CN111243532B - Backlight control method and display device - Google Patents
Backlight control method and display device Download PDFInfo
- Publication number
- CN111243532B CN111243532B CN202010058006.XA CN202010058006A CN111243532B CN 111243532 B CN111243532 B CN 111243532B CN 202010058006 A CN202010058006 A CN 202010058006A CN 111243532 B CN111243532 B CN 111243532B
- Authority
- CN
- China
- Prior art keywords
- value
- backlight
- pwm
- backlight module
- dimming
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The application discloses a backlight control method and display equipment. In the application, after a boot program is started, a backlight controller acquires a PWM initial value for backlight control stored in boot configuration information and acquires a backlight module dimming value, and determines a brightness value of a light bar in a backlight module according to the PWM initial value and the backlight module dimming value, so that the light bar in the backlight module adjusts the brightness according to the brightness value; after the middleware is started, the backlight controller obtains a user backlight PWM value written into the startup configuration information by the middleware according to a current signal source during startup, and responds to the user backlight PWM corresponding to the PWM initial value and keeps the brightness value of the light bar in the backlight module unchanged. And the PWM initial value is written in by the middleware according to the PWM value corresponding to the signal source when the display equipment is shut down last time.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a backlight control method and a display device.
Background
As a form of illumination, a backlight is often used as a providing module for screen brightness. Backlights are illuminated from the side or from the back to increase the illumination in low light environments and are widely used in display devices such as televisions, computers, and the like.
The basic principle of backlight brightness adjustment is as follows: the supply voltage of the backlight module is adjusted through a Pulse Width Modulation (PWM) signal, and the brightness adjustment of the backlight is realized through a method of increasing or decreasing the voltage. The brightness flicker degree in the backlight brightness adjusting process can directly influence the use experience of users.
How to reduce the backlight flicker in the process of starting up the device is a technical problem to be solved at present.
Disclosure of Invention
The embodiment of the application provides a backlight control method and display equipment, which are used for reducing backlight flicker in the process of starting up the equipment, so that user experience is improved.
In a first aspect, a backlight control method is provided, including:
after a boot program is started, a backlight controller acquires a PWM initial value for backlight control stored in startup configuration information and acquires a backlight module dimming value, and determines a brightness value of a light bar in the backlight module according to the PWM initial value and the backlight module dimming value, so that the light bar in the backlight module adjusts the brightness according to the brightness value; the PWM initial value is written in by the middleware according to the PWM value corresponding to the signal source when the display equipment is shut down last time;
after the middleware is started, the backlight controller obtains a user backlight PWM value written into the startup configuration information by the middleware according to a current signal source during startup, and responds to the user backlight PWM corresponding to the PWM initial value and keeps the brightness value of the light bar in the backlight module unchanged.
Optionally, the method further comprises: and responding to the shutdown of the display equipment, and storing the PWM value corresponding to the current signal source when the display equipment is shut down into the startup configuration information.
Optionally, the method further comprises: after the kernel is initialized, the backlight controller obtains a backlight module dimming value initialized by the kernel, and executes at least one backlight module dimming value updating step according to a preset step value until the target backlight module dimming value is the same as the backlight module dimming value initialized by the kernel; wherein, the backlight module dimming value updating step comprises: and determining an updated target backlight module dimming value according to the stepping value and the backlight module dimming value before updating, and determining the brightness value of the light bar in the backlight module according to the target backlight module dimming value, so that the light bar in the backlight module adjusts the brightness according to the brightness value.
Optionally, the backlight module dimming value comprises a dimming value of each partition of the backlight module; the determining the brightness value of the light bar in the backlight module according to the PWM initial value and the dimming value of the backlight module comprises: and determining the brightness value of each light bar in the backlight module according to the PWM initial value and the dimming value of each partition of the backlight module.
In a second aspect, there is provided a display device comprising:
the backlight controller is used for acquiring a PWM initial value for backlight control stored in the startup configuration information and acquiring a backlight module dimming value after a boot program is started, determining the brightness value of a light bar in the backlight module according to the PWM initial value and the backlight module dimming value, and outputting the brightness value to the driving module; the PWM initial value is written in by the middleware according to the PWM value corresponding to the signal source when the display equipment is shut down last time;
the driving module is used for outputting driving current to the lamp strip in the backlight module according to the brightness value so as to adjust the brightness of the lamp strip;
the backlight controller is further configured to, after the middleware is started, acquire a user backlight PWM value written in the startup configuration information by the middleware according to a current signal source at startup, determine that the PWM initial value is the same as the user backlight PWM value, and keep a brightness value of a light bar in the backlight module at present unchanged.
Optionally, the middleware is specifically configured to: and responding to the shutdown of the display equipment, and storing the PWM value corresponding to the current signal source when the display equipment is shut down into the startup configuration information.
Optionally, the backlight controller is further configured to: after the kernel is initialized, acquiring a backlight module dimming value initialized by the kernel, and executing at least one backlight module dimming value updating step according to a preset step value until the target backlight module dimming value is the same as the backlight module dimming value initialized by the kernel; wherein, the backlight module dimming value updating step comprises: and determining an updated target backlight module dimming value according to the stepping value and the backlight module dimming value before updating, and determining the brightness value of the light bar in the backlight module according to the target backlight module dimming value, so that the light bar in the backlight module adjusts the brightness according to the brightness value.
Optionally, the backlight module dimming value comprises a dimming value of each partition of the backlight module; the backlight controller is specifically configured to: and determining the brightness value of each light bar in the backlight module according to the PWM initial value and the dimming value of each partition of the backlight module.
In a third aspect, there is provided a display device comprising: a processor, a memory; the memory to store computer instructions; the processor, coupled with the memory, configured to execute the computer instructions to implement the method of any of the first aspects described above.
In a fourth aspect, there is provided a computer readable storage medium storing computer instructions which, when executed by a processor, implement the method of any of the first aspects described above.
In the above embodiment of the application, when the display device is started, the PWM initial value and the backlight module dimming value for backlight control stored in the power-on configuration information are obtained, and the driving current of the light bar in the backlight module is determined according to the PWM initial value and the backlight module dimming value, so as to light the light bar in the backlight module. When the initialization of the display equipment middleware is completed, a user backlight PWM value is obtained, the user backlight PWM value is the same as a PWM value corresponding to a signal source when the display equipment is shut down last time, and since the obtained PWM initial value is also the same as the PWM value corresponding to the signal source when the display equipment is shut down last time, after the user backlight PWM value is obtained, the front and back of the PWM value are not changed, so that the brightness of a light bar in a backlight module does not need to be adjusted, but the brightness of the light bar in the backlight module is kept unchanged by keeping the driving current of the light bar in the current backlight module, the backlight adjustment operation is reduced, and the backlight flicker is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic diagram illustrating an operation scenario between a display device and a control apparatus according to an embodiment;
fig. 2 is a schematic diagram illustrating a structure of a display device capable of implementing backlight control according to an embodiment;
fig. 3 is a block flow diagram illustrating backlight control according to an embodiment;
fig. 4 is a schematic diagram illustrating signaling interaction for backlight control according to an embodiment;
fig. 5 schematically shows a structure of a display device according to an embodiment.
Detailed Description
To make the objects, technical solutions and advantages of the exemplary embodiments of the present application clearer, the technical solutions in the exemplary embodiments of the present application will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present application, and it is obvious that the described exemplary embodiments are only a part of the embodiments of the present application, but not all the embodiments.
All other embodiments, which can be derived by a person skilled in the art from the exemplary embodiments shown in the present application without inventive effort, shall fall within the scope of protection of the present application. Moreover, while the disclosure herein has been presented in terms of exemplary one or more examples, it is to be understood that each aspect of the disclosure can be utilized independently and separately from other aspects of the disclosure to provide a complete disclosure.
It should be understood that the terms "first," "second," "third," and the like in the description and in the claims of the present application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used are interchangeable under appropriate circumstances and can be implemented in sequences other than those illustrated or otherwise described herein with respect to the embodiments of the application, for example.
Furthermore, the terms "comprises" and "comprising," as well as any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or device that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or device.
The term "module" as used herein refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and/or software code that is capable of performing the functionality associated with that element.
The term "remote control" as used in this application refers to a component of an electronic device, such as the display device disclosed in this application, that is typically wirelessly controllable over a short range of distances. Typically using infrared and/or Radio Frequency (RF) signals and/or bluetooth to connect with the electronic device, and may also include WiFi, wireless USB, bluetooth, motion sensor, etc. For example: the hand-held touch remote controller replaces most of the physical built-in hard keys in the common remote control device with the user interface in the touch screen.
Fig. 1 is a schematic diagram illustrating an operation scenario between a display device and a control apparatus according to an embodiment. As shown in fig. 1, a user may operate the display device 200 through the mobile terminal 300 and the control apparatus 100.
The control device 100 may control the display device 200 in a wireless or other wired manner by using a remote controller, including infrared protocol communication, bluetooth protocol communication, other short-distance communication manners, and the like. The user may input a user command through a key on a remote controller, voice input, control panel input, etc. to control the display apparatus 200. Such as: the user can input a corresponding control command through a volume up/down key, a channel control key, up/down/left/right moving keys, a voice input key, a menu key, a power on/off key, etc. on the remote controller, to implement the function of controlling the display device 200.
In some embodiments, mobile terminals, tablets, computers, laptops, and other smart devices may also be used to control the display device 200. For example, the display device 200 is controlled using an application program running on the smart device. The application, through configuration, may provide the user with various controls in an intuitive User Interface (UI) on a screen associated with the smart device.
For example, the mobile terminal 300 may install a software application with the display device 200, implement connection communication through a network communication protocol, and implement the purpose of one-to-one control operation and data communication. Such as: the function of controlling the display device 200 can be realized by establishing a control instruction protocol between the mobile terminal 300 and the display device 200 to synchronize the remote control keyboard to the mobile terminal 300 and controlling the user interface on the mobile terminal 300. The audio and video content displayed on the mobile terminal 300 can also be transmitted to the display device 200, so as to realize the synchronous display function.
As also shown in fig. 1, the display apparatus 200 also performs data communication with the server 400 through various communication means. The display device 200 may be allowed to be communicatively connected through a Local Area Network (LAN), a Wireless Local Area Network (WLAN), and other networks. The server 400 may provide various contents and interactions to the display apparatus 200. Illustratively, the display device 200 receives software program updates, or accesses a remotely stored digital media library, by sending and receiving information, as well as Electronic Program Guide (EPG) interactions. The servers 400 may be a group or groups of servers, and may be one or more types of servers. Other web service contents such as video on demand and advertisement services are provided through the server 400.
The display device 200 may be a liquid crystal display, an OLED display, a projection display device. The particular display device type, size, resolution, etc. are not limiting, and those skilled in the art will appreciate that the display device 200 may be modified in performance and configuration as desired.
The display apparatus 200 may additionally provide an intelligent network tv function that provides a computer support function in addition to the broadcast receiving tv function. Examples include a web tv, a smart tv, an Internet Protocol Tv (IPTV), and the like.
The operating system installed in the display device 200 may be an Android (Android) system, a Windows (Windows) system, or a device provider self-built system. The present application is not particularly limited as to the type of operating system that the display device 200 is equipped with.
Based on the above system architecture, in the embodiment of the present application, during the power-on process of the display device 200, the backlight flicker can be reduced, so as to improve the user experience. Further, the user may perform a human-computer interaction with the display apparatus 200 through the remote controller 100 to perform an operation of adjusting the backlight brightness of the display screen of the display apparatus 200.
The display device 200 is configured with a backlight module that provides backlight illumination for the display device 200. The backlight module comprises one or more lamp bars, and if the backlight module comprises a plurality of lamp bars, the lamp bars can be distributed at the edge or around the display screen, so that the display screen is divided into a plurality of partitions, and the partition adjustment of the backlight of the display screen can be realized by adjusting the luminous brightness of the lamp bars in the corresponding partitions.
Fig. 2 schematically shows a structural diagram of a backlight control system in the embodiment of the present application.
As shown, the backlight control mainly includes the following components: a System-on-a-Chip (SoC) main Chip 201, an RT _ PM module 202, a backlight driving module 203, and a backlight module 204.
The SoC main chip 201 is responsible for sending a dimming value (luminance data) and a PWM value to the backlight module. The PWM values are also referred to as PWM duty cycle data.
The RT _ PM module 202 is also called a backlight control module or a backlight controller, and is configured to implement a backlight control algorithm and interact with the backlight driving module 203, and is configured to determine a brightness value of a light bar in the backlight module according to a PWM value and a backlight module dimming value (luminance data), and output the brightness value to the backlight driving module 203.
The backlight driving module 203 sends a driving current of a corresponding magnitude to the light bars in the backlight module 204 according to the light bar brightness value output by the RT _ PM module 202, so as to control the brightness of the light bars.
The backlight driving module 203 may be an independent backlight driving chip.
The backlight control system can be applied to display equipment for integrally controlling backlight (the backlight module comprises one light bar), and can also be applied to display equipment for independently controlling backlight partitions (the backlight module comprises a plurality of light bars).
The display device adopting the partition independent control is mainly characterized in that a screen of the display device is divided into a plurality of independent partitions, and the brightness change of each partition can be adjusted through an independent backlight control chip. The SoC main chip can transmit the brightness of each light bar to the backlight driving module through the RT _ PM module, and the backlight driving module adjusts the current of the light bar according to the brightness value after receiving the brightness value of each light bar so as to realize the backlight brightness change of the partition corresponding to the light bar.
The brightness of the light bar is influenced by two data, namely a backlight PWM value which is mainly used for facilitating a user to adjust the brightness of a screen according to the self requirement; the second is that the SoC main chip calculates dimming values (also called light bar brightness values) of each partition according to the image.
The embodiment of the application optimizes the starting process of the display equipment so as to reduce the backlight flicker phenomenon.
Fig. 3 is a block flow diagram illustrating a backlight control provided by an embodiment of the present application. As shown, the process may include:
s301: the display equipment is started, firstly, a bootstrap program is started, and after the bootstrap program is started, the backlight controller acquires a PWM initial value used for backlight control and an initial value of a backlight module dimming value, wherein the PWM initial value is stored in the startup configuration information.
And the PWM initial value in the startup configuration information is written by the middleware according to the PWM value corresponding to the signal source when the display equipment is shut down last time.
In this step, when the display device is started, the boot program is started and the RT _ PM module (backlight controller) is started. After the boot program is started, reading the PWM initialization value from the boot configuration information, and writing the PWM initialization value into the shared memory, so that the RT _ PM module (backlight controller) reads the PWM initialization value from the shared memory. After the RT _ PM module (backlight controller) is started, a dimming value (luminance data) of the backlight module is initialized to obtain an initial value of the dimming value of the backlight module.
Alternatively, for a display device employing partition independent control, the RT _ PM module (backlight controller) may initialize the dimming value (luminance data) of each partition to the maximum value 255. The larger the dimming value (luminance data) of each division area is, the higher the backlight luminance of each division area is.
S302: and the backlight controller determines the brightness value of the light bar in the backlight module according to the PWM initial value and the initial value of the dimming value of the backlight module, so that the light bar in the backlight module adjusts the brightness according to the brightness value.
In this step, the boot program has stored the PWM initial value into the shared memory, and the RT _ PM module (backlight controller) reads the PWM initial value from the shared memory (however, since the initialization of the middleware of the display device takes a long time and the middleware has not written the user backlight PWM value into the shared memory, the PWM value read out from the shared memory by the RT _ PM module is the initial PWM value written into the shared memory by the boot program), so that the luminance value of the light bar in the backlight module can be determined according to the initial value of the dimming value (localdiming data) of the backlight module and the PWM initial value, and is transmitted to the backlight driving module. The backlight driving module can calculate the magnitude of each light bar according to the driving current according to the brightness value of the light bar corresponding to each partition, so that the brightness of each light bar is controlled through the driving current of each light bar.
The middleware is a kind of software between the application system and the system software, and it uses the basic service (function) provided by the system software to connect each part of the application system or different applications on the network, so as to achieve the purpose of resource sharing and function sharing. Middleware is a separate system software service by which distributed application software shares resources between different technologies, resides on the operating system of the client server, manages computing resources and network communications.
S303: the backlight controller obtains a user backlight PWM value after the display device middleware is initialized.
And the user backlight PWM value is the same as the PWM value corresponding to the signal source when the display equipment is shut down last time.
In this step, when the display device is started, the display device middleware is started. And initializing the display equipment middleware after the display equipment middleware is started, and writing the user backlight PWM value into the shared memory. The RT _ PM module (backlight controller) reads the user backlight PWM value from the shared memory.
Because the initialization process of the middleware is long, before the middleware obtains a user backlight PWM value and writes the user backlight PWM value into the shared memory, the RT _ PM module (backlight controller) already obtains a dimming value (Iocaldimming data) and a PWM initial value of the backlight module, and determines the brightness value of the lamp strip in the backlight module according to the dimming value (Localdimming data) and the PWM initial value of the backlight module, so that the backlight driving module can determine that the lamp strip in the backlight module emits light.
S304: because the PWM initial value is the same as the user backlight PWM value, the backlight controller keeps the driving current of the light bar in the current backlight module unchanged.
In this step, the user backlight PWM value read from the shared memory by the RT _ PM module (backlight controller) is the same as the previously read PWM initial value, and is equal to the PWM value corresponding to the signal source when the display device was last powered off, so that the brightness of the light bar in the backlight module does not need to be adjusted at this time, but the driving current of the light bar in the current backlight module is kept unchanged, and the brightness value of the light bar in the single-track backup module is kept unchanged.
Optionally, in this embodiment of the application, when the display device is turned off, the middleware may store the user backlight PWM value corresponding to the current signal source of the display device in the power-on configuration information, so as to be used as the initial PWM value when the display device is turned on next time. And if the signal source switching is carried out for multiple times when the display equipment is shut down, the PWM value finally written into the startup configuration information is the user backlight PWM value corresponding to the signal source to be switched to finally.
Optionally, in some embodiments, a step value (or a step value) of the dimming value of the backlight module may be preset. When the initialization of the kernel is completed and the backlight module dimming value (localdiming data) set by the initialization is sent to the RT _ PM module (backlight controller), the RT _ PM module (backlight controller) can gradually update the backlight module dimming value (localdiming data) according to the step value and determine the brightness value of the light bar in the backlight module according to the updated backlight module dimming value (localdiming data), so that the light bar in the backlight module adjusts the brightness according to the brightness value until the updated backlight module dimming value (localdiming data) is equal to the backlight module dimming value (localdiming data) set by the initialization of the kernel. By setting the step value of the subarea dimming value, the intensity of the subarea dimming value can be adjusted from the lowest intensity step of the backlight module dimming value until the intensity is the same as that of the backlight module dimming value set by the kernel. According to the starting time and the partition dimming intensity, the experience of backlight flickering for a user can be improved in the starting stage, and the user experience is improved.
Taking an intelligent electronic appliance adopting partition independent control as an example, fig. 4 exemplarily shows a signaling interaction diagram of a backlight control flow. As shown in the figure, when the smart television is powered on, the boot program, the PR _ PM module, the kernel, and the television middleware in the smart television are respectively started and initialized, and the process may include:
at 401-402: after the boot program (boot) is started, the PWM duty cycle value (pwmduty) is read from the environment variable and the parameter value is written to the shared memory.
The PWM duty value (PWM) read from the environment variable is a user backlight PWM value corresponding to the cell source when the television is turned off, and is added to the environment variable by the television middleware when the television is turned off.
At 403-405: after the RT _ PM module is started, the respective zone dimming values (iocaldiming data) in the module are initialized to 255, and the PWM duty cycle values (pwmduty) are read from the shared memory.
Wherein, at 403, the RT _ PM module may further obtain a step value of the preset zone dimming value for subsequent use.
At 406: the RT _ PM module determines the brightness value of the light bar corresponding to each partition according to the dimming value (luminance data) of each partition and the read PWM duty ratio value (PWM duty), and transmits the brightness value to the backlight driving module, so that the backlight driving module lights each light bar according to the brightness value of the light bar corresponding to each partition. At the moment, the backlight is pulled up, and the smart television is bright.
At 407-408: after the kernel is started, the LD module is initialized to set dimming values (logging data) of each partition according to a boot screen, and the dimming values (logging data) of each partition are sent to the RT _ PM module. The RT _ PM module updates the brightness value of each light bar in the backlight module according to the partition dimming value set by the kernel and the previously acquired PWM initialization value, and transmits the brightness value to the backlight driving module, so that the backlight driving module can update the brightness value of each light bar corresponding to each partition according to the brightness value of each light bar corresponding to each partition.
At 408, the RT _ PM module may gradually adjust the divisional dimming value according to the step value obtained at 403 until reaching the divisional dimming value set by the kernel, and after each adjustment according to the step value is completed, determine the brightness value of each light bar in the backlight module according to the adjusted divisional dimming value and the current PWM value, and transmit the brightness value to the backlight driving module, so that the backlight driving module adjusts the brightness of each light bar in the backlight module.
At 409-411: and initializing after the television middleware is started, initializing the backlight, setting the PWM as a user backlight PWM value corresponding to the signal source when the television is shut down last time, and writing the user backlight PWM value into the shared memory.
And the PWM value obtained by initializing the television middleware is the user backlight PWM value corresponding to the signal source kept when the television is turned off.
At 412-414: the RT _ PM module reads the PWM value from the shared memory, and at this time, the PWM value written by the middleware at 411 is read, and since the currently read PWM value is the same as the PWM initial value read at 405 and the partition dimming value is not changed, the brightness value of each light bar in the current backlight module is maintained.
According to the process shown in fig. 4, for a television which does not adopt independent control of backlight partitions, in a boot stage, when initializing a PWM backlight control channel, a PWM initialization value (which is equal to a backlight PWM value when the television is turned off) in an environment variable is obtained, and the PWM initialization value output according to the parameter setting is consistent with the PWM parameter value in the environment variable.
According to the process shown in fig. 4, for the television adopting the backlight partition independent control, in the boot stage, the pwmduty value in the environment variable is written into the shared memory; the method comprises the steps that when the RT _ PM module is started and initialized, the PWM value is obtained from the shared memory for initialization, and as the initialization of the middleware is completed, the PWM value set when the backlight setting is effective by a user is the same as the PWM value of the backlight initialization, the backlight flicker caused by the change of the PWM value in the starting process is eliminated.
As can be seen from the above description, in the embodiment of the present application, after the display device is started, when the PWM is initialized in the boot (boot) phase, the initial value of the PWM is maintained to be the same as the user backlight PWM value of the middleware after the display device is started, so that the PWM value does not change after the middleware is started, thereby eliminating screen flicker caused by the change of the PWM value. And writing the PWM initial value into a shared memory in a Boot (Boot) stage, and acquiring the PWM initial value from the shared memory by the RT _ PM module for initialization. After a kernel (kernel) is started, the SoC Iocaldim module is initialized successfully, and at the moment, the backlight value of each partition is normally sent to the kernel for optimization according to the image brightness, so that screen image flicker caused by backlight change of each partition after the Iocaldim is initialized is eliminated.
Optionally, in some embodiments, multiple channels may be supported to the display device, and different channels may be associated with different image modes. The display device may record corresponding user backlight PWM values for image patterns associated with different channels. For example, if the current channel of the display device is channel 1, when the display device is turned off, the middleware saves the user backlight PWM value of the image mode associated with the current channel 1; for another example, if the current channel of the display device is channel 2, when the display device is turned off, the middleware records the current channel 2 and therefore the user backlight PWM of the associated image mode. The recorded user backlight PWM value may be added to the environment variable so as to be retrieved by the boot program when the display device is restarted, and written as the PWM initial value into the shared memory.
Wherein the channels may also be referred to as signal sources, for example, a display device may support the following channels:
HDMI (High Definition Multimedia Interface) channel, which is a full digital video and audio transmission Interface and can transmit uncompressed audio and video signals. The current image mode is 'natural', and the backlight setting custom value is 20, then the corresponding user backlight PWM value is 200 (the value range of the PWM value is 0-255);
if the current image mode of the DTV (digital television) channel is 'vivid' and the backlight setting custom value is 15, the corresponding user backlight PWM value is 100 (the value range of the PWM value is 0-255).
The television can set a default power-on channel in the setting, such as setting a last signal source, or HDMI. For example, if the default power-on channel selected by the user is DTV, when the display device is turned off, the PWM value corresponding to the backlight under DTV may be set to the environment variable, that is, set PWM to 100 to the environment variable: pwmdity is 100.
Based on the same technical concept, embodiments of the present application further provide a display device, where the display device may implement the flow performed in fig. 3 or fig. 4 in the foregoing embodiments.
Fig. 5 illustrates a schematic structural diagram of a display device 500 provided in an embodiment of the present application, and referring to fig. 5, the display device 500 includes a processor 501, a memory 502, and a display 503. The processor 501 may also be a controller. The processor 501 is configured to support the terminal to perform the functions involved in the aforementioned procedures. The memory 502 is used for coupling with the processor 501, and it holds the necessary program instructions and data for the terminal. The processor 501 is connected to the memory 502 and the display, the memory 502 is used for storing instructions, and the processor 501 is used for executing the instructions stored in the memory 502 to complete the steps of the method in which the client device executes corresponding functions. The display 503 may display according to the control of the processor 501.
For the concepts, explanations, detailed descriptions and other steps related to the technical solutions provided in the embodiments of the present application and related to the display device 500 in the embodiments of the present application, please refer to the descriptions of the foregoing methods or other embodiments, which are not described herein again.
It should be noted that the processor referred to in the embodiments of the present application may be a Central Processing Unit (CPU), a general purpose processor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic devices, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a DSP and a microprocessor, or the like. Wherein the memory may be integrated in the processor or may be provided separately from the processor.
Based on the same technical concept, the embodiment of the application also provides a computer readable storage medium. The computer-readable storage medium stores computer-executable instructions for causing a computer to perform the processes performed in fig. 3 or fig. 4.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of 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.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
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 method, comprising:
starting a bootstrap program and a backlight controller;
the starting bootstrap program reads a Pulse Width Modulation (PWM) initialization value in the starting configuration information and writes the PWM initialization value into the shared memory so that the backlight controller acquires the PWM initialization value stored in the shared memory; the method comprises the steps that a PWM initialization value is written into power-on configuration information by a middleware of the display equipment according to a PWM value corresponding to a signal source when the television is turned off when the display equipment is turned off last time, wherein the signal source is a default power-on signal source;
the backlight controller acquires a dimming value of a backlight module and acquires a PWM (pulse width modulation) initialization value from the shared memory, and determines a brightness value of a light bar in the backlight module according to the PWM initialization value and the dimming value of the backlight module, so that the light bar in the backlight module adjusts the brightness according to the brightness value;
after the boot program is started, starting a middleware, writing a user backlight PWM value into the shared memory after the middleware is initialized, wherein the user backlight PWM value is equal to a PWM value corresponding to a signal source when the prime number display equipment is shut down last time;
and the backlight controller acquires the user backlight PWM value in the shared memory, responds to the user backlight PWM value being the same as the PWM initialization value, keeps the brightness value of the light bar in the backlight module unchanged, and takes the current signal source as a default starting signal source.
2. The method of claim 1, further comprising:
and responding to the shutdown of the display equipment, and storing the PWM value corresponding to the current signal source when the display equipment is shut down into the startup configuration information.
3. The method of claim 1, further comprising:
after the kernel is initialized, the backlight controller obtains a backlight module dimming value initialized by the kernel, and executes at least one backlight module dimming value updating step according to a preset step value until the target backlight module dimming value is the same as the backlight module dimming value initialized by the kernel;
wherein, the backlight module dimming value updating step comprises:
and determining an updated target backlight module dimming value according to the stepping value and the backlight module dimming value before updating, and determining the brightness value of the light bar in the backlight module according to the target backlight module dimming value, so that the light bar in the backlight module adjusts the brightness according to the brightness value.
4. The method according to any of claims 1-3, wherein the backlight module dimming values comprise dimming values for respective sections of the backlight module;
the determining the brightness value of the light bar in the backlight module according to the PWM initial value and the dimming value of the backlight module comprises:
and determining the brightness value of each light bar in the backlight module according to the PWM initial value and the dimming value of each partition of the backlight module.
5. A display device, comprising:
starting a bootstrap program and a backlight controller;
the starting bootstrap program reads a Pulse Width Modulation (PWM) initialization value in the starting configuration information and writes the PWM initialization value into the shared memory so that the backlight controller acquires the PWM initialization value stored in the shared memory; the method comprises the steps that a signal source is used as a default starting signal source, wherein the PWM initialization value is written into starting configuration information by a middleware of the display equipment according to a PWM value corresponding to the signal source when the television is turned off when the display equipment is turned off last time;
the backlight controller is used for acquiring the PWM initialization value stored in the shared memory and acquiring a backlight module dimming value, determining the brightness value of a light bar in the backlight module according to the PWM initialization value and the backlight module dimming value, and outputting the brightness value to the driving module;
the middleware is started after the boot program is started, and is used for writing a user backlight PWM value into the shared memory after initialization, wherein the user backlight PWM value is equal to a PWM value corresponding to a signal source when the display equipment is shut down last time;
the driving module is used for outputting driving current to the lamp strip in the backlight module according to the brightness value so as to adjust the brightness of the lamp strip;
the backlight controller is further configured to obtain the user backlight PWM value in the shared memory after the middleware is started, determine that the PWM initialization value is the same as the user backlight PWM value, and keep the brightness value of the light bar in the backlight module unchanged, where the current signal source is a default starting signal source.
6. The display device of claim 5, wherein the middleware is to:
and responding to the shutdown of the display equipment, and storing the PWM value corresponding to the current signal source when the display equipment is shut down into the startup configuration information.
7. The display device of claim 5, wherein the backlight controller is further to:
after the kernel is initialized, acquiring a backlight module dimming value initialized by the kernel, and executing at least one backlight module dimming value updating step according to a preset step value until the target backlight module dimming value is the same as the backlight module dimming value initialized by the kernel;
wherein, the backlight module dimming value updating step comprises:
and determining an updated target backlight module dimming value according to the stepping value and the backlight module dimming value before updating, and determining the brightness value of the light bar in the backlight module according to the target backlight module dimming value, so that the light bar in the backlight module adjusts the brightness according to the brightness value.
8. The display device according to any of claims 5-7, wherein the backlight module dimming values comprise dimming values for respective segments of the backlight module;
the backlight controller is specifically configured to:
and determining the brightness value of each light bar in the backlight module according to the PWM initial value and the dimming value of each partition of the backlight module.
9. A display device, comprising: a processor, a memory;
the memory to store computer instructions;
the processor coupled with the memory, the processor configured to execute the computer instructions to implement the method of any of claims 1-4.
10. A computer-readable storage medium, characterized in that the storage medium stores computer instructions which, when executed by a processor, implement the method of any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010058006.XA CN111243532B (en) | 2020-01-16 | 2020-01-16 | Backlight control method and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010058006.XA CN111243532B (en) | 2020-01-16 | 2020-01-16 | Backlight control method and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111243532A CN111243532A (en) | 2020-06-05 |
| CN111243532B true CN111243532B (en) | 2022-03-22 |
Family
ID=70864923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010058006.XA Active CN111243532B (en) | 2020-01-16 | 2020-01-16 | Backlight control method and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111243532B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114464148A (en) * | 2021-12-28 | 2022-05-10 | 深圳市鸿合创新信息技术有限责任公司 | Electronic equipment and method and device for controlling power-on/power-off time sequence thereof |
| CN114387928B (en) * | 2021-12-29 | 2023-08-08 | 龙芯中科技术股份有限公司 | Backlight switching method and device, electronic equipment and storage medium |
| CN114648964B (en) * | 2022-03-28 | 2023-10-17 | Tcl华星光电技术有限公司 | Driving integrated circuit, backlight module and display device |
| CN114827510A (en) * | 2022-04-25 | 2022-07-29 | 深圳创维－Rgb电子有限公司 | Method, device and equipment for backlight of picture matrix and computer storage medium |
| CN115394260B (en) * | 2022-08-23 | 2023-07-25 | 昆山龙腾光电股份有限公司 | Liquid crystal display method, device, computer equipment and storage medium |
| CN115881046A (en) * | 2022-12-26 | 2023-03-31 | 深圳市巨烽显示科技有限公司 | Display backlight stabilizing method, device, equipment and storage medium |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101038715A (en) * | 2007-04-26 | 2007-09-19 | 海尔集团公司 | Process for startup and closing backlight lamp of liquid crystal screen and control system thereof |
| CN101956962A (en) * | 2009-07-15 | 2011-01-26 | 联咏科技股份有限公司 | Light-emitting diode device and method for avoiding soft boot flash |
| CN205160658U (en) * | 2015-11-18 | 2016-04-13 | 创维电子器件（宜春）有限公司 | Constant current drive controlling means and laser television |
| CN105679256A (en) * | 2015-05-25 | 2016-06-15 | 深圳Tcl数字技术有限公司 | Method and device for dynamically adjusting backlight |
| CN106101834A (en) * | 2016-06-20 | 2016-11-09 | 深圳Tcl数字技术有限公司 | Intelligent television and control method thereof |
| CN107180615A (en) * | 2017-07-06 | 2017-09-19 | 青岛海信电器股份有限公司 | Method for controlling backlight thereof and device when electronic equipment is spread its tail |
| US9959995B2 (en) * | 2014-08-01 | 2018-05-01 | Dell Products, Lp | Keyboard backlight system |
| CN109064999A (en) * | 2018-07-20 | 2018-12-21 | 珠海诚锋电器有限公司 | A kind of picture image parameter regulation means and its device based on screen back light value |
| CN110277069A (en) * | 2019-06-27 | 2019-09-24 | 青岛海信电器股份有限公司 | A kind of video screen method for controlling backlight thereof, device and TV |
| CN110288952A (en) * | 2019-06-24 | 2019-09-27 | 湖北亿咖通科技有限公司 | The setting method and device of backlight illumination when a kind of onboard system is switched on |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101392925B1 (en) * | 2007-10-23 | 2014-05-09 | 엘지전자 주식회사 | Mobile terminal and backlight luminance control apparatus |
| CN101441860B (en) * | 2008-12-22 | 2010-11-10 | 三一重工股份有限公司 | Control device for starting LCD power supply |
| CN102447858A (en) * | 2011-12-28 | 2012-05-09 | 彩虹集团公司 | LED (Light Emitting Diode) backlight control method based on infrared eye-tracking technology |
| TWI464339B (en) * | 2012-03-03 | 2014-12-11 | Lextar Electronics Corp | Light emitting diode bar and light emitting diode module using the same |
| CN102665325B (en) * | 2012-04-12 | 2015-03-11 | 深圳市华星光电技术有限公司 | LED backlight drive circuit, backlight module and liquid crystal display device |
| CN102866901A (en) * | 2012-08-14 | 2013-01-09 | 惠州Tcl移动通信有限公司 | Wireless communication equipment startup image updating method and system, and wireless communication equipment |
| TWI498874B (en) * | 2013-10-08 | 2015-09-01 | Wistron Corp | Display electronic device and backlight adjustment method thereof |
| WO2016204973A1 (en) * | 2015-06-19 | 2016-12-22 | Intel Corporation | Enabling a chipset that supports a single display to support dual display |
| CN208623327U (en) * | 2018-07-25 | 2019-03-19 | 广州视源电子科技股份有限公司 | Discharge circuit |
| CN109616057B (en) * | 2018-12-12 | 2020-09-25 | 海信视像科技股份有限公司 | Backlight brightness control method and device and smart television |
| CN109473067A (en) * | 2018-12-13 | 2019-03-15 | 青岛海信电器股份有限公司 | A kind of back light brightness regulating method, device and display equipment |
-
2020
- 2020-01-16 CN CN202010058006.XA patent/CN111243532B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101038715A (en) * | 2007-04-26 | 2007-09-19 | 海尔集团公司 | Process for startup and closing backlight lamp of liquid crystal screen and control system thereof |
| CN101956962A (en) * | 2009-07-15 | 2011-01-26 | 联咏科技股份有限公司 | Light-emitting diode device and method for avoiding soft boot flash |
| US9959995B2 (en) * | 2014-08-01 | 2018-05-01 | Dell Products, Lp | Keyboard backlight system |
| CN105679256A (en) * | 2015-05-25 | 2016-06-15 | 深圳Tcl数字技术有限公司 | Method and device for dynamically adjusting backlight |
| CN205160658U (en) * | 2015-11-18 | 2016-04-13 | 创维电子器件（宜春）有限公司 | Constant current drive controlling means and laser television |
| CN106101834A (en) * | 2016-06-20 | 2016-11-09 | 深圳Tcl数字技术有限公司 | Intelligent television and control method thereof |
| CN107180615A (en) * | 2017-07-06 | 2017-09-19 | 青岛海信电器股份有限公司 | Method for controlling backlight thereof and device when electronic equipment is spread its tail |
| CN109064999A (en) * | 2018-07-20 | 2018-12-21 | 珠海诚锋电器有限公司 | A kind of picture image parameter regulation means and its device based on screen back light value |
| CN110288952A (en) * | 2019-06-24 | 2019-09-27 | 湖北亿咖通科技有限公司 | The setting method and device of backlight illumination when a kind of onboard system is switched on |
| CN110277069A (en) * | 2019-06-27 | 2019-09-24 | 青岛海信电器股份有限公司 | A kind of video screen method for controlling backlight thereof, device and TV |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111243532A (en) | 2020-06-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111243532B (en) | Backlight control method and display device | |
| WO2017193612A1 (en) | Apparatus employing mobile terminal to operate electronic apparatus, system, and method | |
| CN111899680B (en) | Display device and setting method thereof | |
| CN105632414B (en) | Method for controlling backlight thereof, device and equipment in a kind of terminal device start process | |
| WO2020119240A1 (en) | Backlight brightness adjustment method and liquid crystal display device | |
| US20050273663A1 (en) | Computer system, method, and medium for switching operating system | |
| CN109346014B (en) | Virtual reality equipment and screen control method thereof | |
| CN110390911B (en) | Display screen backlight brightness control method of electronic equipment and electronic equipment | |
| CN110032265B (en) | Control method of image display device, image display system and image display device | |
| CN113271422A (en) | Brightness adjusting method and device, television and computer readable storage medium | |
| CN110602540B (en) | Volume control method of display equipment and display equipment | |
| US12114104B2 (en) | Control device, and control method | |
| CN103188559A (en) | Upgrading apparatus, display apparatus, control method thereof and display system | |
| US20180225034A1 (en) | System and Method For Generating a User Interface For Communicating With a Remote Device | |
| CN112449247B (en) | Data refreshing method and display device | |
| US11265593B2 (en) | Display device, hardware dongle capable of coupling to the display device, and method for controlling the display device | |
| CN110796222A (en) | Electronic tag, short-distance wireless communication equipment and working method | |
| CN112165560B (en) | Image signal processing method, system, computer equipment and storage medium | |
| CN111818695B (en) | Control system, method and display module | |
| US10171876B2 (en) | Media switch device, media switch system and media switch method | |
| CN116301694A (en) | Control method and device | |
| WO2024187846A1 (en) | Display screen control method and electronic device | |
| CN114694599B (en) | Display device and mura processing method | |
| CN113012650B (en) | Backlight driving method and device and display equipment | |
| CN111462702B (en) | Display device backlight control method and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |