages, the duty ratio of PWM2 output by the overvoltage protection adjusting circuit and the software control of the television main control board is required.
For example, let Duty2 be the dimming Duty cycle of PWM2, and a%, b%, and c% be the Duty cycle values of three critical points of Duty2, Uovp0OVP initial set value, U, of module light bar voltage set for resistor voltage divisionovpThe OVP voltage value is the voltage value of the adjustable module light bar.
When Duty2 ∈ (0, a%), Uovp<Uovp0That is, when Duty2 changes at 0-a%, the light bar UovpIs smaller than the lamp strip Uovp0An initial setting value.
When Duty2 ═ b%, Uovp＝Uovp0That is, when Duty2 is b%, the light bar UovpEqual to lamp strip Uovp0An initial setting value.
When Duty2 ∈ (c%, 100%), Uovp>Uovp0That is, when Duty2 changes between a% and 100%, light bar UovpGreater than the lamp strip Uovp0An initial setting value.
Illustratively, when the television main control board sends out a PWM2 signal, the OVP value of the light bar is adjusted by the current flowing into and out of the point, so that when the Duty2 changes between 0 and 100 percent, U is realizedovpThe software of wide range voltage adjusts the function to when matching different module group backlight lamp strip voltages, realize the settlement of the OVP value of lamp strip through adjusting PWM 2's duty cycle. In practical applications, the required OVP adjustment range can be achieved by initial parameter settings, in combination with PWM2 software.
The embodiment of the invention discloses a method for adjusting a backlight lamp bar of a television module, which comprises the following steps: acquiring a first signal and a second signal of a television main control board; adjusting the lamp strip current of the module backlight lamp strip according to the duty ratio of the first signal; and adjusting the overvoltage protection voltage of the backlight lamp bar of the module according to the duty ratio of the second signal. The adjusting circuit of the backlight lamp bar of the television set, provided by the embodiment of the invention, realizes the adjusting function of adjusting the backlight lamp bar of the module through two paths of PMW signals, solves the problem of matching with the lamp bar current settings of different screen bodies, and realizes the overvoltage protection OVP function of adjusting the voltage of the lamp bar with different specifications through matching with software.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (12)

1. The utility model provides an adjusting circuit of module backlight lamp strip of TV set, is connected with TV set main control board, signal input part and module backlight lamp strip, its characterized in that includes:
the filter circuit is connected with the signal input end and the television main control board and is used for rectifying and filtering a first voltage input by the signal input end and outputting a second voltage and a third voltage, and the third voltage is supplied to the television main control board;
the boosting circuit is connected with the filter circuit and the module backlight lamp bar and used for boosting the second voltage to a fourth voltage according to a first signal sent by the television main control board and providing the fourth voltage for the module backlight lamp bar;
and the adjusting circuit is connected with the television main control board and the module backlight lamp bar and is used for adjusting the overvoltage protection point of the backlight lamp bar according to a second signal sent by the television main control board.
2. The adjusting circuit of claim 1, wherein the filter circuit comprises: a diode D10, a diode D20, a capacitor C10 and a capacitor C20, wherein the anode of the diode D10 is connected to the first output end of the signal input end, the cathode of the diode D10 is connected to the first end of the capacitor C10, and the second end of the capacitor C10 is grounded; the anode of the diode D20 is connected to the second output terminal of the signal input terminal, the cathode of the diode D20 is connected to the first terminal of the capacitor C20, and the second terminal of the capacitor C20 is grounded.
3. The adjusting circuit of claim 1, wherein the boost circuit comprises: a capacitor C11, an inductor L10, a diode D11, a capacitor C12, a MOS transistor Q10, a resistor R10, a resistor R11, a resistor R12, a chip U10, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, and a capacitor C17, wherein a first end of the capacitor C11 is connected to the inductor L10, a second end of the capacitor C11 is grounded, a second end of the inductor L10 is connected to an anode of the diode D11, a cathode of the diode D11 is connected to a first end of the capacitor C12, and a second end of the capacitor C12 is grounded; the drain of the MOS transistor Q10 is connected to the second terminal of the inductor L10, the source of the MOS transistor Q10 is connected to the first terminal of the resistor R12, the second terminal of the resistor R12 is grounded, the gate of the MOS transistor Q10 is connected to the first terminal of the resistor R10, the second terminal of the resistor R10 is connected to the 15 th pin of the chip U10, the first terminal of the resistor R11 is connected to the source of the MOS transistor Q10, the second terminal of the resistor R11 is connected to the 12 th pin of the chip U10, the first terminal of the resistor R13 is connected to the filter circuit, the second terminal of the resistor R13 is connected to the first terminal of the resistor R14, the second terminal of the resistor R14 is connected to the first terminal of the capacitor C14, the first terminal of the capacitor C13 is connected to the chip U10, the second terminal of the capacitor C13 is grounded, the second terminal of the capacitor C14 is grounded to the 4 th pin of the chip U10, a first end of the resistor R15 is connected to the 5 th pin of the chip U10, a second end of the resistor R15 is grounded, a first end of the resistor R16 is connected to the 7 th pin of the chip U10, a second end of the resistor R16 is connected to the second end of the capacitor C14, a first end of the resistor R17 is connected to the chip U10, a second end of the resistor R17 is grounded, a first end of the resistor R18 is connected to the 9 th pin of the chip U10, a second end of the resistor R18 is connected to the first end of the capacitor C16, a second end of the capacitor C16 is grounded, a first end of the capacitor C15 is connected to the 9 th pin of the chip U10, a second end of the capacitor C15 is grounded, a first end of the capacitor C17 is connected to the 8 th pin of the chip U10, a second end of the capacitor C17 is grounded, a first end of the resistor R19 is connected to the 10 th pin of the chip U10, the second end of the resistor R19 is grounded, the first end of the resistor R20 is connected to the 3 rd pin of the chip U10, the second end of the resistor R20 is connected to the television main control board, the first end of the resistor R21 is connected to the 6 th pin of the chip U10, and the second end of the resistor R21 is connected to the television main control board.
4. The adjusting circuit of claim 1, wherein the adjusting circuit comprises a first adjusting circuit and a second adjusting circuit, the first adjusting circuit is configured to adjust the overvoltage protection voltage of the backlight lamp strip according to a first adjusting signal in the second signal sent by the television main control board, and the second adjusting circuit is configured to adjust the lamp strip current of the backlight lamp strip according to a second adjusting signal in the second signal sent by the television main control board.
5. The adjusting circuit of claim 4, wherein the first adjusting circuit is connected to the TV main control board and the modular backlight bar, and the second adjusting circuit is connected to the TV main control board and the modular backlight bar.
6. The adjusting circuit of claim 1, wherein the adjusting circuit comprises: a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a capacitor C20, a capacitor C19, and a MOS transistor Q12, wherein a first end of the resistor R24 is connected to the backlight light bar of the module, a second end of the resistor R24 is connected to a first end of the capacitor C20, a second end of the capacitor C20 is grounded, a first end of the resistor R26 is connected to a second end of the resistor R24, a second end of the resistor R26 is connected to a first end of the resistor R25, a second end of the resistor R25 is connected to the tv main control board, a drain of the MOS transistor Q12 is connected to a second end of the resistor R26, a source of the MOS transistor Q12 is grounded, a gate of the MOS transistor Q12 is connected to a first end of the capacitor C9, a second end of the capacitor C19 is grounded, a first end of the resistor R27 is connected to a gate of the MOS transistor Q12, a second end of the resistor R27 is connected to the tv main control board, the first end of the resistor R28 is connected to the gate of the MOS transistor Q12, and the second end of the resistor R28 is grounded.
7. The adjusting circuit of claim 1, further comprising: and the overvoltage protection circuit is connected between the booster circuit and the module backlight lamp bar and is used for setting an initial overvoltage protection value to protect the module backlight lamp bar.
8. The adjusting circuit of claim 7, wherein the over-voltage protection circuit comprises: the backlight module comprises a resistor R22, a resistor R23 and a capacitor C18, wherein a first end of the resistor R22 is connected to the backlight light bar of the module, a second end of the resistor R22 is connected to a first end of the resistor R23, a second end of the resistor R23 is grounded, a first end of the capacitor C18 is connected to a second end of the resistor R22, and a second end of the capacitor C18 is grounded.
9. A method for adjusting a backlight bar of a television module is characterized by comprising the following steps:
acquiring a first signal and a second signal of a television main control board;
adjusting the lamp strip current of the module backlight lamp strip according to the duty ratio of the first signal;
and adjusting the overvoltage protection voltage of the backlight lamp bar of the module according to the duty ratio of the second signal.
10. The method of claim 9, wherein the adjusting the lamp strip current of the modular backlight lamp strip according to the duty cycle of the first signal comprises:
determining whether a duty cycle of the first signal is equal to a first percentage;
if so, adjusting the backlight brightness of the module backlight lamp bar according to the duty ratio so as to adjust the lamp bar current of the module backlight lamp bar.
11. The method of claim 10, further comprising:
if not, acquiring the current duty ratio of the first signal;
and adjusting the backlight brightness of the module backlight lamp bar according to the current duty ratio so as to adjust the lamp bar current of the module backlight lamp bar.
12. The method of claim 9, wherein the adjusting the overvoltage protection voltage of the modular backlight light bar according to the duty cycle of the second signal comprises:
acquiring a plurality of critical points according to the second signal;
matching one point of a plurality of critical points corresponding to the duty ratio of the second signal according to the duty ratio of the second signal;
and adjusting the overvoltage protection voltage of the module backlight lamp strip according to the matched voltage value of the critical point.
CN202011073361.0A 2020-10-09 2020-10-09 Adjusting circuit and method for module backlight lamp bar of television Pending CN112216245A (en)

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103050094A (en) * 2012-12-27 2013-04-17 深圳市华星光电技术有限公司 Overvoltage protection method for backlight driving circuit in 2D/3D (two-dimensional/three-dimensional) mode and backlight driving circuit applying overvoltage protection method
CN103280191A (en) * 2013-05-20 2013-09-04 深圳市华星光电技术有限公司 LED (light-emitting diode) backlight driving circuit, LCD (liquid crystal display) device and driving method
CN204423880U (en) * 2014-08-26 2015-06-24 康佳集团股份有限公司 A kind of LED backlight drive circuit of liquid crystal TV set
CN104766567A (en) * 2015-03-18 2015-07-08 康佳集团股份有限公司 LED backlight driving circuit and brightness regulating method of LED backlight
CN205946252U (en) * 2016-07-13 2017-02-08 深圳Tcl数字技术有限公司 Led actuating device
CN107105178A (en) * 2017-04-20 2017-08-29 深圳市华星光电技术有限公司 TV set power
CN206775786U (en) * 2017-05-17 2017-12-19 康佳集团股份有限公司 A kind of light bar protective circuit and television set
CN108231014A (en) * 2018-02-08 2018-06-29 深圳创维－Rgb电子有限公司 A kind of local dimming constant-current control circuit, driving power and television set
CN109547721A (en) * 2018-12-25 2019-03-29 深圳创维－Rgb电子有限公司 A kind of TV power supply driving device and television set
CN208971648U (en) * 2018-10-26 2019-06-11 深圳创维－Rgb电子有限公司 A kind of television set and multi-functional TV electromechanical source
CN110996425A (en) * 2019-11-26 2020-04-10 深圳创维－Rgb电子有限公司 Light bar overshoot protection circuit and backlight module
CN211062443U (en) * 2019-11-28 2020-07-21 深圳创维－Rgb电子有限公司 Module backlight control circuit and television

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103050094A (en) * 2012-12-27 2013-04-17 深圳市华星光电技术有限公司 Overvoltage protection method for backlight driving circuit in 2D/3D (two-dimensional/three-dimensional) mode and backlight driving circuit applying overvoltage protection method
CN103280191A (en) * 2013-05-20 2013-09-04 深圳市华星光电技术有限公司 LED (light-emitting diode) backlight driving circuit, LCD (liquid crystal display) device and driving method
CN204423880U (en) * 2014-08-26 2015-06-24 康佳集团股份有限公司 A kind of LED backlight drive circuit of liquid crystal TV set
CN104766567A (en) * 2015-03-18 2015-07-08 康佳集团股份有限公司 LED backlight driving circuit and brightness regulating method of LED backlight
CN205946252U (en) * 2016-07-13 2017-02-08 深圳Tcl数字技术有限公司 Led actuating device
CN107105178A (en) * 2017-04-20 2017-08-29 深圳市华星光电技术有限公司 TV set power
CN206775786U (en) * 2017-05-17 2017-12-19 康佳集团股份有限公司 A kind of light bar protective circuit and television set
CN108231014A (en) * 2018-02-08 2018-06-29 深圳创维－Rgb电子有限公司 A kind of local dimming constant-current control circuit, driving power and television set
CN208971648U (en) * 2018-10-26 2019-06-11 深圳创维－Rgb电子有限公司 A kind of television set and multi-functional TV electromechanical source
CN109547721A (en) * 2018-12-25 2019-03-29 深圳创维－Rgb电子有限公司 A kind of TV power supply driving device and television set
CN110996425A (en) * 2019-11-26 2020-04-10 深圳创维－Rgb电子有限公司 Light bar overshoot protection circuit and backlight module
CN211062443U (en) * 2019-11-28 2020-07-21 深圳创维－Rgb电子有限公司 Module backlight control circuit and television

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Application publication date: 20210112