CN111402822A - Backlight brightness adjusting system, method and storage medium - Google Patents
Backlight brightness adjusting system, method and storage medium Download PDFInfo
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- CN111402822A CN111402822A CN202010378400.1A CN202010378400A CN111402822A CN 111402822 A CN111402822 A CN 111402822A CN 202010378400 A CN202010378400 A CN 202010378400A CN 111402822 A CN111402822 A CN 111402822A
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- 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
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Abstract
The application relates to the field of backlight brightness adjustment, and provides a backlight brightness adjusting system, a backlight brightness adjusting method and a storage medium. The system comprises: the backlight circuit comprises a backlight chip, a digital resistor and a light source, wherein the digital resistor and the light source are connected between a driving voltage and ground in series, and the control end of the digital resistor is connected with the main chip; the brightness detection module is used for detecting the ambient brightness; the main chip is used for outputting a first adjusting instruction and a second adjusting instruction to the backlight chip according to the environment brightness; the first adjusting instruction is used for controlling the backlight chip to adjust the driving voltage so as to perform first brightness adjustment on the light emission of the light source; the second adjusting instruction is used for adjusting the resistance value of the digital resistor so as to perform second brightness adjustment on the light emission of the light source. By adopting the system, the backlight brightness adjusting range can be improved.
Description
Technical Field
The present invention relates to the field of backlight adjustment technologies, and in particular, to a backlight brightness adjustment system, method, and storage medium.
Background
A mobile phone portable device using a Thin Film Transistor liquid Crystal Display (Thin Film Transistor-L acquired Crystal Display, TFT-L CD) usually needs to use a boost backlight circuit to boost the battery voltage to drive L CD backlight to operate.
In the prior art, a mobile phone main Chip (CPU) generally adjusts an output Pulse Width Modulation (PWM) wave to control a pin of a backlight chip in a backlight circuit, so as to cause a change in a current flowing through a light source in the backlight circuit.
However, the adjustment mode controls the backlight brightness adjustment within a certain range, and is not careful when meeting the special environmental requirements. For example, in a dark environment, the backlight brightness is adjusted to the minimum, and a glaring phenomenon still occurs; under sunlight, the backlight brightness is adjusted to the maximum or is insufficient, and the screen is difficult to see.
Disclosure of Invention
The invention provides a backlight brightness adjusting system, a backlight brightness adjusting method and a storage medium, which are used for improving the backlight brightness adjusting range.
The embodiment of the application provides a backlight brightness adjusting system, including:
the backlight circuit comprises a backlight chip, a digital resistor and a light source, wherein the digital resistor and the light source are connected between a driving voltage and ground in series, and the control end of the digital resistor is connected with the main chip;
the brightness detection module is used for detecting the ambient brightness;
the main chip is used for outputting a first adjusting instruction and a second adjusting instruction to the backlight chip according to the environment brightness;
the first adjusting instruction is used for controlling the backlight chip to adjust the driving voltage so as to perform first brightness adjustment on the light emission of the light source; the second adjusting instruction is used for adjusting the resistance value of the digital resistor so as to perform second brightness adjustment on the light emission of the light source.
In one embodiment, further comprising: the device comprises a brightness judging module and a switch module;
the brightness judging module is used for judging whether the ambient brightness meets a preset condition so as to obtain a judgment result;
the switch module is electrically connected between the main chip and the control end of the digital resistor and used for being connected or disconnected according to the judgment result.
In one embodiment, the digital resistor comprises a controller, a nonvolatile memory, a digital potentiometer and a resistance module, wherein the controller is electrically connected with the nonvolatile memory, the digital potentiometer and the resistance module respectively, and the digital potentiometer is electrically connected with the resistance module.
In one embodiment, the backlight circuit further comprises: the backlight chip comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin;
one end of the first capacitor is connected with the first pin of the backlight chip, and the other end of the first capacitor is grounded;
one end of the second capacitor is connected with a second pin of the backlight chip, and the other end of the second capacitor is grounded;
one end of the third capacitor is connected with the cathode of the voltage stabilizing diode, and the other end of the third capacitor is grounded;
two ends of the inductor are respectively connected with the first pin of the backlight chip and the third pin of the backlight chip;
the anode of the voltage stabilizing diode is connected with a third pin of the backlight chip, and the cathode of the voltage stabilizing diode is connected with one end of the light source connected with the driving voltage;
the backlight power supply is connected with a first pin of the backlight chip;
the fourth pin of the backlight chip is connected with the main chip; a fifth pin of the backlight chip is connected with a node between the digital resistor and the light source; and the sixth pin of the backlight chip is grounded.
In one embodiment, the resistor module comprises: the circuit comprises a plurality of resistors which are connected in series and have the same resistance, reference voltage and analog switches of which the number is corresponding to that of the resistors;
a plurality of the resistors are connected in series to the reference voltage;
the analog switches are connected with the resistors in a one-to-one correspondence mode and used for being switched on according to control signals of the controller, so that at least 1 resistor is connected to the anode of the digital potentiometer.
In one embodiment, the backlight circuit further comprises a current stabilizing circuit for stabilizing a current flowing through the light source.
In one embodiment, the backlight circuit further comprises an overheating protection circuit for limiting the total power dissipation of the backlight circuit.
In one embodiment, the analog switch is a MOS transistor.
The embodiment of the application provides a backlight brightness adjusting method, which comprises the following steps:
obtaining the ambient brightness;
outputting a first adjusting instruction and a second adjusting instruction according to the ambient brightness;
controlling a backlight chip to adjust the driving voltage of the light source according to the first adjusting instruction so as to perform first brightness adjustment on the light emission of the light source;
and adjusting the resistance value of a digital resistor connected in series with the light source according to the second adjusting instruction so as to perform second brightness adjustment on the light emission of the light source.
In an embodiment, the adjusting the resistance value of the digital resistor according to the second adjustment instruction to perform the second brightness adjustment on the light emission of the light source includes:
detecting whether the acquired ambient brightness meets a preset condition;
if not, the resistance value of the digital resistor in the backlight circuit is maintained as the default resistance value;
and adjusting the resistance value of the digital resistor according to the second adjusting instruction so as to perform second brightness adjustment on the light emission of the light source.
The embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the backlight brightness adjusting method provided in any embodiment of the present application.
According to the backlight brightness adjusting system, the backlight brightness adjusting method and the storage medium, on the basis of adjusting the backlight brightness by changing the PWM wave, the fixed value resistor connected with the light source in series in the backlight circuit is replaced by the digital resistor, the backlight brightness is adjusted by adjusting the resistance value of the digital resistor according to the environment brightness, the brightness adjustment of the terminal screen under the special environment (the terminal is in the sunshine or the terminal is in the dark) can exceed the original adjusting range, the problem of poor user experience of the existing backlight brightness adjusting technology under the special brightness environment is solved, and the effect of improving the backlight brightness adjusting range is achieved.
Drawings
Fig. 1 is a schematic structural diagram of a backlight brightness adjusting system according to an embodiment of the invention.
FIG. 2 is a diagram illustrating components of a backlight adjusting system according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a backlight brightness adjusting system according to an embodiment of the invention.
Fig. 4 is a schematic structural diagram of a digital resistor according to an embodiment of the invention.
Fig. 5 is a schematic diagram of the components of a digital resistor according to an embodiment of the invention.
Fig. 6 is a schematic structural diagram of a backlight brightness adjusting system according to an embodiment of the invention.
Fig. 7 is a schematic structural diagram of a backlight brightness adjusting system according to an embodiment of the invention.
Fig. 8 is a flowchart of a backlight brightness adjusting method according to an embodiment of the invention.
Fig. 9 is a flowchart of a backlight brightness adjusting method according to an embodiment of the invention.
Fig. 10 is an internal structural diagram of a computer device in an 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 adjustment instruction may be referred to as a second adjustment instruction, and similarly, the second adjustment instruction may be referred to as the first adjustment instruction, without departing from the scope of the present application. Both the first and second adjustment instructions are adjustment instructions, but they are not the same adjustment instruction. 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.
In an embodiment, as shown in fig. 1, a schematic structural diagram of a backlight brightness adjusting system is provided in an embodiment of the present invention, where the embodiment is applicable to a backlight brightness adjusting situation, the method may be executed by the backlight brightness adjusting system, the system may be integrated on a terminal, and the terminal may be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, and portable wearable devices.
The backlight brightness adjusting system provided by the embodiment may include: the backlight circuit 3 comprises a backlight chip 31, a digital resistor 32 and a light source 33, wherein the digital resistor 32 and the light source 33 are connected in series between a driving voltage and ground, and the control end of the digital resistor 32 is connected with the main chip 2.
The brightness detection module 1 is used for detecting the ambient brightness.
The main chip 2 is configured to output a first adjustment instruction and a second adjustment instruction to the backlight chip 31 according to the ambient brightness.
The first adjustment instruction is used for controlling the backlight chip 31 to adjust the driving voltage so as to perform first brightness adjustment on the light emission of the light source 33; the second adjustment instruction is used to adjust the resistance value of the digital resistor 32 to perform a second brightness adjustment on the light emitted by the light source 33.
In this embodiment, the brightness detection module 1 detects the ambient brightness around the terminal where the backlight brightness adjustment system is located, for example, the brightness detection module 1 may be a photosensitive sensor or the like carried by the terminal, and is not limited herein. The main chip 2 of the terminal receives the ambient brightness sent by the brightness detection module, and outputs a first adjustment instruction for controlling the backlight chip 31 to adjust the driving voltage of the light source 33 and a second adjustment instruction for adjusting the resistance value of the digital resistor according to the change of the ambient brightness, for example, the main chip 2 can adjust the output Pulse Width Modulation (PWM) wave to control the operation of the backlight chip 31 so as to adjust the driving voltage of the light source 33 and perform the first brightness adjustment on the light emitted by the light source 33, the PWM wave takes each Pulse train with equal Pulse Width as a PWM waveform, the frequency can be adjusted by changing the period of the Pulse train, the voltage can be adjusted by changing the Width or duty ratio of the Pulse, and the voltage and the frequency can be changed in a coordinated manner by adopting a proper control method. The purpose of controlling the magnitude of the current flowing through the light source 33 can be achieved by adjusting the period of the PWM and the duty ratio of the PWM to adjust the driving voltage of the light source 33; the main chip 2 may also adjust the resistance of the digital resistor 32 directly according to the change of the ambient brightness and the preset mapping relationship between the ambient brightness and the resistance of the digital resistor, so as to affect the magnitude of the current flowing through the light source 33, and perform the second brightness adjustment on the light emitted from the light source 33, where the larger the resistance of the exemplary digital resistor 32 is, the lower the brightness of the light source 33 is, and the smaller the resistance of the digital resistor 32 is, the higher the brightness of the light source 33 is.
According to the technical scheme of the embodiment of the invention, on the basis of adjusting the backlight brightness by changing the PWM wave, the fixed value resistor connected with the light source in series in the backlight circuit is replaced by the digital resistor, and the backlight brightness is adjusted by adjusting the resistance value of the digital resistor according to the environment brightness, so that the problem of poor user experience of the conventional backlight brightness adjusting technology in a special brightness environment is solved, and the effect of improving the backlight brightness adjusting range is achieved.
In an embodiment, as shown in the schematic diagram of the elements of the backlight adjusting system shown in fig. 2, the backlight circuit 3 further includes: a first capacitor CINA second capacitor CCOMPThe backlight chip 31 comprises a first pin VIN, a second pin COMP, a third pin SW, a fourth pin CTR L, a fifth pin FB and a sixth pin GND;
the first capacitor CINOne end of the first pin is connected to the first pin VIN of the backlight chip 31, and the other end is grounded;
the second capacitor CCOMPOne end of the second pin is connected to the second pin COMP of the backlight chip 31, and the other end is grounded;
one end of the third capacitor C1 is connected with the cathode of the zener diode D1, and the other end is grounded;
two ends of the inductor L are respectively connected to the first pin of the backlight chip 31 and the third pin SW of the backlight chip 31;
the anode of the zener diode D1 is connected to the third pin SW of the backlight chip 31, and the cathode of the zener diode D1 is connected to one end of the light source 33 connected to the driving voltage;
the backlight power VCC is connected to a first pin VIN of the backlight chip 31;
the fourth pin CTR L of the backlight chip 31 is connected to the main chip 2, the fifth pin FB of the backlight chip 31 is connected to the node between the digital resistor 32 and the light source 33, and the sixth pin GND of the backlight chip 31 is grounded.
In this embodiment, the backlight power source may be a 5V power source. A first capacitor CINCan be 22 muF, and a second capacitor CCOMPMay be 220nF, and the third capacitance C1 may beThe first adjustment command output by the main chip 2 according to the ambient brightness is input to the backlight chip 31 through the fourth pin CTR L of the backlight chip 31, the first adjustment command is a frequency-adjustable PWM wave, that is, a switch connected to the third pin SW inside the backlight chip 31 is turned on or off at a corresponding frequency according to the pulse frequency of the PWM wave, so as to change charging and discharging of the inductor L, adjust the change of the driving voltage input to the light source 33 from the diode cathode, and adjust the brightness of the light source 33, the third capacitor C1 may filter the driving voltage, the second adjustment command output by the main chip 2 according to the ambient brightness may be directly input to the control terminal of the digital resistor 32 through I2C (or SPI) to adjust the resistance value of the digital resistor 32.
According to the technical scheme of the embodiment of the invention, the third capacitor, the inductor, the voltage stabilizing diode, the backlight power supply and the backlight chip are combined to form the DC/DC converter, so that the driving voltage of the driving light source is conveniently adjusted.
In an embodiment, as shown in fig. 3, a schematic structural diagram of a backlight brightness adjusting system, the backlight brightness adjusting system of this embodiment further includes: a brightness judging module 4 and a switch module 5;
the brightness judging module 4 is configured to judge whether the ambient brightness meets a preset condition to obtain a judgment result;
the switch module 5 is electrically connected between the main chip 2 and the control end of the digital resistor 32, and the switch module 5 is configured to be turned on or off according to the determination result.
In this embodiment, the brightness determination module 4 is electrically connected to the brightness detection module 1, and can determine whether the ambient brightness detected by the brightness detection module 1 meets a preset condition, for example, whether the ambient brightness exceeds a first brightness threshold, that is, the terminal is in the sunshine and the screen is not clearly seen; and judging whether the ambient brightness is lower than a second brightness threshold value, namely, the terminal is still dazzling due to limited adjustment range of the screen brightness in the dark environment. That is, the determination result includes a determination as to whether the ambient brightness exceeds the first brightness threshold and whether the ambient brightness is lower than the second brightness threshold. The switch module 5 may perform a process of turning on or off the connectivity between the main chip 2 and the control terminal of the digital resistor 32 according to the determination result. For example, when the ambient brightness is greater than the second brightness threshold and less than the first brightness threshold, the resistance of the digital resistor 32 is adjusted to the default resistance, and the switch module 5 is turned off, the second adjustment instruction of the main chip 2 cannot adjust the resistance of the digital resistor; when the ambient brightness is smaller than the second brightness threshold or larger than the first brightness threshold, the switch module 5 is turned on, that is, the digital resistor 32 receives the adjustment of the resistance value thereof by the main chip 2.
According to the technical scheme of the embodiment of the invention, whether the ambient brightness meets the preset condition is judged through a brightness judging module so as to obtain a judging result; the switch module connected between the main chip and the control end of the digital resistor is connected or disconnected according to the judgment result, and the brightness adjusting range of the terminal screen is adjusted only in a special environment (the terminal is in the sunlight or the terminal is in the dark), so that the effect of saving more electricity is achieved.
In an embodiment, as shown in the structural diagram of the digital resistor shown in fig. 4, the digital resistor 32 includes a controller 321, a nonvolatile memory 322, a digital potentiometer 323 and a resistance module 324, the controller 321 is electrically connected to the nonvolatile memory 322, the digital potentiometer 323 and the resistance module 324, respectively, and the digital potentiometer 323 is electrically connected to the resistance module 324.
In this embodiment, the controller 321 is electrically connected to the nonvolatile memory 322, and the controller 321 can receive the second adjustment instruction to perform read/write operations on the nonvolatile memory 322. The controller 321 directly sends the switch control signal identified according to the second adjustment instruction to the resistor module 324 to control the switch array of the resistor module 324, and the switch signal is stored in the nonvolatile memory 322, when the circuit is powered up again after power failure, the original control data is still stored in the digital resistor, and the resistance value between the middle tap and the two terminals is still the last adjustment result. Also stored in the non-volatile memory 322 is a default resistance value for the digital resistor when the terminal is not in a particular environment.
According to the technical scheme of the embodiment of the invention, the original control data is stored in the nonvolatile memory in the digital resistor, so that the effect that the resistance value of the digital resistor needs to be readjusted when the power is lost and is re-electrified is realized.
In one embodiment, as shown in the schematic diagram of the digital resistor shown in fig. 5, the resistor module 324 includes: the device comprises a plurality of resistors R which are connected in series and have the same resistance, a reference voltage REF and analog switches K which are in number corresponding to the resistors R;
a plurality of the resistors R are connected in series to the reference voltage REF;
the analog switches K are connected with the resistors R in a one-to-one correspondence manner, and are used for switching on according to a control signal of the controller 321, so as to connect at least 1 resistor R to the anode of the digital potentiometer 323;
the negative electrode of the digital potentiometer 323 is connected with the output end of the digital potentiometer 323;
the control end of the controller 321 is connected to the nonvolatile memory 322, the output end of the digital potentiometer 323 and the input end of the resistor module 324;
the input end of the resistor module 324 is connected to the output end of the digital potentiometer 323.
In this embodiment, a plurality of resistors R having the same or different resistance values are connected in series, except for the resistor connected to the reference voltage REF, two ends of each resistor are connected together through an analog switch as a tap of a digital potentiometer (DCP), a negative electrode of the digital potentiometer 323 is connected to an output end of the digital potentiometer 323, a control end of the controller 321 is connected to the nonvolatile memory 322, an output end of the digital potentiometer 323, and an input end of the resistor module 324 is connected to an output end of the digital potentiometer 323. The analog switch K of the present embodiment is equivalent to a single-force single-throw switch, and only one analog switch K can be closed at a time under the control of a digital signal, so that one node of the middle-link resistor is connected to the sliding end. Assuming that the digital potentiometer is 16 taps, the step size is 660 Ω, i.e., each resistor R is 660 Ω, and the output resistance increases by 660 Ω for each step of the sliding end, i.e., for each step of the closed position of the analog switch K. Considering that the sliding end is in any position, an analog switch K follows, and the resistance value of the analog switch K is the sliding end resistance and the initial resistance of the digital potentiometer. Assuming that the sliding end resistance is 100 Ω, the sliding end reaches the Rh end when moving 15 steps, and the output resistance of the digital resistor 32 should be 100 Ω +660 Ω x15 — 10k Ω. Optionally, the analog switch K may be an MOS transistor or a triode, and the signal link is turned off or on by using a switching mode of the MOS transistor; because its function is similar to a switch, but is realized by the characteristics of an analog device, the switch becomes an analog switch.
According to the technical scheme of the embodiment of the invention, the resistance value of the digital resistor is adjusted by using the analog switch, so that the effects of low power consumption, high speed, no mechanical contact, small volume and long service life are realized.
In an embodiment, as shown in fig. 6, the backlight brightness adjusting system further includes a current stabilizing circuit 34 for stabilizing the current flowing through the light source 33.
According to the technical scheme of the embodiment of the invention, the backlight circuit is provided with the current stabilizing circuit, so that the effect of keeping the output voltage basically unchanged when the input voltage fluctuates or the load changes is achieved.
In an embodiment, as shown in fig. 7, the backlight brightness adjusting system further includes an overheat protection circuit 35 for limiting the total power dissipation of the backlight circuit in the backlight circuit 3.
According to the technical scheme of the embodiment of the invention, the overheating protection circuit is arranged in the backlight circuit, so that the effect of avoiding abnormal operation or fault caused by heat generated by energy conversion or friction in the operation of the electronic equipment is achieved.
In an embodiment, as shown in the flowchart of the backlight brightness adjusting method shown in fig. 8, the present embodiment is applicable to a backlight brightness adjusting situation, and the method may be executed by a backlight brightness adjusting system, which may be integrated on a terminal, such as a smart phone, a tablet computer, a Personal Computer (PC), a learning machine, and the like. The method comprises the following steps:
s810, obtaining the ambient brightness;
in this embodiment, the ambient brightness is the brightness of the environment where the terminal where the backlight brightness adjustment system is located, and may be obtained by a photosensor provided in the terminal.
S820, outputting a first adjusting instruction and a second adjusting instruction according to the ambient brightness;
in this embodiment, the first adjustment instruction is a control instruction for the backlight chip according to a change in ambient brightness; the second adjustment instruction is a control instruction for adjusting the resistance value of the digital resistor according to the ambient brightness and the backlight requirement.
S830, controlling a backlight chip to adjust the driving voltage of the light source according to the first adjusting instruction so as to perform first brightness adjustment on the light emission of the light source;
in this embodiment, the terminal main chip controls the brightness output by the backlight circuit by outputting the first adjustment instruction, that is, the PWM wave. When the duty ratio of the PWM wave is increased, the brightness output by the backlight circuit is increased; when the duty ratio of the PWM wave is reduced, the luminance of the backlight circuit is reduced.
And S840, adjusting the resistance value of a digital resistor connected in series with the light source according to the second adjusting instruction so as to adjust the light emission of the light source for second brightness.
In this embodiment, the terminal main chip may change the resistance of the digital resistor by outputting the second adjustment instruction to affect the brightness output by the backlight circuit. The larger the resistance value of the digital resistor is, the lower the output brightness of the backlight circuit is; the smaller the resistance value of the digital resistor is, the maximum brightness is output by the backlight circuit.
According to the technical scheme, the driving voltage of the light source is adjusted by controlling the backlight chip according to the environment brightness output, so that a first adjusting instruction for performing first brightness adjustment on the light emission of the light source and the resistance value of the digital resistor connected in series with the light source are adjusted, and a second adjusting instruction for performing second brightness adjustment on the light emission of the light source is output, so that the brightness adjustment on the terminal screen can exceed the original adjusting range in a special environment (the terminal is in the sun or the terminal is in the dark), the problem of poor user experience in the special brightness environment by the conventional backlight brightness adjusting technology is solved, and the effect of improving the backlight brightness adjusting range is achieved.
In an embodiment, as shown in the flowchart of the backlight brightness adjusting method shown in fig. 9, the method is further optimized based on the previous embodiment, and includes:
s910, obtaining the ambient brightness;
s920, outputting a first adjusting instruction and a second adjusting instruction according to the environment brightness;
s930, controlling a backlight chip to adjust the driving voltage of the light source according to the first adjusting instruction so as to perform first brightness adjustment on the light emission of the light source;
s940, detecting whether the acquired environment brightness meets a preset condition;
in this embodiment, the preset condition is whether the current ambient brightness is in a special environment (the terminal is in the sunlight or the terminal is in the dark), for example, it may be determined whether the ambient brightness exceeds a first brightness threshold, that is, the terminal is in the sunlight and the screen is not clearly seen; and judging whether the ambient brightness is lower than a second brightness threshold value, namely, the terminal is still dazzling due to limited adjustment range of the screen brightness in the dark environment.
S950, if not, the resistance value of the digital resistor in the backlight circuit is maintained as the default resistance value;
in this embodiment, when the ambient brightness is greater than the second brightness threshold and less than the first brightness threshold, the resistance of the digital resistor is adjusted to the default resistance, and the switch module is turned off, so that the second adjustment instruction of the main chip cannot adjust the resistance of the digital resistor.
And S960, adjusting the resistance value of the digital resistor according to the second adjusting instruction to perform second brightness adjustment on the light emitted by the light source.
In this embodiment, when the ambient brightness is smaller than the second brightness threshold or larger than the first brightness threshold, the switch module is turned on, that is, the digital resistor adjusts the resistance value according to the second adjustment instruction.
The technical scheme of the embodiment of the invention judges whether the ambient brightness meets the preset condition; if not, the resistance value of the digital resistor in the backlight circuit is maintained as the default resistance value; the resistance value of the digital resistor is adjusted according to the second adjusting instruction so as to adjust the light emitting of the light source for the second brightness, and the brightness adjusting range of the terminal screen is adjusted only in a special environment (the terminal is in the sunlight or the terminal is in the dark), so that the effect of saving more electricity is achieved.
It should be understood that although the various steps in the flow charts of fig. 8-9 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise.
In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 10. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing backlight brightness adjustment data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a backlight brightness adjustment method.
Those skilled in the art will appreciate that the architecture shown in figure Y is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as a particular computing device may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
obtaining the ambient brightness;
outputting a first adjusting instruction and a second adjusting instruction according to the ambient brightness;
controlling a backlight chip to adjust the driving voltage of the light source according to the first adjusting instruction so as to perform first brightness adjustment on the light emission of the light source;
and adjusting the resistance value of a digital resistor connected in series with the light source according to the second adjusting instruction so as to perform second brightness adjustment on the light emission of the light source.
In one embodiment, the computer program when executed by the processor further performs the steps of: the adjusting the resistance value of the digital resistor according to the second adjusting instruction to perform second brightness adjustment on the light emission of the light source comprises:
detecting whether the acquired ambient brightness meets a preset condition;
if not, the resistance value of the digital resistor in the backlight circuit is maintained as the default resistance value;
and adjusting the resistance value of the digital resistor according to the second adjusting instruction so as to perform second brightness adjustment on the light emission of the light source.
According to the technical scheme, the driving voltage of the light source is adjusted by controlling the backlight chip according to the environment brightness output, so that a first adjusting instruction for performing first brightness adjustment on the light emission of the light source and the resistance value of the digital resistor connected in series with the light source are adjusted, and a second adjusting instruction for performing second brightness adjustment on the light emission of the light source is output, so that the brightness adjustment on the terminal screen can exceed the original adjusting range in a special environment (the terminal is in the sun or the terminal is in the dark), the problem of poor user experience in the special brightness environment by the conventional backlight brightness adjusting technology is solved, and the effect of improving the backlight brightness adjusting range is achieved.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. Non-volatile memory may include Read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM is available in many forms, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), and the like.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
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 (10)
1. A backlight brightness adjustment system, comprising: the backlight circuit comprises a backlight chip, a digital resistor and a light source, wherein the digital resistor and the light source are connected between a driving voltage and ground in series, and the control end of the digital resistor is connected with the main chip;
the brightness detection module is used for detecting the ambient brightness;
the main chip is used for outputting a first adjusting instruction and a second adjusting instruction to the backlight chip according to the environment brightness;
the first adjusting instruction is used for controlling the backlight chip to adjust the driving voltage so as to perform first brightness adjustment on the light emission of the light source; the second adjusting instruction is used for adjusting the resistance value of the digital resistor so as to perform second brightness adjustment on the light emission of the light source.
2. The system of claim 1, further comprising: the device comprises a brightness judging module and a switch module;
the brightness judging module is used for judging whether the ambient brightness meets a preset condition so as to obtain a judgment result;
the switch module is electrically connected between the main chip and the control end of the digital resistor and used for being connected or disconnected according to the judgment result.
3. The system of claim 1, wherein the digital resistor comprises a controller, a non-volatile memory, a digital potentiometer and a resistor module, the controller is electrically connected to the non-volatile memory, the digital potentiometer and the resistor module, respectively, and the digital potentiometer is electrically connected to the resistor module.
4. The system of claim 1, wherein the backlight circuit further comprises: the backlight chip comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin;
one end of the first capacitor is connected with the first pin of the backlight chip, and the other end of the first capacitor is grounded;
one end of the second capacitor is connected with a second pin of the backlight chip, and the other end of the second capacitor is grounded;
one end of the third capacitor is connected with the cathode of the voltage stabilizing diode, and the other end of the third capacitor is grounded;
two ends of the inductor are respectively connected with the first pin of the backlight chip and the third pin of the backlight chip;
the anode of the voltage stabilizing diode is connected with a third pin of the backlight chip, and the cathode of the voltage stabilizing diode is connected with one end of the light source connected with the driving voltage;
the backlight power supply is connected with a first pin of the backlight chip;
the fourth pin of the backlight chip is connected with the main chip; a fifth pin of the backlight chip is connected with a node between the digital resistor and the light source; and the sixth pin of the backlight chip is grounded.
5. The system of claim 3, wherein the resistor module comprises: the circuit comprises a plurality of resistors which are connected in series and have the same resistance, reference voltage and analog switches of which the number is corresponding to that of the resistors;
a plurality of the resistors are connected in series to the reference voltage;
the analog switches are connected with the resistors in a one-to-one correspondence mode and used for being switched on according to control signals of the controller, so that at least 1 resistor is connected to the anode of the digital potentiometer.
6. The system of claim 4, wherein the backlight circuit further comprises a current regulation circuit for regulating the current flowing through the light source.
7. The system of claim 4, wherein the backlight circuit further comprises an over-temperature protection circuit for limiting the total power dissipation of the backlight circuit.
8. A backlight brightness adjusting method is characterized by comprising the following steps:
obtaining the ambient brightness;
outputting a first adjusting instruction and a second adjusting instruction according to the ambient brightness;
controlling a backlight chip to adjust the driving voltage of the light source according to the first adjusting instruction so as to perform first brightness adjustment on the light emission of the light source;
and adjusting the resistance value of a digital resistor connected in series with the light source according to the second adjusting instruction so as to perform second brightness adjustment on the light emission of the light source.
9. The method of claim 8, wherein adjusting the resistance of the digital resistor according to the second adjustment command to perform a second brightness adjustment on the light emitted by the light source comprises:
detecting whether the acquired ambient brightness meets a preset condition;
if not, the resistance value of the digital resistor in the backlight circuit is maintained as the default resistance value;
and adjusting the resistance value of the digital resistor according to the second adjusting instruction so as to perform second brightness adjustment on the light emission of the light source.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 8 to 9.
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| CN202010378400.1A CN111402822A (en) | 2020-05-07 | 2020-05-07 | Backlight brightness adjusting system, method and storage medium |
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| CN202010378400.1A CN111402822A (en) | 2020-05-07 | 2020-05-07 | Backlight brightness adjusting system, method and storage medium |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112365812A (en) * | 2020-11-10 | 2021-02-12 | 厦门天马微电子有限公司 | Light emitting module, light emitting panel and light emitting panel brightness uniformity processing method |
| CN113421531A (en) * | 2021-06-28 | 2021-09-21 | 深圳市华星光电半导体显示技术有限公司 | Backlight brightness adjusting circuit and electronic device |
| CN113674686A (en) * | 2021-08-17 | 2021-11-19 | 晟合微电子(肇庆)有限公司 | Brightness adjusting circuit, brightness adjusting method and display panel |
| CN113932919A (en) * | 2021-10-08 | 2022-01-14 | 杭州涂鸦信息技术有限公司 | Ambient light detection circuit, ambient light detection method, computer device, and readable storage medium |
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2020
- 2020-05-07 CN CN202010378400.1A patent/CN111402822A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112365812A (en) * | 2020-11-10 | 2021-02-12 | 厦门天马微电子有限公司 | Light emitting module, light emitting panel and light emitting panel brightness uniformity processing method |
| CN113421531A (en) * | 2021-06-28 | 2021-09-21 | 深圳市华星光电半导体显示技术有限公司 | Backlight brightness adjusting circuit and electronic device |
| CN113421531B (en) * | 2021-06-28 | 2022-09-27 | 深圳市华星光电半导体显示技术有限公司 | Backlight brightness adjusting circuit and electronic device |
| CN113674686A (en) * | 2021-08-17 | 2021-11-19 | 晟合微电子(肇庆)有限公司 | Brightness adjusting circuit, brightness adjusting method and display panel |
| CN113932919A (en) * | 2021-10-08 | 2022-01-14 | 杭州涂鸦信息技术有限公司 | Ambient light detection circuit, ambient light detection method, computer device, and readable storage medium |
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