CN114170973B - Backlight control signal self-adaption device and method - Google Patents
Backlight control signal self-adaption device and method Download PDFInfo
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- CN114170973B CN114170973B CN202111345517.0A CN202111345517A CN114170973B CN 114170973 B CN114170973 B CN 114170973B CN 202111345517 A CN202111345517 A CN 202111345517A CN 114170973 B CN114170973 B CN 114170973B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The application discloses a backlight control signal self-adaptive device and a method, which relate to the technical field of display and are used for solving the problem that hardware used by a circuit of a signal controller is adaptively modified/added according to the modulation mode of a used backlight driver when backlight modulation is carried out; the method comprises the following steps: determining the working mode of the filtering unit according to the received backlight control signal sent by the signal controller through the filtering unit; under the working mode, processing the pulse width modulation signal through a filtering unit to obtain a target modulation signal, and sending the target modulation signal to a backlight driver; generating a backlight driving signal based on the received target modulation signal through a backlight driver, and sending the backlight driving signal to a current detector; detecting the current of the backlight driving signal through a current detector to obtain a current detection signal; and determining the backlight control signal sent to the filtering unit by the signal controller according to the current detection signal sent by the received current detection signal.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a backlight control signal adaptive apparatus and method.
Background
Liquid Crystal Displays (LCDs) are widely used in video devices, advertisement machines, and the like because of their mature technology and thin appearance. The display principle is that the rotation of liquid crystal molecules is controlled through voltage change so as to achieve the purpose of displaying by controlling whether polarized Light output of each pixel point is controlled.
Currently, a backlight driver of an LED backlight mainly has two dimming modes, i.e., pulse Width Modulation (PWM) and direct current dimming control, as a backlight control signal to control the LED brightness. However, the backlight driver has a different dimming method depending on the manufacturer of the backlight driver. Therefore, adapting to different manufacturers of backlight drivers requires modifying the circuitry of the signal controller or soldering different component lists (BOM), resulting in increased cost of the signal controller.
Therefore, in order to satisfy different dimming modes of the backlight driver, the conventional LED backlight needs to design different circuits of the signal controller for different dimming modes, which results in high production cost.
Disclosure of Invention
The application provides a backlight control signal self-adapting device, a method and a storage medium, which are used for solving the problem that in the prior art, when the backlight modulation is carried out on an LCD, circuits of different signal controllers are designed aiming at backlight drivers with different modulation modes.
In a first aspect, the present application provides a backlight control signal adaptive device, which includes a signal controller, a current detector, a backlight driver, and a filtering unit; the output end of the signal controller is respectively connected with the backlight driver and the filtering unit, the input end of the signal controller is connected with the output end of the current detector, the input end of the current detector is connected with the output end of the backlight driver, and the output end of the filtering unit is connected with the input end of the backlight driver;
the signal controller is used for generating a pulse width modulation signal, a backlight enabling signal and a backlight control signal, sending the pulse width modulation signal and the backlight control signal to the filtering unit, and sending the backlight enabling signal to the backlight driver; determining a backlight control signal sent to the filtering unit according to the received current detection signal; the backlight control signal is used for representing the dimming mode of the backlight driver; the dimming mode comprises a pulse width modulation mode and a direct current dimming control mode;
the filtering unit is used for determining the working mode of the filtering unit according to the received backlight control signal; and under the determined working mode, processing the received pulse width modulation signal to obtain a target modulation signal, and sending the target modulation signal to the backlight driver;
the backlight driver is used for generating a backlight driving signal based on the received target modulation signal after receiving the backlight enabling signal and sending the backlight driving signal to the current detector;
the current detector is used for detecting the current of the received backlight driving signal, obtaining the current detection signal and sending the current detection signal to the signal controller.
In the embodiment of the application, the signal controller sends the backlight control signal to the filter unit, so that the filter unit processes the pulse width modulation signal sent by the signal controller in the corresponding working mode of the backlight control signal, and sends the processed target modulation signal to the backlight driver, so that the backlight driver generates the backlight driving signal based on the received target modulation signal; detecting the current of a backlight driving signal generated by a backlight driver through a current detector to obtain a current detection signal; then, the signal controller determines the backlight control signal sent to the filter unit according to the received current detection signal sent by the current detector, so that the dimming mode represented by the backlight control signal sent to the filter unit is the same as the dimming mode of the backlight driver, and the working mode of the filter unit is switched to the working mode suitable for the dimming mode of the backlight driver, thereby realizing the self-adaptive adjustment of the dimming mode of the backlight driver, and the device provided by the application realizes the compatibility of the pulse width modulation mode and the direct current dimming control mode of the backlight driver.
In one possible implementation, the pulse width modulation signal includes a first pulse width modulation signal and a second pulse width modulation signal, and a duty ratio of the second pulse width modulation signal is an integer multiple of a duty ratio of the first pulse width modulation signal; the backlight control signal comprises a first backlight control signal for indicating that the working mode of the filtering unit is the transmission mode or a second backlight control signal for indicating that the working mode of the filtering unit is the filtering mode; the dimming mode represented by the first backlight control signal is different from the dimming mode represented by the second backlight control signal;
after the signal controller sends the first backlight control signal to the filtering unit, the signal controller is specifically configured to:
after sending a first pulse width modulation signal to the filtering unit, sending the backlight enabling signal to the backlight driver, and receiving a first current detection signal sent by the current detector;
after receiving the first current detection signal and sending the second pulse width modulation signal to the filtering unit, sending the backlight enable signal to the backlight driver and receiving a second current detection signal sent by the current detector;
and determining whether the backlight control signal sent to the filtering unit is the first backlight control signal according to the first current detection signal and the second current detection signal.
After sending the first backlight control signal to the filtering unit, the signal controller in the embodiment of the application sequentially sends a first pulse width modulation signal and a second pulse width modulation signal to the filtering unit, and receives a first current detection signal corresponding to the first pulse width modulation signal and a second current detection signal corresponding to the second pulse width modulation signal; then, the signal controller determines whether the backlight control signal sent to the filter unit is the first backlight control signal according to the first current detection signal and the second current detection signal based on the relationship between the first pulse width modulation signal and the second pulse width modulation signal, can simply and directly determine whether the dimming mode represented by the first backlight control signal is matched with the dimming mode of the backlight driver, and provides a basis for the subsequent process of adaptively adjusting the backlight control signal sent to the filter unit to adapt to the dimming mode of the backlight driver.
In one possible implementation, the signal controller is specifically configured to:
determining whether the first backlight control signal matches a dimming manner of the backlight driver according to the first current detection signal and the second current detection signal;
and determining whether the backlight control signal sent to the filtering unit is the first backlight control signal according to the matching result.
According to the embodiment of the application, after whether the first backlight control signal is matched with the dimming mode of the backlight driver or not is determined according to the first current detection signal and the second current detection signal, whether the backlight control signal sent to the filtering unit is the first backlight control signal or not can be directly and clearly determined according to the matching result, and the accuracy of determining the backlight control signal sent to the filtering unit is improved.
In one possible implementation, the signal controller is specifically configured to:
and if the difference value of the current value of the second current detection signal and the integral multiple of the current value of the first current detection signal is smaller than a set difference value, determining that the dimming mode of the first backlight control signal is matched with the dimming mode of the backlight driver.
In the embodiment of the application, the first pulse width modulation signal and the second pulse width modulation signal with different duty ratios are sent to the filtering unit, the first current detection signal corresponding to the first pulse width modulation signal and the second current detection signal corresponding to the second pulse width modulation signal are received, and in the backlight control signal adaptive device, if the modulation mode of the first backlight control signal is matched with that of the backlight driver, the multiple relation between the duty ratio of the first pulse width modulation signal and the duty ratio of the second pulse width modulation signal is the same as the multiple relation between the current value of the first current detection signal and the current value of the second current detection signal; therefore, in the embodiment of the present application, when it is determined that the difference between the current value of the second current detection signal and the integer multiple of the current value of the first current detection signal is smaller than the set difference, it can be determined that the first backlight control signal matches the dimming manner of the backlight driver, and the operation is simple.
In one possible implementation, the signal controller is specifically configured to:
if the matching result is that the first backlight control signal is matched with the dimming mode of the backlight driver, determining the backlight control signal sent to the filtering unit as the first backlight control signal;
and if the matching result is that the first backlight control signal is not matched with the dimming mode of the backlight driver, sending a second backlight control signal to the filtering unit so as to determine whether the backlight control signal sent to the filtering unit is the second backlight control signal according to the received current detection signal.
According to the embodiment of the application, when the first backlight control signal is matched with the dimming mode of the backlight driver, the backlight control signal sent to the filtering unit is determined to be the first backlight control signal; and when the current detection signal is not matched with the first backlight control signal, the first backlight control signal is sent to the filter unit, and whether the first backlight control signal is matched with the dimming mode of the backlight driver or not is determined according to the received current detection signal, so that whether the backlight control signal sent to the filter unit is the first backlight control signal or not is determined, and therefore self-adaptive adjustment of the backlight control signal sent to the filter unit is achieved.
In one possible implementation, the operation mode includes a filtering mode and a transmission mode; the filtering unit is specifically configured to:
if the backlight control signal is a signal representing the direct current dimming control mode, determining that the working mode is the filtering mode, filtering the pulse width modulation signal into a direct current modulation signal, and sending the direct current modulation signal serving as the target modulation signal to the backlight driver;
and if the backlight control signal is a signal representing the pulse width modulation mode, determining that the working mode is the transmission mode, and sending the pulse width modulation signal to the backlight driver as the target modulation signal.
The working modes of the filtering unit in the embodiment of the application comprise a filtering mode and a transmission mode, wherein the filtering mode is suitable for a direct current dimming control mode, and the transmission mode is suitable for a pulse width modulation mode, so that the backlight control signal self-adaption device realizes the compatibility of the direct current dimming control mode and the pulse width modulation mode of the backlight driver, the hardware is unified, the production and the maintenance are convenient, and the realization cost is low.
In a second aspect, the present application provides a backlight control signal adaptive method, including:
generating a pulse width modulation signal, a backlight enable signal and a backlight control signal through a signal controller, and transmitting the pulse width modulation signal and the backlight control signal to a filtering unit and transmitting the backlight enable signal to a backlight driver;
determining, by the filtering unit, a working mode of the filtering unit according to the received backlight control signal; processing the received pulse width modulation signal through the filtering unit under the determined working mode to obtain a target modulation signal, and sending the target modulation signal to the backlight driver;
after the backlight driver receives the backlight enabling signal, generating a backlight driving signal based on the received target modulation signal through the backlight driver, and sending the backlight driving signal to the current detector;
detecting the current of the received backlight driving signal through the current detector to obtain a current detection signal, and sending the current detection signal to the signal controller;
determining, by the signal controller, a backlight control signal transmitted to the filtering unit according to the received current detection signal; the backlight control signal is used for representing the dimming mode of the backlight driver; the dimming mode comprises a pulse width modulation mode and a direct current dimming control mode.
In one possible implementation, the pulse width modulation signal includes a first pulse width modulation signal and a second pulse width modulation signal, and a duty ratio of the second pulse width modulation signal is an integer multiple of a duty ratio of the first pulse width modulation signal; the backlight control signal comprises a first backlight control signal for indicating that the working mode of the filtering unit is the transmission mode or a second backlight control signal for indicating that the working mode of the filtering unit is the filtering mode; the dimming mode represented by the first backlight control signal is different from the dimming mode represented by the second backlight control signal;
after the first backlight control signal is transmitted to the filtering unit through the signal controller, the method further includes:
after the signal controller sends a first pulse width modulation signal to the filtering unit, the signal controller sends the backlight enabling signal to the backlight driver, and the signal controller receives a first current detection signal sent by the current detector;
after receiving the first current detection signal and sending the second pulse width modulation signal to the filtering unit through the signal controller, sending the backlight enable signal to the backlight driver through the signal controller, and receiving the second current detection signal sent by the current detector through the signal controller;
determining, by the signal controller, a backlight control signal transmitted to the filtering unit according to the received current detection signal, including:
and determining, by the signal controller, whether the backlight control signal transmitted to the filtering unit is the first backlight control signal according to the first current detection signal and the second current detection signal.
In a possible implementation manner, the determining, by the signal controller, whether the backlight control signal sent to the filtering unit is the first backlight control signal according to the first current detection signal and the second current detection signal includes:
determining whether the first backlight control signal matches a dimming manner of the backlight driver according to the first current detection signal and the second current detection signal;
and determining whether the backlight control signal sent to the filtering unit is the first backlight control signal according to the matching result.
In one possible implementation manner, the determining whether the first backlight control signal matches a dimming manner of the backlight driver according to the first current detection signal and the second current detection signal includes:
and if the difference value of the current value of the second current detection signal and the integral multiple of the current value of the first current detection signal is smaller than a set difference value, determining that the first backlight control signal is matched with the dimming mode of the backlight driver.
In a possible implementation manner, the determining whether the backlight control signal sent to the filtering unit is the first backlight control signal according to the matching result includes:
if the matching result is that the first backlight control signal is matched with the dimming mode of the backlight driver, determining the backlight control signal sent to the filtering unit as the first backlight control signal;
and if the matching result is that the first backlight control signal is not matched with the dimming mode of the backlight driver, sending a second backlight control signal to the filtering unit so as to determine whether the backlight control signal sent to the filtering unit is the second backlight control signal according to the received current detection signal.
In one possible implementation, the operating modes include a filtering mode and a transmission mode; determining, by the filtering unit, a working mode of the filtering unit according to the received backlight control signal, including:
if the backlight control signal is a signal representing the direct current dimming control mode, determining that the working mode is the filtering mode;
if the backlight control signal is a signal representing the pulse width modulation mode, determining that the working mode is the transmission mode;
in the determined operating mode, processing the received pulse width modulation signal by the filtering unit to obtain a target modulation signal, and sending the target modulation signal to the backlight driver, including:
if the determined working mode is the filtering mode, filtering the pulse width modulation signal into a direct current modulation signal through the filtering unit, and sending the direct current modulation signal to the backlight driver as the target modulation signal;
and if the determined working mode is the transmission mode, sending the pulse width modulation signal as the target modulation signal to the backlight driver through the filtering unit.
For technical effects brought by any implementation manner in the second aspect, reference may be made to technical effects brought by a corresponding implementation manner in the first aspect, and details are not described here again.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a backlight control signal adaptive apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another backlight control signal adaptive apparatus according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another backlight control signal adaptive apparatus according to an embodiment of the present disclosure;
fig. 4 is a flowchart illustrating a method for a signal controller to perform a backlight control signal adaptation according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. 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 invention.
Some of the words that appear in the text are explained below:
the term "and/or" in the embodiments of the present invention describes an association relationship of associated objects, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In the prior art, a backlight driver of an LED backlight mainly has two dimming modes, namely PWM dimming control and dc dimming control, and because manufacturers of the backlight driver are different, the modulation modes of the backlight driver are also different. Therefore, adapting the backlight drivers from different manufacturers requires modifying the circuitry of the signal controller or soldering different BOMs. Therefore, in the design scheme of the backlight driver of the LED backlight, a circuit of the information controller needs to be designed for different dimming modes of the backlight driver, which is high in maintenance cost and not beneficial to production.
Based on the foregoing problems, embodiments of the present application provide a backlight control signal adaptive apparatus and method.
As shown in fig. 1, an embodiment of the present application provides a backlight control signal adaptive apparatus, which includes a signal controller 101, a current detector 104, a backlight driver 103, and a filtering unit 102;
wherein:
the output end of the signal controller 101 is connected with the backlight driver 103 and the filter unit 102 respectively, the input end of the signal controller 101 is connected with the output end of the current detector 104, the input end of the current detector 104 is connected with the output end of the backlight driver 101, and the output end of the filter unit 102 is connected with the input end of the backlight driver 103.
The signal controller 101 is configured to generate a pulse width modulation signal, a backlight enable signal, and a backlight control signal, send the pulse width modulation signal and the backlight control signal to the filtering unit 102, and send the backlight enable signal to the backlight driver 103; and determines a backlight control signal transmitted to the filtering unit 102 according to the received current detection signal.
It should be noted that the backlight control signal is used to characterize the dimming mode of the backlight driver; the dimming mode includes a pulse width modulation mode and a direct current dimming control mode.
The filtering unit 102 is configured to determine an operating mode of the filtering unit 102 according to the received backlight control signal; and processing the received pulse width modulation signal in the determined operating mode to obtain a target modulation signal, and sending the target modulation signal to the backlight driver 103.
Specifically, if the backlight control signal received by the filtering unit 102 is a signal representing a direct current dimming control manner, the operating mode is determined to be a filtering mode, the pulse width modulation signal is filtered to be a direct current modulation signal, and the direct current modulation signal is sent to the backlight driver 103 as a target modulation signal.
If the backlight control signal received by the filtering unit 102 is a signal representing a pulse width modulation mode, the operating mode is determined to be a transmission mode, and the pulse width modulation signal is sent to the backlight driver 103 as a target modulation signal.
The backlight driver 103 is configured to generate a backlight driving signal based on the received target modulation signal after receiving the backlight enable signal, and send the backlight driving signal to the current detector 104.
The current detector 104 is configured to detect a current of the received backlight driving signal, obtain a current detection signal, and send the current detection signal to the signal controller 101.
Alternatively, as shown in fig. 2, the filtering unit 102 may include a software control switch 1021 and a filter 1022; when the software control switch 1021 receives a backlight control signal representing a direct current dimming control mode, the software control switch 1021 connects the signal controller 101, the filter 1022, and the backlight driver 103, so that the filter filters the received pulse modulation signal to obtain a direct current modulation signal, and sends the direct current modulation signal to the backlight driver 103 as a target modulation signal. When the software control switch receives a backlight control signal representing a pulse width modulation mode, the software control switch 1021 communicates the signal controller 101 with the backlight driver 103, and directly sends the pulse width modulation signal to the backlight driver 103 as a target modulation signal.
In a specific implementation, as the backlight control signal adaptive device shown in fig. 3, the filter 1022 in the filtering unit 102 may be an RC filter, where the filter 1022 includes a resistor 1022-1 and a capacitor 1022-2. In a specific implementation, the signal controller 101 sends the backlight control signal to the software control switch 1021, so that the software control switch 1021 determines whether to be in a conducting state according to the backlight control signal; when the software control switch 1021 receives the backlight control signal representing the pwm mode, the software control switch 1021 is in the off state, and the pwm signal is directly transmitted to the backlight driver 103 through the resistor 1022-1, and at this time, the operation mode of the filter unit 102 is the transmission mode. When the software control switch 1021 receives a backlight control signal representing a direct current dimming control mode, the software control switch 1021 is in a conducting state, at this time, the capacitor 1022-2 is in a conducting state, the Resistor 1022-1 and the capacitor 1022-2 form a Resistor-capacitor (RC) filter, the pulse width modulation signal is filtered, the direct current modulation signal is obtained, the obtained direct current modulation signal is transmitted to the backlight driver 103 as a target modulation signal, and at this time, the working mode of the filtering unit 102 is a filtering mode.
In some embodiments, the pulse width modulated signal comprises a first pulse width modulated signal and a second pulse width modulated signal, wherein a duty cycle of the second pulse width modulated signal is an integer multiple of a duty cycle of the first pulse width modulated signal.
The backlight control signal comprises a first backlight control signal for indicating that the working mode of the filtering unit is a transmission mode or a second backlight control signal for indicating that the working mode of the filtering unit is a filtering mode;
the dimming mode represented by the first backlight control signal is different from the dimming mode represented by the second backlight control signal.
The signal controller 101 generates a first backlight control signal and sends the first backlight control signal to the filtering unit 102, so that the filtering unit 102 sets the operation mode to the transmission mode according to the received first backlight control signal.
The signal controller 101 generates a first pulse width modulation signal after transmitting the first backlight control signal to the filtering unit 102, and transmits the first pulse width modulation signal to the filtering unit 102. The filtering unit 102, after receiving the first pwm signal, sends the first pwm signal as a first target modulation signal to the backlight driver 103 in the transmission mode.
The signal controller 101 generates a backlight enable signal and transmits the backlight enable signal to the backlight driver 103. The backlight driver 103 generates and outputs a first backlight driving signal based on the received first target modulation signal after receiving the backlight enable signal. The current detector 104 performs current detection on the first backlight driving signal output by the backlight driver 103 to obtain a first current detection signal, and sends the obtained first current detection signal to the signal controller 101.
The signal controller 101 sends the second pulse width modulation signal to the filtering unit 102 after receiving the first current detection signal. The filtering unit 102, after receiving the first pulse width modulation signal, sends the first pulse width modulation signal as a first target modulation signal to the backlight driver 103 in the transmission mode.
The process of the information controller 101 sending the backlight enable signal to the backlight driver 103 and receiving the second current detection signal sent by the current detector 104 is the same as the process of receiving the first current detection signal, and is not described herein again.
The signal controller 101 determines whether the backlight control signal transmitted to the filter unit is the first backlight control signal according to the first current detection signal and the second current detection signal after receiving the first current detection signal and the second current detection signal.
In some embodiments, the signal controller 101 determines whether the first backlight control signal matches a dimming manner of the backlight driver according to the first current detection signal and the second current detection signal; then, it is determined whether the backlight control signal transmitted to the filtering unit is the first backlight control signal according to the matching result.
The signal controller 101 may determine whether the first backlight control signal matches the dimming pattern of the backlight driver by:
in a specific implementation, the signal controller 101 determines a current value of the first current detection signal and a current value of the second current detection signal, and determines whether a difference value of the current value of the second current detection signal and an integer multiple of the current value of the first current detection signal is smaller than a set difference value; if it is determined that the first backlight control signal is smaller than the set difference, it is determined that the first backlight control signal matches the dimming manner of the backlight driver 103.
When the backlight control signal matches the dimming mode of the backlight driver 103 and the first pulse width modulation signal and the second pulse width modulation signal are input into the circuit of the backlight control signal adaptive device, the ratio between the first current detection signal and the second current detection signal output by the circuit should be unchanged; accordingly, the duty ratio of the second pulse width modulation signal may be set to an integer multiple of the duty ratio of the first pulse width modulation signal, and whether the dimming manners of the backlight control signal and the backlight driver 103 are matched may be determined by determining whether a difference between the current value of the second current detection signal and the integer multiple of the current value of the first current detection signal is less than a set difference.
For example, the duty ratio of the first pulse width modulation signal is X, the current value of the first current detection signal is Ia, the duty ratio of the second pulse width modulation signal is 2X, the current value of the second current detection signal is Ib, and the difference is set to y; the signal controller 101 determines whether the backlight control signal matches the dimming manner of the backlight driver 103 by determining whether Ib-2Ia is less than y.
After obtaining the matching result, the signal controller 101 determines whether the backlight control signal transmitted to the filter unit is the backlight control signal according to the matching result.
In some embodiments, if the matching result is that the first backlight control signal matches the dimming manner of the backlight driver, the signal controller 101 determines the backlight control signal sent to the filtering unit as the first backlight control signal.
In other embodiments, if the matching result is that the first backlight control signal does not match the dimming manner of the backlight driver, the signal controller 101 sends a second backlight control signal to the filtering unit 102 to determine whether the backlight control signal sent to the filtering unit 102 is the second backlight control unit according to the received current detection signal.
In a specific implementation, the signal controller 101 sends a second backlight control signal to the filtering unit 102, so that the filtering unit 102 sets the operating mode to the filtering mode after receiving the second backlight control signal.
The signal controller 101 sends a first pulse width modulation signal to the filtering unit 102 and sends a backlight enable signal to the backlight driver 103. After receiving the first pwm signal, the filtering unit 102 filters the first pwm signal into a first dc modulation signal in a filtering mode, and sends the first dc modulation signal as a first target modulation signal to the backlight driver 103. The backlight driver 103 generates a first backlight driving signal based on the first target modulation signal after receiving the backlight enable signal, and transmits the first backlight driving signal to the current detector 104. The current detector 104 detects a current of the first backlight driving signal, obtains a first current detection signal, and transmits the first current detection signal to the signal controller 101. The signal controller 101 sends the backlight enable signal to the backlight driver 103 and receives the second current detection signal sent by the current detector 104 after receiving the first current detection signal and sending the second pulse width modulation signal to the filtering unit 102.
The signal controller 101 determines whether the backlight control signal transmitted to the filtering unit is the second backlight control signal according to the first current detection signal and the second current detection signal after receiving the first current detection signal and the second current detection signal.
In some embodiments, the signal controller 101 determines whether the second backlight control signal matches a dimming manner of the backlight driver according to the first current detection signal and the second current detection signal; then, it is determined whether the backlight control signal transmitted to the filtering unit is the second backlight control signal according to the matching result.
In a specific implementation, when the signal controller 101 determines that the difference between the current value of the second current detection signal and the integer multiple of the current value of the first current detection signal is smaller than the set difference, it determines that the second backlight control signal matches the dimming manner of the backlight driver 103, and determines that the backlight control signal sent to the filtering unit 102 is the second backlight control signal.
In some embodiments, if the signal controller 101 determines that the second backlight control signal does not match the dimming manner of the backlight driver 103, an alarm is issued.
As shown in fig. 4, the present embodiment provides a complete flowchart of a method for a signal controller to perform backlight control signal adaptation, including:
step S401, a first backlight control signal is sent to the filtering unit.
It should be noted that the first backlight control signal is a signal for indicating that the operating mode of the filtering unit is the transmission mode; the first backlight control signal is used for representing a dimming mode of the backlight driver.
Step S402, a first pulse width modulation signal is sent to the filtering unit.
In step S403, a backlight enable signal is sent to the backlight driver, and a first current detection signal sent by the current detector is received.
Step S404, sending the second pwm signal to the filtering unit.
It should be noted that the duty cycle of the second pulse width modulation signal is an integer multiple of the duty cycle of the first pulse width modulation signal.
Step S405, sending a backlight enable signal to the backlight driver, and receiving a second current detection signal sent by the current detector.
Step S406, determining whether the difference value of the current value of the second current detection signal and the integral multiple of the current value of the first current detection signal is smaller than a set difference value; if not, executing step S407; if yes, go to step S408.
Step S407, a second backlight control signal is sent to the filtering unit.
It should be noted that the second backlight control signal is a signal for indicating that the operating mode of the filtering unit is the transmission mode; the second backlight control signal is used for representing the dimming mode of the backlight driver; the dimming mode represented by the first backlight control signal is different from the dimming mode represented by the second backlight control signal.
Step S408 ends.
When the signal controller 101 transmits the first backlight control signal to the filter, it is determined that a difference value of the current value of the second current detection signal and an integer multiple of the current value of the first current detection signal is less than a set threshold value, and the first backlight control signal is determined as the backlight control signal transmitted to the filter unit.
When the signal controller 101 transmits the second backlight control signal to the filter, it is determined that a difference value of the current value of the second current detection signal and an integer multiple of the current value of the first current detection signal is less than a set threshold value, and the first backlight control signal is determined as the backlight control signal transmitted to the filter unit.
Based on the same inventive concept, the embodiment of the present application further provides a backlight control signal adaptive method, and as the principle of the method for solving the problem is similar to that of the apparatus, the method may be implemented by referring to the method embodiment, and repeated details are not repeated.
The embodiment of the application provides a backlight control signal self-adaptive method, which comprises the following steps:
generating a pulse width modulation signal, a backlight enable signal and a backlight control signal through a signal controller, and transmitting the pulse width modulation signal and the backlight control signal to a filtering unit and transmitting the backlight enable signal to a backlight driver;
determining, by the filtering unit, a working mode of the filtering unit according to the received backlight control signal; processing the received pulse width modulation signal through the filtering unit under the determined working mode to obtain a target modulation signal, and sending the target modulation signal to the backlight driver;
after the backlight driver receives the backlight enabling signal, generating a backlight driving signal based on the received target modulation signal through the backlight driver, and sending the backlight driving signal to the current detector;
detecting the current of the received backlight driving signal through the current detector to obtain a current detection signal, and sending the current detection signal to the signal controller;
determining, by the signal controller, a backlight control signal transmitted to the filtering unit according to the received current detection signal; the backlight control signal is used for representing the dimming mode of the backlight driver; the dimming mode comprises a pulse width modulation mode and a direct current dimming control mode.
One embodiment is that the pulse width modulation signal comprises a first pulse width modulation signal and a second pulse width modulation signal, and the duty ratio of the second pulse width modulation signal is integral multiple of the duty ratio of the first pulse width modulation signal; the backlight control signal comprises a first backlight control signal for indicating that the working mode of the filtering unit is the transmission mode or a second backlight control signal for indicating that the working mode of the filtering unit is the filtering mode; the dimming mode represented by the first backlight control signal is different from the dimming mode represented by the second backlight control signal;
after the first backlight control signal is transmitted to the filtering unit through the signal controller, the method further includes:
after the signal controller sends a first pulse width modulation signal to the filtering unit, the signal controller sends the backlight enabling signal to the backlight driver, and the signal controller receives a first current detection signal sent by the current detector;
after receiving the first current detection signal and sending the second pulse width modulation signal to the filtering unit through the signal controller, sending the backlight enable signal to the backlight driver through the signal controller, and receiving the second current detection signal sent by the current detector through the signal controller;
determining, by the signal controller, a backlight control signal transmitted to the filtering unit according to the received current detection signal, including:
and determining, by the signal controller, whether the backlight control signal transmitted to the filtering unit is the first backlight control signal according to the first current detection signal and the second current detection signal.
In one embodiment, the determining, by the signal controller, whether the backlight control signal sent to the filtering unit is the first backlight control signal according to the first current detection signal and the second current detection signal includes:
determining whether the first backlight control signal matches a dimming manner of the backlight driver according to the first current detection signal and the second current detection signal;
and determining whether the backlight control signal sent to the filtering unit is the first backlight control signal according to the matching result.
In one embodiment, the determining whether the first backlight control signal matches a dimming manner of the backlight driver according to the first current detection signal and the second current detection signal includes:
and if the difference value of the current value of the second current detection signal and the integral multiple of the current value of the first current detection signal is smaller than a set difference value, determining that the first backlight control signal is matched with the dimming mode of the backlight driver.
In one embodiment, the determining, according to the matching result, whether the backlight control signal sent to the filtering unit is the first backlight control signal includes:
if the matching result is that the first backlight control signal is matched with the dimming mode of the backlight driver, determining the backlight control signal sent to the filtering unit as the first backlight control signal;
if the matching result is that the first backlight control signal is not matched with the dimming mode of the backlight driver, sending a second backlight control signal to the filtering unit to determine whether the backlight control signal sent to the filtering unit is the second backlight control signal according to the received current detection signal.
In one embodiment, the operation mode includes a filtering mode and a transmission mode; determining, by the filtering unit, a working mode of the filtering unit according to the received backlight control signal, including:
if the backlight control signal is a signal representing the direct current dimming control mode, determining that the working mode is the filtering mode;
if the backlight control signal is a signal representing the pulse width modulation mode, determining that the working mode is the transmission mode;
under the determined working mode, processing the received pulse width modulation signal through the filtering unit to obtain a target modulation signal, and sending the target modulation signal to the backlight driver, including:
if the determined working mode is the filtering mode, filtering the pulse width modulation signal into a direct current modulation signal through the filtering unit, and sending the direct current modulation signal to the backlight driver as the target modulation signal;
and if the determined working mode is the transmission mode, sending the pulse width modulation signal as the target modulation signal to the backlight driver through the filtering unit.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A backlight control signal adaptive device is characterized in that the device comprises a signal controller, a current detector, a backlight driver and a filter unit; the output end of the signal controller is respectively connected with the backlight driver and the filtering unit, the input end of the signal controller is connected with the output end of the current detector, the input end of the current detector is connected with the output end of the backlight driver, and the output end of the filtering unit is connected with the input end of the backlight driver;
the signal controller is used for generating a pulse width modulation signal, a backlight enabling signal and a backlight control signal, sending the pulse width modulation signal and the backlight control signal to the filtering unit, and sending the backlight enabling signal to the backlight driver; determining a backlight control signal sent to the filtering unit according to the received current detection signal; the backlight control signal is used for representing the dimming mode of the backlight driver; the dimming mode comprises a pulse width modulation mode and a direct current dimming control mode;
the filtering unit is used for determining the working mode of the filtering unit according to the received backlight control signal; and under the determined working mode, processing the received pulse width modulation signal to obtain a target modulation signal, and sending the target modulation signal to the backlight driver;
the backlight driver is used for generating a backlight driving signal based on the received target modulation signal after receiving the backlight enabling signal and sending the backlight driving signal to the current detector;
the current detector is used for detecting the current of the received backlight driving signal, obtaining the current detection signal and sending the current detection signal to the signal controller;
wherein the pulse width modulation signal comprises a first pulse width modulation signal and a second pulse width modulation signal, and the duty ratio of the second pulse width modulation signal is integral multiple of the duty ratio of the first pulse width modulation signal; the backlight control signal comprises a first backlight control signal for indicating that the working mode of the filtering unit is a transmission mode or a second backlight control signal for indicating that the working mode of the filtering unit is a filtering mode; the dimming mode represented by the first backlight control signal is different from the dimming mode represented by the second backlight control signal;
after the signal controller sends the first backlight control signal to the filtering unit, the signal controller is specifically configured to:
after sending a first pulse width modulation signal to the filtering unit, sending the backlight enabling signal to the backlight driver, and receiving a first current detection signal sent by the current detector;
after receiving the first current detection signal and sending the second pulse width modulation signal to the filtering unit, sending the backlight enable signal to the backlight driver and receiving a second current detection signal sent by the current detector;
and determining whether the backlight control signal sent to the filtering unit is the first backlight control signal according to the first current detection signal and the second current detection signal.
2. The apparatus of claim 1, wherein the signal controller is specifically configured to:
determining whether the first backlight control signal matches a dimming manner of the backlight driver according to the first current detection signal and the second current detection signal;
and determining whether the backlight control signal sent to the filtering unit is the first backlight control signal according to the matching result.
3. The apparatus of claim 2, wherein the signal controller is specifically configured to:
and if the difference value of the current value of the second current detection signal and the integral multiple of the current value of the first current detection signal is smaller than a set difference value, determining that the first backlight control signal is matched with the dimming mode of the backlight driver.
4. The apparatus of claim 2, wherein the signal controller is specifically configured to:
if the matching result is that the first backlight control signal is matched with the dimming mode of the backlight driver, determining the backlight control signal sent to the filtering unit as the first backlight control signal;
if the matching result is that the first backlight control signal is not matched with the dimming mode of the backlight driver, sending a second backlight control signal to the filtering unit to determine whether the backlight control signal sent to the filtering unit is the second backlight control signal according to the received current detection signal.
5. The apparatus of any of claims 1-4, wherein the operating modes include a filtering mode and a transmission mode; the filtering unit is specifically configured to:
if the backlight control signal is a signal representing the direct current dimming control mode, determining that the working mode is the filtering mode, filtering the pulse width modulation signal into a direct current modulation signal, and sending the direct current modulation signal serving as the target modulation signal to the backlight driver;
and if the backlight control signal is a signal representing the pulse width modulation mode, determining that the working mode is the transmission mode, and sending the pulse width modulation signal to the backlight driver as the target modulation signal.
6. A backlight control signal adaptation method, comprising:
generating a pulse width modulation signal, a backlight enabling signal and a backlight control signal through a signal controller, sending the pulse width modulation signal and the backlight control signal to a filtering unit, and sending the backlight enabling signal to a backlight driver;
determining, by the filtering unit, a working mode of the filtering unit according to the received backlight control signal; processing the received pulse width modulation signal through the filtering unit under the determined working mode to obtain a target modulation signal, and sending the target modulation signal to the backlight driver;
after the backlight driver receives the backlight enabling signal, generating a backlight driving signal based on the received target modulation signal through the backlight driver, and sending the backlight driving signal to a current detector;
detecting the current of the received backlight driving signal through the current detector to obtain a current detection signal, and sending the current detection signal to the signal controller;
determining, by the signal controller, a backlight control signal transmitted to the filtering unit according to the received current detection signal; the backlight control signal is used for representing the dimming mode of the backlight driver; the dimming mode comprises a pulse width modulation mode and a direct current dimming control mode;
wherein the pulse width modulation signal comprises a first pulse width modulation signal and a second pulse width modulation signal, and the duty ratio of the second pulse width modulation signal is integral multiple of the duty ratio of the first pulse width modulation signal; the backlight control signal comprises a first backlight control signal for indicating that the working mode of the filtering unit is a transmission mode or a second backlight control signal for indicating that the working mode of the filtering unit is a filtering mode; the dimming mode represented by the first backlight control signal is different from the dimming mode represented by the second backlight control signal;
after sending the first backlight control signal to the filtering unit through the signal controller, the method further includes:
after the signal controller sends a first pulse width modulation signal to the filtering unit, the signal controller sends the backlight enabling signal to the backlight driver, and the signal controller receives a first current detection signal sent by the current detector;
after the first current detection signal is received and the second pulse width modulation signal is sent to the filtering unit through the signal controller, the backlight enabling signal is sent to the backlight driver through the signal controller, and the second current detection signal sent by the current detector is received through the signal controller;
determining, by the signal controller, a backlight control signal transmitted to the filtering unit according to the received current detection signal, including:
and determining, by the signal controller, whether the backlight control signal transmitted to the filtering unit is the first backlight control signal according to the first current detection signal and the second current detection signal.
7. The method of claim 6, wherein determining, by the signal controller, whether the backlight control signal sent to the filtering unit is the first backlight control signal according to the first current detection signal and the second current detection signal comprises:
determining whether the first backlight control signal matches a dimming manner of the backlight driver according to the first current detection signal and the second current detection signal;
and determining whether the backlight control signal sent to the filtering unit is the first backlight control signal according to the matching result.
8. The method of claim 7, wherein determining whether the first backlight control signal matches a dimming manner of the backlight driver according to the first current detection signal and the second current detection signal comprises:
and if the difference value of the current value of the second current detection signal and the integral multiple of the current value of the first current detection signal is smaller than a set difference value, determining that the first backlight control signal is matched with the dimming mode of the backlight driver.
9. The method of claim 7, wherein the determining whether the backlight control signal sent to the filtering unit is the first backlight control signal according to the matching result comprises:
if the matching result is that the first backlight control signal is matched with the dimming mode of the backlight driver, determining the backlight control signal sent to the filtering unit as the first backlight control signal;
and if the matching result is that the first backlight control signal is not matched with the dimming mode of the backlight driver, sending a second backlight control signal to the filtering unit so as to determine whether the backlight control signal sent to the filtering unit is the second backlight control signal according to the received current detection signal.
10. The method according to any one of claims 6 to 9, wherein the operating modes include a filtering mode and a transmission mode; determining, by the filtering unit, a working mode of the filtering unit according to the received backlight control signal, including:
if the backlight control signal is a signal representing the direct current dimming control mode, determining that the working mode is the filtering mode;
if the backlight control signal is a signal representing the pulse width modulation mode, determining that the working mode is the transmission mode;
under the determined working mode, processing the received pulse width modulation signal through the filtering unit to obtain a target modulation signal, and sending the target modulation signal to the backlight driver, including:
if the determined working mode is the filtering mode, filtering the pulse width modulation signal into a direct current modulation signal through the filtering unit, and sending the direct current modulation signal to the backlight driver as the target modulation signal;
and if the determined working mode is the transmission mode, sending the pulse width modulation signal as the target modulation signal to the backlight driver through the filtering unit.
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| CN103079313B (en) * | 2012-12-28 | 2015-11-04 | 广州市雷格斯光电科技有限公司 | For multi-mode light modulation and the multichannel independence constant-current drive circuit of LED illumination |
| CN107481679B (en) * | 2017-09-22 | 2023-05-19 | 合肥惠科金扬科技有限公司 | LED double-backlight control circuit and double-backlight LED device |
| CN108777133A (en) * | 2018-06-26 | 2018-11-09 | 广州视源电子科技股份有限公司 | Dimming circuit, backlight module and liquid crystal display device |
| JP2020136079A (en) * | 2019-02-20 | 2020-08-31 | セイコーエプソン株式会社 | Light-emitting control device, light source device and projection type video display device |
| CN110191540B (en) * | 2019-06-10 | 2021-10-26 | 京东方科技集团股份有限公司 | Dimming method and dimming device for LED and computer readable medium |
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