CN114267303A - Method, device and equipment for adjusting brightness - Google Patents
Method, device and equipment for adjusting brightness Download PDFInfo
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- CN114267303A CN114267303A CN202111657338.0A CN202111657338A CN114267303A CN 114267303 A CN114267303 A CN 114267303A CN 202111657338 A CN202111657338 A CN 202111657338A CN 114267303 A CN114267303 A CN 114267303A
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Abstract
The application provides a method, a device and equipment for adjusting brightness, which adjust the brightness of a backlight unit to intermediate brightness through a pulse amplitude modulation and/or pulse width modulation mode, and then adjust the brightness of the backlight unit from the intermediate brightness to reference brightness through the pulse amplitude modulation and/or pulse width modulation mode, so that a liquid crystal display device can quickly reach brightness close to target brightness before displaying the target brightness, and the response time of the liquid crystal display device is shortened. Therefore, the existing driving technology can be replaced, the response time of the liquid crystal display device is prolonged, the inverse ghost problem caused by over-driving is avoided, the complex problem of a hardware structure caused by solving the inverse ghost is further avoided, the hardware structure and size are simplified, and the cost is reduced.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a method, an apparatus, and a device for adjusting brightness.
Background
The liquid crystal display device requires a certain time from the emission of the driving signal to the response, i.e., the change in pixel luminance lags behind the change in the driving signal, and the original picture is maintained until the next picture appears, thereby aggravating the effect of visual persistence of human eyes, resulting in image smear, ghost, or the like.
At present, the response speed of the liquid crystal display screen is improved by using an over driving technology (over driving) or a under driving technology (under driving) so as to solve the problem of image trailing or image sticking. But excessive driving (driving) causes the liquid crystal display panel to produce an inverse afterimage.
At present, in order to solve the image sticking and the inverse image sticking, a frame buffer (frame buffer) compression technique or a line buffer (line buffer) compression technique is used, which results in a complicated hardware structure and a large size, and increases the cost.
Disclosure of Invention
The application provides a method, a device and equipment for adjusting brightness, which are used for simplifying the hardware structure and size and reducing the cost.
In a first aspect, the present application provides a method for adjusting brightness, comprising:
adjusting the brightness of the backlight unit from the current brightness to the intermediate brightness through a modulation mode, wherein the modulation mode comprises pulse amplitude modulation and/or pulse width modulation;
adjusting the brightness of the backlight unit from the intermediate brightness to the reference brightness through the modulation mode so as to enable the liquid crystal display device to display the target brightness;
and the absolute value of the difference value between the intermediate brightness and the reference brightness is greater than a preset value.
Optionally, the method further includes: the rotation speed of liquid crystal molecules in the liquid crystal display device is adjusted by a driving technique.
Optionally, the backlight unit includes a light emitting diode;
the adjusting the brightness of the backlight unit from the current brightness to the intermediate brightness by the modulation method specifically includes:
and adjusting the light emitting intensity of the light emitting diodes in a modulation mode to adjust the brightness of the backlight unit from the current brightness to the intermediate brightness.
Optionally, the intermediate brightness is greater than the reference brightness;
the adjusting the brightness of the backlight unit from the current brightness to the intermediate brightness by the modulation method specifically includes:
increasing the brightness of a backlight unit through a modulation mode so as to enable the brightness of the backlight unit to be from the current brightness to the intermediate brightness;
correspondingly, the adjusting the brightness of the backlight unit from the intermediate brightness to the reference brightness by the modulation method to enable the liquid crystal display device to display the target brightness specifically includes:
and reducing the brightness of the backlight unit by the modulation mode so that the brightness of the backlight unit is from the intermediate brightness to the reference brightness, so that the liquid crystal display device displays the target brightness.
Optionally, the intermediate brightness is smaller than the reference brightness;
the adjusting the brightness of the backlight unit from the current brightness to the intermediate brightness by the modulation method specifically includes:
reducing the brightness of a backlight unit through a modulation mode so as to enable the brightness of the backlight unit to be from the current brightness to the intermediate brightness;
correspondingly, the adjusting the brightness of the backlight unit from the intermediate brightness to the reference brightness by the modulation method to enable the liquid crystal display device to display the target brightness specifically includes:
and increasing the brightness of the backlight unit from the intermediate brightness to the reference brightness through the modulation mode so that the liquid crystal display device displays the target brightness.
Optionally, the current frame of the liquid crystal display device includes a plurality of sequentially ordered subframes;
the increasing the brightness of the backlight unit by the modulation method to make the brightness of the backlight unit from the current brightness to the intermediate brightness specifically includes:
increasing the brightness of a backlight unit through a modulation mode so that the brightness of the backlight unit is from the current brightness to the intermediate brightness, and the brightness of a first subframe displayed by the liquid crystal display device is from the reference brightness;
the reducing the brightness of the backlight unit from the intermediate brightness to the reference brightness by the modulation method to enable the liquid crystal display device to display the target brightness specifically includes:
and gradually reducing the brightness of the backlight unit through the modulation mode so as to gradually reduce the brightness of the backlight unit from the middle brightness to the reference brightness, so that the brightness of the second sub-frame to the last sub-frame displayed by the liquid crystal display device mainly approaches to the target brightness until the target frame of the liquid crystal display device displays the target brightness.
Optionally, the current frame of the liquid crystal display device includes a plurality of sequentially ordered subframes;
reducing the brightness of the backlight unit through a modulation mode so as to enable the brightness of the backlight unit to be from the current brightness to the intermediate brightness, specifically comprising:
reducing the brightness of the backlight unit through a modulation mode so that the brightness of the backlight unit is from the current brightness to the intermediate brightness, and the brightness of the first subframe displayed by the liquid crystal display device is from the reference brightness;
the increasing the brightness of the backlight unit by a modulation method to enable the liquid crystal display device to display the target brightness specifically includes:
and gradually increasing the brightness of the backlight unit through the modulation mode so as to gradually increase the brightness of the backlight unit from the middle brightness to the reference brightness, so that the brightness of the second sub-frame to the last sub-frame displayed by the liquid crystal display device gradually approaches the target brightness until the target frame of the liquid crystal display device displays the target brightness.
Optionally, the adjusting the rotation speed of the liquid crystal molecules in the liquid crystal display device by using the driving technique specifically includes:
the rotation speed of liquid crystal molecules in the liquid crystal display device is increased by applying a voltage to the liquid crystal display device.
In a second aspect, the present application provides an apparatus for adjusting brightness, comprising:
the first adjusting module is used for adjusting the brightness of the backlight unit from the current brightness to the intermediate brightness through a modulation mode, wherein the modulation mode comprises pulse amplitude modulation and/or pulse width modulation;
the second adjusting module is used for adjusting the brightness of the backlight unit from the intermediate brightness to the reference brightness through the modulation mode so as to enable the liquid crystal display device to display the target brightness;
and the absolute value of the difference value between the intermediate brightness and the reference brightness is greater than a preset value.
In a third aspect, the present application provides a display apparatus, comprising the brightness adjusting device of the second aspect, a backlight unit and a liquid crystal display device, wherein the backlight unit is connected with the brightness adjusting device and the liquid crystal display device;
the device for adjusting the brightness is used for adjusting the brightness of the backlight unit so as to adjust the brightness of the liquid crystal display device.
In a fourth aspect, the present application provides an electronic device comprising: a memory and a processor;
the memory is used for storing instructions; the processor is used for calling instructions in the memory to execute the method for adjusting the brightness in the first aspect and any one of the possible designs of the first aspect.
In a fifth aspect, the present application provides a computer-readable storage medium having stored thereon computer instructions, which, when executed by at least one processor of an electronic device, cause the electronic device to perform the method for adjusting brightness in any one of the possible designs of the first aspect and the first aspect.
In a sixth aspect, the present application provides a computer program product comprising computer instructions that, when executed by at least one processor of an electronic device, cause the electronic device to perform the method of adjusting brightness in the first aspect and any one of the possible designs of the first aspect.
According to the method for adjusting the brightness, the brightness of the backlight unit is adjusted from the current brightness to the middle brightness through the pulse amplitude modulation and/or the pulse width modulation mode, then the brightness of the backlight unit is adjusted from the middle brightness to the reference brightness through the pulse amplitude modulation and/or the pulse width modulation mode, so that the liquid crystal display device displays the target brightness, the absolute value of the difference value between the middle brightness and the reference brightness is larger than the preset value, the brightness of the backlight unit is adjusted from the current brightness to the middle brightness through the pulse amplitude modulation and/or the pulse width modulation mode, the difference value between the middle brightness and the reference brightness is larger, and therefore the liquid crystal display device can quickly reach the brightness close to the target brightness before reaching the target brightness, and response time is shortened. The response time of the liquid crystal display device is shortened by the pulse amplitude modulation and/or pulse width modulation mode, excessive hardware circuit structures are not needed, and the cost is reduced. And the reverse afterimage phenomenon caused by the overdrive can not be generated.
Drawings
In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings needed for 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method for adjusting brightness according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram illustrating response time of a liquid crystal display device according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram illustrating response time of a liquid crystal display device according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an apparatus for adjusting brightness according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present application;
fig. 6 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application.
Detailed Description
To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The liquid crystal display device requires a certain time from the emission of the driving signal to the response, i.e., the change in pixel luminance lags behind the change in the driving signal, and the original picture is maintained until the next picture appears, thereby aggravating the effect of visual persistence of human eyes, resulting in image smear, ghost, or the like.
The response time is divided into a rise time and a fall time, and the time required for the pixel to transition from dark to light, i.e., the voltage transitions from a low level to a high level, is the rise time, and the time required for the pixel to transition from a light to dark voltage from a high level to a low level is the fall time. Since the brightness of the liquid crystal display device is related to the rotation angle of the liquid crystal molecules, and the brightness change of the liquid crystal display device is related to the rotation speed of the liquid crystal molecules, at present, the rotation speed of the liquid crystal molecules is increased by using an over driving technique (over driving) to increase the rising time of the liquid crystal display device, and the rotation speed of the liquid crystal molecules is increased by using an under driving technique (under driving) to increase the falling time of the liquid crystal display device, so as to solve the problem of image trailing or image sticking. The rotation angle of the liquid crystal molecules is a speed of rotating from an initial position to a certain angle, and accordingly, the rotation speed refers to a speed of rotating the liquid crystal molecules from the certain angle to the initial position. The overdrive technology is to instantly switch in a voltage slightly higher than the voltage required by the liquid crystal display screen and then reduce the voltage to a target voltage so as to improve the rotation speed of liquid crystal molecules and further improve the response speed of the liquid crystal display device, and the underdrive technology is to instantly switch in a voltage slightly lower than the voltage required by the liquid crystal display screen and then increase the voltage to a target voltage so as to improve the rotation speed of the liquid crystal molecules and further improve the response speed of the liquid crystal display device.
However, excessive driving (driving) causes the lcd device to generate reverse afterimage, which means that the pressure variation is too large, the conversion range exceeds the final required color value, and the pixels need to be adjusted to the final required color value, so that a light white or black halo is left behind the image.
In order to solve the ghost and the inverse ghost, a frame buffer (frame buffer) compression technique or a line buffer (line buffer) compression technique is used, which results in a complex hardware structure, a large size, and an increase in cost.
In addition, the applicant finds that the brightness of the liquid crystal display device is not only related to the rotation angle of the liquid crystal molecules, but also related to the brightness of a backlight unit of the liquid crystal display device, and the application provides a method for adjusting the brightness, wherein the brightness of the backlight unit is adjusted from the current brightness to the intermediate brightness through a pulse amplitude modulation and/or pulse width modulation mode, so that the brightness of the liquid crystal display device is changed from the corresponding current brightness to the corresponding intermediate brightness, and the absolute value of the difference value between the intermediate brightness and the current brightness of the backlight unit is greater than a preset value, so that the intermediate brightness and the current brightness of the liquid crystal display device are also greatly different. By adjusting the brightness of the backlight unit to the intermediate brightness, the liquid crystal display device quickly reaches a brightness approaching the target brightness before reaching the target brightness. And then, the brightness of the backlight unit is adjusted from the middle brightness to the reference brightness by a pulse amplitude modulation and/or pulse width modulation mode, so that the liquid crystal display device displays the target brightness, and the response time of the liquid crystal display device is shortened. Therefore, the brightness of the backlight unit is adjusted by the pulse amplitude modulation and/or the pulse width modulation mode to adjust the brightness of the liquid crystal display device, excessive hardware circuit structures are not needed, and the cost is reduced. And the inverse ghost phenomenon caused by over-driving can not be generated by the pulse amplitude modulation and/or the pulse width modulation mode. And the response time of the liquid crystal display device is shortened by adjusting the brightness of the backlight unit, and the trailing or afterimage phenomenon of the liquid crystal display device is reduced.
The technical solution of the present application will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a flowchart illustrating a method for adjusting brightness according to an embodiment of the present application. The method of the embodiment may include the steps of:
s101, adjusting the brightness of the backlight unit from the current brightness to the intermediate brightness through a modulation mode, wherein the modulation mode comprises pulse amplitude modulation and/or pulse width modulation.
Since the response time of the liquid crystal display device affects the display effect of the liquid crystal display device, the longer the response time, the more likely the tailing or afterimage phenomenon is caused. The response time of the liquid crystal display device can be improved by using a driving technology to reduce the trailing or afterimage phenomenon. However, excessive driving causes the liquid crystal display device to generate an inverse image sticking phenomenon, and in order to solve the inverse image sticking phenomenon, a frame buffer compression technique or a line buffer compression technique needs to be used, which results in a complicated hardware structure, an increased size, and an increased cost.
Further, the applicant found that the luminance of the liquid crystal display device is related to the luminance of the backlight unit and the rotation angle of the liquid crystal molecules. Generally, when a liquid crystal display device switches frames, different frames can display different brightness by adjusting the rotation angle of liquid crystal molecules, but the rotation speed of the liquid crystal molecules is slow, so that the response time of the liquid crystal display device is long, and a trailing or residual image phenomenon exists during frame switching. Therefore, the brightness of the backlight unit can be adjusted by using Pulse Amplitude Modulation (PAM) and/or Pulse Width Modulation (PWM) to enable the liquid crystal display device to rapidly reach a brightness close to the target brightness before reaching the target brightness so as to improve the response time of the liquid crystal display device, and further, a frame buffer compression technology or a line buffer compression technology is not required to be used, so that the hardware structure is simplified, the size of the hardware structure is reduced, and the cost is reduced.
As one implementation, the rotation speed of liquid crystal molecules in the liquid crystal display device may be adjusted using a driving technique while adjusting the brightness of the backlight unit using a pulse amplitude modulation and/or a pulse width modulation scheme. The brightness of the backlight unit is adjusted through a pulse amplitude modulation and/or pulse width modulation mode, so that the brightness change speed of the liquid crystal display device is accelerated, the liquid crystal molecule rotation speed is improved, the brightness change speed of the liquid crystal display device is further accelerated, and the response time of the liquid crystal display device is prolonged.
For example, when the brightness of the liquid crystal display device is changed from low brightness to high brightness, the current brightness of the backlight unit may be increased to a very high brightness, i.e., an intermediate brightness, by pulse amplitude modulation and/or pulse width modulation, and then the brightness of the backlight unit may be decreased from the very high brightness to a reference brightness, where the very high brightness may be understood as a brightness greater than the current brightness of the backlight unit and the reference brightness, and the reference brightness may be understood as a brightness of the backlight unit when the liquid crystal display device displays a target brightness.
In addition, in the process of adjusting the current brightness of the backlight unit to a very high brightness, the rotation speed of the liquid crystal molecules is increased by the overdrive technology to increase the rotation angle of the liquid crystal molecules, increase the light transmittance, and further enable the brightness of the liquid crystal display device to quickly approach the target brightness. The overdrive technique is to apply a large voltage to the liquid crystal display device.
When the brightness of the liquid crystal display device is changed from high brightness to low brightness, the current brightness of the backlight unit can be reduced to a very low brightness, i.e. an intermediate brightness, by pulse amplitude modulation and/or pulse width modulation, and the very low brightness can be understood as a brightness smaller than the current brightness of the backlight unit and the reference brightness. In the process of adjusting the current brightness of the backlight unit to a very low brightness, the rotation speed of the liquid crystal molecules is increased by a low-driving technology to reduce the rotation angle of the liquid crystal molecules and reduce the light transmittance, so that the brightness of the liquid crystal display device quickly approaches to the target brightness. The low driving technique means that a small voltage is applied to the liquid crystal display device. The brightness of the backlight unit is adjusted through a pulse amplitude modulation and/or pulse width modulation mode to compensate the brightness value of the liquid crystal display device, so that the brightness of the liquid crystal display device quickly approaches the target brightness, the response speed of the liquid crystal display device is improved, and the response time of the liquid crystal display device is shortened.
In a specific application, the backlight unit includes light emitting diodes, and the light emitting intensity of the light emitting diodes can be adjusted through a pulse amplitude modulation and/or a pulse width modulation manner so as to adjust the brightness of the backlight unit from the current brightness to the intermediate brightness.
The intermediate brightness may be greater than or less than the reference brightness, and when the intermediate brightness is greater than the reference brightness, the brightness of the backlight unit may be increased by a pulse amplitude modulation scheme and/or a pulse width modulation scheme to increase the brightness of the backlight unit from the current brightness to the intermediate brightness, so that the brightness of the liquid crystal display device is increased from one brightness to a brightness approaching the target brightness. When the intermediate brightness is smaller than the reference brightness, the brightness of the backlight unit can be reduced through a pulse amplitude modulation mode and/or a pulse width modulation mode, so that the brightness of the backlight unit is reduced from the current brightness to the intermediate brightness, and the brightness of the liquid crystal display device is reduced to the brightness approaching the target brightness.
And S102, adjusting the brightness of the backlight unit from the middle brightness to the reference brightness through a modulation mode so as to enable the liquid crystal display device to display the target brightness.
After the response speed of the liquid crystal display device is increased by compensating the brightness of the liquid crystal display device, the brightness of the liquid crystal display device needs to be adjusted to a target brightness value so that the liquid crystal display device displays a required picture. And adjusting the brightness of the backlight unit from the middle brightness to the reference brightness by a pulse amplitude modulation mode and/or a pulse width modulation mode, wherein when the brightness of the backlight unit is the reference brightness, the liquid crystal display device can display the target brightness.
As one implementation, the luminance of the backlight unit may be adjusted from the intermediate luminance to the reference luminance by a pulse amplitude modulation and/or a pulse width modulation method while adjusting the rotation speed of liquid crystal molecules in the liquid crystal display device by a driving technique so that the liquid crystal display device displays the target luminance.
When the intermediate brightness is greater than the current brightness and the intermediate brightness value is greater than the reference brightness, the brightness of the backlight unit is reduced to the reference brightness by a pulse amplitude modulation method and/or a pulse width modulation method so that the liquid crystal display device displays the target brightness. For example, when the current frame of the liquid crystal display device includes a plurality of sequentially ordered sub-frames, the brightness of the backlight unit may be increased to an intermediate brightness by a pulse amplitude modulation method and/or a pulse width modulation method, so that the brightness of the first sub-frame of the liquid crystal display device is increased to a reference brightness, and the reference brightness approaches to a target brightness of the target frame. Then, the brightness of the backlight unit is gradually reduced through a pulse amplitude modulation mode and/or a pulse width modulation mode, so that the brightness of the backlight unit is gradually reduced from the middle brightness to the reference brightness, and the brightness from the second sub-frame to the last sub-frame gradually approaches the target brightness until the target frame of the liquid crystal display device displays the target brightness. That is, the closer to the target frame, the smaller the luminance of the backlight unit, so that the luminance of the liquid crystal display device approaches the target luminance to the target luminance.
Referring to fig. 2, the nth frame is a current frame, the (n + 1) th frame and the (n + 2) th frame are target frames, the nth frame is divided into a plurality of sub-frames, for example, four sub-frames, which are respectively called as a first sub-frame, a second sub-frame, a third sub-frame and a fourth sub-frame, the first sub-frame is a first sub-frame in the current frame, the fourth sub-frame is a last sub-frame in the current frame, the brightness of the backlight unit is increased from the current brightness to the intermediate brightness by a pulse amplitude modulation method and/or a pulse width modulation method, so that the brightness of the first sub-frame is increased to the reference brightness, the reference brightness is close to the target brightness, the brightness of the backlight unit is gradually decreased by the pulse amplitude modulation method and/or the pulse width modulation method, so that the brightness of the second sub-frame, the third sub-frame and the fourth sub-frame is closer to the target brightness, when the brightness of the backlight unit is decreased to the reference brightness, the target brightness of the (n + 1) th frame display of the liquid crystal display device, namely the target brightness of the target frame display, is increased to a great intermediate brightness by increasing the brightness of the backlight unit, so that the brightness of the liquid crystal display device quickly reaches a brightness approaching the target brightness before reaching the target brightness. Referring to the graph in fig. 2, a graph 11 represents the response time of the liquid crystal display device without any adjustment, and a graph 12 represents the response time of the liquid crystal display device when adjusted by the over driving technique (over driving), as described above, the response time of the liquid crystal display device is more significantly shortened when adjusted by the backlight.
When the intermediate brightness is less than the current brightness and the intermediate brightness is less than the reference brightness, the brightness of the backlight unit is increased to the reference brightness by a pulse amplitude modulation method and/or a pulse width modulation method so that the liquid crystal display device displays the target brightness. For example, when the current frame of the liquid crystal display device includes a plurality of sequentially ordered sub-frames, the brightness of the backlight unit may be reduced to an intermediate brightness by a pulse amplitude modulation method and/or a pulse width modulation method, so that the brightness of the first sub-frame of the liquid crystal display device is reduced to a reference brightness. Then, the brightness of the backlight unit can be gradually increased through a pulse amplitude modulation mode and/or a pulse width modulation mode, so that the brightness of the backlight unit is gradually increased from the middle brightness to the reference brightness, and the brightness of the second sub-frame to the last sub-frame gradually approaches the target brightness until the target frame of the liquid crystal display device displays the target brightness. That is, the closer to the target frame, the greater the luminance of the backlight unit, so that the luminance of the liquid crystal display device approaches the target luminance to the target luminance.
Referring to fig. 3, the nth frame is a current frame, the (n + 1) th frame and the (n + 2) th frame are target frames, the nth frame is divided into a plurality of sub-frames, for example, four sub-frames, which are respectively called as a first sub-frame, a second sub-frame, a third sub-frame and a fourth sub-frame, the first sub-frame is a first sub-frame in the current frame, the fourth sub-frame is a last sub-frame in the current frame, the brightness of the backlight unit is reduced from the current brightness to the middle brightness by a pulse amplitude modulation method and/or a pulse width modulation method, so that the brightness of the first sub-frame is increased to the reference brightness, the reference brightness is close to the target brightness, the brightness of the backlight unit is gradually increased by the pulse amplitude modulation method and/or the pulse width modulation method, so that the brightness of the second sub-frame, the third sub-frame and the fourth sub-frame is closer to the target brightness, when the brightness of the backlight unit is increased to the reference brightness, the n +1 th frame of the lcd device displays the target brightness, i.e. the target frame displays the target brightness, by reducing the brightness of the backlight unit to a very small intermediate brightness, so that the brightness of the lcd device quickly reaches a brightness approaching the target brightness before reaching the target brightness and as shown by referring to the curve in fig. 3, the curve 31 represents the response time of the lcd device without any adjustment, and the curve 32 represents the response time of the lcd device when adjusted by the low driving technique (under driving), as mentioned above, the response time of the lcd device is more significantly shortened when adjusted by the backlight.
According to the method for adjusting the brightness, the brightness of the backlight unit is adjusted in a pulse amplitude modulation and/or pulse width modulation mode, so that the brightness of the liquid crystal display device can quickly reach the brightness close to the target brightness before reaching the target brightness, excessive hardware circuit structures are not needed, and the cost is reduced. And the inverse ghost phenomenon caused by over-driving can not be generated by the pulse amplitude modulation and/or the pulse width modulation mode. And the response time of the liquid crystal display device is shortened by adjusting the brightness of the backlight unit, and the trailing or afterimage phenomenon of the liquid crystal display device is reduced.
Fig. 4 is a schematic structural diagram of an apparatus for adjusting brightness according to an embodiment of the present application, and as shown in fig. 4, the apparatus 10 for adjusting brightness according to the present embodiment is used to implement operations corresponding to the electronic device in any of the method embodiments described above, where the apparatus 10 for adjusting brightness according to the present embodiment includes:
the first adjusting module 11 is configured to adjust the brightness of the backlight unit from a current brightness to an intermediate brightness through a modulation method, where the modulation method includes pulse amplitude modulation and/or pulse width modulation;
the second adjusting module 12 is configured to adjust the brightness of the backlight unit from the intermediate brightness to the reference brightness through a modulation method, so that the liquid crystal display device displays the target brightness;
and the absolute value of the difference value between the intermediate brightness and the reference brightness is greater than a preset value.
The device 10 for adjusting brightness provided in the embodiment of the present application may implement the above method embodiment, and for details of the implementation principle and the technical effect, reference may be made to the above method embodiment, which is not described herein again.
Fig. 5 shows a display device provided by an embodiment of the present application, which includes the above-mentioned brightness adjusting device 10, the backlight unit 20 and the liquid crystal display device 30, wherein the backlight unit 20 is connected with the brightness adjusting device 10 and the liquid crystal display device 30;
the apparatus for adjusting luminance 10 is used to adjust the luminance of the backlight unit 20 to adjust the luminance of the liquid crystal display device 30.
In the present embodiment, the apparatus for adjusting luminance 10 can adjust the luminance of the backlight unit 20 by adjusting the luminance of the backlight unit 20, and since the luminance of the backlight unit 20 corresponds to the luminance of the liquid crystal display device 30, the luminance of the liquid crystal display device 30 can be adjusted by adjusting the luminance of the backlight unit 20.
As one implementation, the backlight unit 20 may be an active matrix type mini light emitting diode. The active matrix type mini light emitting diode can realize ultrahigh contrast and improve brightness and contrast by combining with fine overall brightness adjustment (local dimming).
Fig. 6 shows a hardware structure diagram of an electronic device according to an embodiment of the present application. As shown in fig. 6, the electronic device 40 is configured to implement the operations corresponding to the electronic device in any of the method embodiments described above, where the electronic device 40 of this embodiment may include: a memory 41, a processor 42 and a communication interface 43.
A memory 41 for storing computer instructions. The Memory 41 may include a Random Access Memory (RAM), a Non-Volatile Memory (NVM), at least one disk Memory, a usb disk, a removable hard disk, a read-only Memory, a magnetic disk or an optical disk.
A processor 42 for executing computer instructions stored by the memory to implement the method of adjusting brightness in the above embodiments. Reference may be made in particular to the description relating to the method embodiments described above. The Processor 42 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
Alternatively, the memory 41 may be separate or integrated with the processor 42.
A communication interface 43 may be coupled to the processor 42. Processor 42 may control communication interface 43 to perform the functions of receiving and transmitting signals.
The electronic device provided in this embodiment can be used to execute the method for adjusting brightness, and the implementation manner and the technical effect are similar, and this embodiment is not described herein again.
The present application also provides a computer readable storage medium, in which computer instructions are stored, and the computer instructions are executed by a processor to implement the methods provided by the above-mentioned various embodiments.
The present application also provides a computer program product comprising computer instructions stored in a computer readable storage medium. The computer instructions may be read by at least one processor of the device from a computer-readable storage medium, and execution of the computer instructions by the at least one processor causes the device to perform the methods provided by the various embodiments described above.
The embodiment of the present application further provides a chip, which includes a memory and a processor, where the memory is used to store computer instructions, and the processor is used to call and execute the computer instructions from the memory, so that a device in which the chip is installed executes the method described in the above various possible embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: it is also possible to modify the solutions described in the previous embodiments or to substitute some or all of them with equivalents. And the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A method of adjusting brightness, the method comprising:
adjusting the brightness of the backlight unit from the current brightness to the intermediate brightness through a modulation mode, wherein the modulation mode comprises pulse amplitude modulation and/or pulse width modulation;
adjusting the brightness of the backlight unit from the intermediate brightness to the reference brightness through the modulation mode so as to enable the liquid crystal display device to display the target brightness;
and the absolute value of the difference value between the intermediate brightness and the reference brightness is greater than a preset value.
2. The method of claim 1, further comprising:
the rotation speed of liquid crystal molecules in the liquid crystal display device is adjusted by a driving technique.
3. The method of claim 1, wherein the backlight unit comprises light emitting diodes;
the adjusting the brightness of the backlight unit from the current brightness to the intermediate brightness by the modulation method specifically includes:
and adjusting the light emitting intensity of the light emitting diodes in a modulation mode to adjust the brightness of the backlight unit from the current brightness to the intermediate brightness.
4. The method according to claim 1, wherein the intermediate luminance is greater than the reference luminance;
the adjusting the brightness of the backlight unit from the current brightness to the intermediate brightness by the modulation method specifically includes:
increasing the brightness of a backlight unit through a modulation mode so as to enable the brightness of the backlight unit to be from the current brightness to the intermediate brightness;
correspondingly, the adjusting the brightness of the backlight unit from the intermediate brightness to the reference brightness by the modulation method to enable the liquid crystal display device to display the target brightness specifically includes:
and reducing the brightness of the backlight unit by the modulation mode so that the brightness of the backlight unit is from the intermediate brightness to the reference brightness, so that the liquid crystal display device displays the target brightness.
5. The method according to claim 1, wherein the intermediate luminance is smaller than the reference luminance;
the adjusting the brightness of the backlight unit from the current brightness to the intermediate brightness by the modulation method specifically includes:
reducing the brightness of a backlight unit through a modulation mode so as to enable the brightness of the backlight unit to be from the current brightness to the intermediate brightness;
correspondingly, the adjusting the brightness of the backlight unit from the intermediate brightness to the reference brightness by the modulation method to enable the liquid crystal display device to display the target brightness specifically includes:
and increasing the brightness of the backlight unit from the intermediate brightness to the reference brightness through the modulation mode so that the liquid crystal display device displays the target brightness.
6. The method according to claim 4, wherein the current frame of the LCD device comprises a plurality of sequentially ordered sub-frames;
the increasing the brightness of the backlight unit by the modulation method to make the brightness of the backlight unit from the current brightness to the intermediate brightness specifically includes:
increasing the brightness of a backlight unit through a modulation mode so that the brightness of the backlight unit is from the current brightness to the intermediate brightness, and the brightness of a first subframe displayed by the liquid crystal display device is from the reference brightness;
the reducing the brightness of the backlight unit from the intermediate brightness to the reference brightness by the modulation method to enable the liquid crystal display device to display the target brightness specifically includes:
and gradually reducing the brightness of the backlight unit through the modulation mode so as to gradually reduce the brightness of the backlight unit from the middle brightness to the reference brightness, so that the brightness of the second sub-frame to the last sub-frame displayed by the liquid crystal display device gradually approaches the target brightness until the target frame of the liquid crystal display device displays the target brightness.
7. The method of claim 5, wherein the current frame of the LCD device comprises a plurality of sequentially ordered sub-frames;
reducing the brightness of the backlight unit through a modulation mode so as to enable the brightness of the backlight unit to be from the current brightness to the intermediate brightness, specifically comprising:
reducing the brightness of the backlight unit through a modulation mode so that the brightness of the backlight unit is from the current brightness to the intermediate brightness, and the brightness of the first subframe displayed by the liquid crystal display device is from the reference brightness;
the increasing the brightness of the backlight unit by a modulation method to enable the liquid crystal display device to display the target brightness specifically includes:
and gradually increasing the brightness of the backlight unit through the modulation mode so as to gradually increase the brightness of the backlight unit from the middle brightness to the reference brightness, so that the brightness of the second sub-frame to the last sub-frame displayed by the liquid crystal display device gradually approaches the target brightness until the target frame of the liquid crystal display device displays the target brightness.
8. The method according to claim 2, wherein the adjusting the rotation speed of the liquid crystal molecules in the liquid crystal display device by the driving technique comprises:
the rotation speed of liquid crystal molecules in the liquid crystal display device is increased by applying a voltage to the liquid crystal display device.
9. An apparatus for adjusting brightness, the apparatus comprising:
the first adjusting module is used for adjusting the brightness of the backlight unit from the current brightness to the intermediate brightness through a modulation mode, wherein the modulation mode comprises pulse amplitude modulation and/or pulse width modulation;
the second adjusting module is used for adjusting the brightness of the backlight unit from the intermediate brightness to the reference brightness through the modulation mode so as to enable the liquid crystal display device to display the target brightness;
and the absolute value of the difference value between the intermediate brightness and the reference brightness is greater than a preset value.
10. A display apparatus comprising the luminance adjusting device according to claim 9, a backlight unit and a liquid crystal display device, the backlight unit being connected to the luminance adjusting device and the liquid crystal display device;
the device for adjusting the brightness is used for adjusting the brightness of the backlight unit so as to adjust the brightness of the liquid crystal display device.
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