CN109949752B - Regional display brightness adjusting method, playing terminal and storage medium - Google Patents
Regional display brightness adjusting method, playing terminal and storage medium Download PDFInfo
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Abstract
The invention discloses a regional display brightness adjusting method, a playing terminal and a storage medium, wherein the method comprises the following steps: adjusting the backlight power test value to a maximum value, and recording the number of the lighted backlight partitions and a register value corresponding to the duty ratio of PWM with a first preset size; dividing the selected partition number into a plurality of equal parts, increasing the number of the backlight partitions according to a certain number, recording the number of the backlight partitions of each part, and testing and recording the register value of PWM (pulse width modulation) when the backlight power is maximum; generating a value of 0-255 brightness information corresponding to the PWM duty ratio by each register value according to a second preset size to form a PWM table; and calculating the partition number of which the gray value is greater than 0 under each frame of picture, and comparing the partition number with the backlight partition number one by one to obtain the corresponding PWM duty ratio in a table required to be used by the current frame of picture. The invention improves the brightness in the regional picture display to the maximum extent, thereby improving the contrast of the whole display picture.
Description
Technical Field
The present invention relates to the field of backlight display technologies, and in particular, to a method for adjusting brightness of an area display, a display terminal, and a storage medium.
Background
The current television greatly improves the brightness of a picture area in OLED display, when a full white field picture is displayed, the brightness is assumed to be 300nit (nit, nit is a unit of brightness, 1nit =1 cd/m), and when a small window white field is displayed, the brightness can be obviously improved, so that the contrast of the OLED is improved.
However, the technology only exists in the single-pixel light emitting OLED display, and the technology is blocked abroad, and has no related application in the LCD backlight display, which limits the LCD backlight display to improve the brightness of the picture area.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The invention mainly aims to provide a region display brightness adjusting method, a playing terminal and a storage medium, and aims to solve the problem that the brightness of a picture region cannot be obviously improved in LCD backlight display in the prior art.
In order to achieve the above object, the present invention provides a method for adjusting brightness of area display, comprising the steps of:
adjusting the backlight power test value to a maximum value, and recording the number of the lighted backlight partitions and a register value corresponding to the duty ratio of PWM with a first preset size;
dividing the selected partition number into a plurality of equal parts, increasing the number of the backlight partitions according to a certain number, recording the number of the backlight partitions of each part, and testing and recording the register value of PWM (pulse width modulation) when the backlight power is maximum;
generating a value of 0-255 brightness information corresponding to the PWM duty ratio by each register value according to a second preset size to form a PWM table;
and calculating the partition number of which the gray value is greater than 0 under each frame of picture, and comparing the partition number with the backlight partition number one by one to obtain the corresponding PWM duty ratio in a table required to be used by the current frame of picture.
Optionally, the method for adjusting the area display brightness, wherein the step of adjusting the backlight power test value to a maximum value and recording a register value corresponding to the number of lighted backlight partitions and a duty ratio of PWM of a first preset size includes:
adjusting the backlight power test value to a maximum value, and presetting a brightness value when the backlight power is maximum;
register value D1 corresponding to the lighted backlight partition number BLOCK _1 and the duty ratio of the PWM of the first preset size is recorded.
Optionally, the area display brightness adjusting method, wherein the backlight power is at most 280W; the first preset size is 13 bits.
Optionally, the method for adjusting the area display brightness, wherein the step of dividing the selected number of partitions into a plurality of equal parts, incrementing and recording the number of backlight partitions of each part by a certain number, and testing and recording the register value of the PWM when the backlight power is maximum includes:
presetting the size of partition number to 2000, dividing the space between BLOCK _1 and BLOCK _ 2000 into a plurality of equal parts, and increasing the number of equal parts according to a certain number;
each record is BLOCK _ x, and the register value Dx of PWM at backlight power 280W is tested and recorded.
Optionally, the method for adjusting regional display brightness, wherein the step of generating the value of the PWM duty ratio corresponding to the brightness information of 0 to 255 from each register value according to a second preset size to form a PWM table includes:
presetting a second preset size, and acquiring each register value;
and generating values of 0-255 brightness information corresponding to the PWM duty ratio by each register value according to a second preset size, and forming a PWM table.
Optionally, the area display brightness adjustment method, wherein the second preset size is 8 bits.
Optionally, the method for adjusting regional display brightness, wherein the step of calculating the number of partitions whose gray scale value is greater than 0 in each frame of picture, and comparing the number of partitions with the number of backlight partitions one by one to obtain the corresponding PWM duty ratio in a table that needs to be used by the current frame of picture includes:
calculating the block number of partitions with the gray value larger than 0 under each frame of picture through a program;
and comparing the partition number BLOCK with the BLOCK _ x one by one to obtain the corresponding PWM duty ratio in a table required to be used by the current frame.
Optionally, the method for adjusting regional display brightness, wherein the step of calculating the number of partitions whose gray scale value is greater than 0 in each frame of picture, and comparing the number of partitions with the number of backlight partitions one by one to obtain the corresponding PWM duty ratio in the table that needs to be used by the current frame of picture further includes:
and the main chip or the FPGA calculates a table which is required to correspond to the backlight drive corresponding to the current frame picture through the brightness information table.
In addition, to achieve the above object, the present invention further provides a broadcasting terminal, where at least one broadcasting terminal is provided, and the broadcasting terminal includes: the system comprises a memory, a processor and a regional display brightness adjusting program which is stored on the memory and can run on the processor, wherein the regional display brightness adjusting program realizes the steps of the regional display brightness adjusting method when being executed by the processor.
In addition, to achieve the above object, the present invention further provides a storage medium, wherein the storage medium stores an area display luminance adjusting program, and the area display luminance adjusting program implements the steps of the area display luminance adjusting method as described above when executed by a processor.
The backlight power test value is adjusted to the maximum value, and the register value corresponding to the number of the lighted backlight partitions and the duty ratio of PWM with the first preset size is recorded; dividing the selected partition number into a plurality of equal parts, increasing the number of the backlight partitions according to a certain number, recording the number of the backlight partitions of each part, and testing and recording the register value of PWM (pulse width modulation) when the backlight power is maximum; generating a value of 0-255 brightness information corresponding to the PWM duty ratio by each register value according to a second preset size to form a PWM table; and calculating the partition number of which the gray value is greater than 0 under each frame of picture, and comparing the partition number with the backlight partition number one by one to obtain the corresponding PWM duty ratio in a table required to be used by the current frame of picture. On the premise of limiting the maximum backlight power, the invention maximally improves the brightness in regional image display, thereby improving the contrast of the whole display image, meeting the requirement of HDR on the maximum brightness and reducing the power requirement on a backlight power supply.
Drawings
FIG. 1 is a flow chart of a method for adjusting brightness of an area display according to a preferred embodiment of the present invention;
FIG. 2 is a flowchart of step S10 in the preferred embodiment of the area display brightness adjustment method according to the invention;
FIG. 3 is a flowchart of step S20 in the preferred embodiment of the area display brightness adjustment method according to the invention;
FIG. 4 is a flowchart illustrating the step S30 of the area display brightness adjusting method according to the present invention;
FIG. 5 is a flowchart illustrating the step S40 of the area display brightness adjusting method according to the present invention;
FIG. 6 is a table showing the relationship between the duty ratio of the gray-scale value 255 and the PWM when the backlight power is maximum according to the preferred embodiment of the method for adjusting the brightness of the area display;
FIG. 7 is a display diagram illustrating the maximum backlight power of a full-white-field image according to the preferred embodiment of the area display brightness adjustment method of the present invention;
FIG. 8 is a schematic diagram of the display of a still image or a moving image with a distinct luminance transition of pixel blocks according to the preferred embodiment of the method for adjusting the regional display luminance;
FIG. 9 is a schematic diagram illustrating a relationship between a white square on-screen ratio and a luminance satisfaction within a power variation range of a backlight source in a preferred embodiment of the area display luminance adjusting method of the present invention;
fig. 10 is a schematic operating environment diagram of a playback terminal according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the method for adjusting the area display brightness according to the preferred embodiment of the present invention includes the following steps:
and step S10, adjusting the backlight power test value to the maximum value, and recording the register value corresponding to the number of the lighted backlight partitions and the duty ratio of the PWM with the first preset size.
Please refer to fig. 2, which is a flowchart of step S10 in the method for adjusting brightness of area display according to the present invention.
As shown in fig. 2, the step S10 includes:
s11, adjusting the backlight power test value to the maximum value, and presetting the brightness value when the backlight power is maximum;
s12, recording the number of lighted backlight partitions BLOCK _1 and the register value D1 corresponding to the duty ratio of the PWM with the first preset size.
Specifically, by taking 2000 partitions as an example, suppose that the maximum power of the backlight power supply is 280W (i.e. the maximum backlight power is 280W), the corresponding full white field brightness is 500nit, the brightness information of the backlight of each partition is 8bit, and the PWM driving is 13bit (i.e. the first preset size is 13 bit).
The real-time power of the backlight can not exceed the maximum value (280W) all the time, and the brightness of 255 gray scales is different according to different conditions, so that the backlight driving PWM is divided into a plurality of groups, and when the brightness information of 2000 partitions meets a certain condition range, the backlight driving adopts a certain group of PWM driving.
Then, when the test backlight power is at maximum (280W), assuming that the brightness reaches 1000nit, register value D1 corresponding to the number of lit backlight partitions BLOCK _1 and the duty cycle of PWM of 13bit is recorded.
And step S20, dividing the selected partition number into a plurality of equal parts, increasing and recording the backlight partition number of each part according to a certain number, and testing and recording the register value of PWM when the backlight power is maximum.
Please refer to fig. 3, which is a flowchart of step S20 in the method for adjusting brightness of area display according to the present invention.
As shown in fig. 3, the step S20 includes:
s21, presetting the partition number to 2000, dividing the space between BLOCK _1-2000 into a plurality of equal parts, and increasing the number of equal parts according to a certain number;
s22, each recorded as BLOCK _ x, and testing and recording the register value Dx of PWM at backlight power of 280W.
Specifically, the space between BLOCK _1 and BLOCK _ 2000 is divided into a plurality of equal parts, the equal parts are increased by a certain number, each part is recorded as BLOCK _ x, and the PWM register value Dx when the backlight power is 280W is tested and recorded.
And step S30, generating values of the brightness information of 0-255 corresponding to the PWM duty ratio according to the second preset value by each register value, and forming a PWM table.
Please refer to fig. 4, which is a flowchart of step S30 in the method for adjusting brightness of area display according to the present invention.
As shown in fig. 4, the step S30 includes:
s31, presetting a second preset size, and acquiring each register value;
and S32, generating values of the brightness information of 0-255 corresponding to the PWM duty ratio according to each register value according to a preset second preset size, and forming a PWM table.
Specifically, each Dx generates table _ x of 0-255 luminance information corresponding to the PWM duty ratio according to 8 bits (i.e., the second preset size is 8 bits).
And step S40, calculating the partition number of which the gray value is greater than 0 under each frame of picture, and comparing the partition number with the backlight partition number one by one to obtain the corresponding PWM duty ratio in a table required to be used by the current frame of picture.
Please refer to fig. 5, which is a flowchart of step S40 in the method for adjusting brightness of area display according to the present invention.
As shown in fig. 5, the step S40 includes:
s41, calculating the block number of the partitions with the gray value larger than 0 under each frame of picture through a program;
and S42, comparing the partition number BLOCK with the BLOCK _ x one by one to obtain the corresponding PWM duty ratio in a table needed to be used by the current frame picture.
Specifically, the program calculates the number of partitions BLOCK with a gray value greater than 0 in each frame, and compares BLOCK with BLOCK _ x one by one to obtain a table to be used by the frame, where the table is shown in fig. 6 for 255 gray values, the duty ratio and the PWM when the backlight power is maximum.
The invention is an innovation on the existing multi-partition partitioning backlight driving, and aims to improve the brightness of regional display, thereby improving the display contrast, saving the power supply, reducing the cost, breaking the technical monopoly of foreign OLEDs on the display algorithm, and being applied to the low-cost LCD liquid crystal display.
Further, the main chip or the FPGA calculates a table required to correspond to the backlight driver corresponding to the current frame picture through the luminance information table, and the implementation process is as follows:
If（block＞0）
{
if（block＜=BLOCK _1）
use (table _ 1); // backlight drive Using table1
else if（BLOCK _1＜block＜=BLOCK _2）
use (table _ 2); // backlight drive Using table2
else if（BLOCK _2＜block＜=BLOCK _3）
use (table _ 3); // backlight drive Using table3
else if（BLOCK _3＜block＜=BLOCK _4）
use (table _ 4); // backlight drive Using table4
·
·
·
}
Further, the backlight control algorithm is as follows:
(1) in the full white field, the backlight power reaches the maximum, and the brightness of the full white field is assumed to be 500nit at this time, as shown in fig. 7;
(2) when the brightness of the pixel block appears excessively obvious in a static picture or a dynamic picture (for example, a white square appears in the picture, and the rest is completely black), within the range of backlight power, the brighter the bright place is required to be, that is, the brightness of the color-changing block is brighter than that of a full white field, and it is assumed that the brightest white square can reach 1000nit, as shown in fig. 8;
(3) in the power variation range of the backlight power supply, the screen occupation ratio of the white square and the brightness satisfy a certain curve relationship, as shown in fig. 9;
(4) the initial design of the maximum power of the current backlight power supply is 280W, therefore, the sum of all the divisional backlight powers during display must be less than or equal to 280W, i.e.
。
The invention is suitable for the field of LCD (liquid crystal display) of multi-partition partitioning backlight, and can be applied to scanning type partitioning backlight driving and point-to-point partitioning backlight driving. On the premise of limiting the maximum backlight power, the brightness in the area image display is improved to the maximum, so that the contrast of the whole display image is improved, the requirement of HDR on the maximum brightness is met, and the power requirement on a backlight power supply is reduced.
Further, as shown in fig. 10, based on the above method for adjusting the area display brightness, the present invention also provides a corresponding playback terminal, where the playback terminal includes a processor 10, a memory 20, and a display 30. Fig. 10 shows only some of the components of the cast terminal, but it is to be understood that not all of the shown components are required to be implemented, and that more or fewer components may be implemented instead.
The storage 20 may be an internal storage unit of the playback terminal in some embodiments, for example, a hard disk or a memory of the playback terminal. The memory 20 may also be an external storage device of the playback terminal in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are equipped on the playback terminal. Further, the memory 20 may also include both an internal storage unit and an external storage device of the cast terminal. The memory 20 is used for storing application software installed in the broadcast terminal and various data, such as program codes of the installed broadcast terminal. The memory 20 may also be used to temporarily store data that has been output or is to be output. In an embodiment, the memory 20 stores a region display brightness adjustment program 40, and the region display brightness adjustment program 40 can be executed by the processor 10, so as to implement the region display brightness adjustment method in the present application.
The processor 10 may be a Central Processing Unit (CPU), a microprocessor or other data Processing chip in some embodiments, and is used for running program codes stored in the memory 20 or Processing data, such as executing the area display brightness adjusting method.
The display 30 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch panel, or the like in some embodiments. The display 30 is used for displaying information at the playback terminal and for displaying a visual user interface. The components 10-30 of the cast terminal communicate with each other via a system bus.
In one embodiment, when the processor 10 executes the area display brightness adjustment program 40 in the memory 20, the following steps are implemented:
adjusting the backlight power test value to a maximum value, and recording the number of the lighted backlight partitions and a register value corresponding to the duty ratio of PWM with a first preset size;
dividing the selected partition number into a plurality of equal parts, increasing the number of the backlight partitions according to a certain number, recording the number of the backlight partitions of each part, and testing and recording the register value of PWM (pulse width modulation) when the backlight power is maximum;
generating a value of 0-255 brightness information corresponding to the PWM duty ratio by each register value according to a second preset size to form a PWM table;
and calculating the partition number of which the gray value is greater than 0 under each frame of picture, and comparing the partition number with the backlight partition number one by one to obtain the corresponding PWM duty ratio in a table required to be used by the current frame of picture.
The step of adjusting the backlight power test value to a maximum value and recording the register value corresponding to the number of the lighted backlight partitions and the duty ratio of the first preset PWM includes:
adjusting the backlight power test value to a maximum value, and presetting a brightness value when the backlight power is maximum;
register value D1 corresponding to the lighted backlight partition number BLOCK _1 and the duty ratio of the PWM of the first preset size is recorded.
Wherein the backlight power is at most 280W; the first preset size is 13 bits.
The step of dividing the selected partition number into a plurality of equal parts, increasing the number of the backlight partitions according to a certain number and recording the number of the backlight partitions of each part, and testing and recording the register value of the PWM when the backlight power is maximum comprises the following steps:
presetting the size of partition number to 2000, dividing the space between BLOCK _1 and BLOCK _ 2000 into a plurality of equal parts, and increasing the number of equal parts according to a certain number;
each record is BLOCK _ x, and the register value Dx of PWM at backlight power 280W is tested and recorded.
The step of generating the value of the PWM duty ratio corresponding to the luminance information of 0-255 by each register value according to the second preset size to form a PWM table comprises the following steps:
presetting a second preset size, and acquiring each register value;
and generating values of 0-255 brightness information corresponding to the PWM duty ratio by each register value according to a second preset size, and forming a PWM table.
Wherein the second preset size is 8 bits.
The step of calculating the partition number of which the gray value is greater than 0 under each frame of picture, and comparing the partition number with the backlight partition number one by one to obtain the corresponding PWM duty ratio in the table needed to be used by the current frame of picture comprises the following steps:
calculating the block number of partitions with the gray value larger than 0 under each frame of picture through a program;
and comparing the partition number BLOCK with the BLOCK _ x one by one to obtain the corresponding PWM duty ratio in a table required to be used by the current frame.
The step of calculating the partition number of which the gray value is greater than 0 under each frame of picture, and comparing the partition number with the backlight partition number one by one to obtain the corresponding PWM duty ratio in the table needed to be used by the current frame of picture further comprises the following steps:
and the main chip or the FPGA calculates a table which is required to correspond to the backlight drive corresponding to the current frame picture through the brightness information table.
The present invention also provides a storage medium, wherein the storage medium stores an area display brightness adjustment program, and the area display brightness adjustment program realizes the steps of the area display brightness adjustment method when executed by a processor.
In summary, the present invention provides a method for adjusting brightness of area display, a playing terminal and a storage medium, wherein the method includes: adjusting the backlight power test value to a maximum value, and recording the number of the lighted backlight partitions and a register value corresponding to the duty ratio of PWM with a first preset size; dividing the selected partition number into a plurality of equal parts, increasing the number of the backlight partitions according to a certain number, recording the number of the backlight partitions of each part, and testing and recording the register value of PWM (pulse width modulation) when the backlight power is maximum; generating a value of 0-255 brightness information corresponding to the PWM duty ratio by each register value according to a second preset size to form a PWM table; and calculating the partition number of which the gray value is greater than 0 under each frame of picture, and comparing the partition number with the backlight partition number one by one to obtain the corresponding PWM duty ratio in a table required to be used by the current frame of picture. On the premise of limiting the maximum backlight power, the invention maximally improves the brightness in regional image display, thereby improving the contrast of the whole display image, meeting the requirement of HDR on the maximum brightness and reducing the power requirement on a backlight power supply.
Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program instructing relevant hardware (such as a processor, a controller, etc.), and the program may be stored in a computer readable storage medium, and when executed, the program may include the processes of the above method embodiments. The storage medium may be a memory, a magnetic disk, an optical disk, etc.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A region display brightness adjusting method is characterized by comprising the following steps: adjusting the backlight power test value to a maximum value, and recording the number of the lighted backlight partitions and a register value corresponding to the duty ratio of PWM with a first preset size;
dividing the selected partition number into a plurality of equal parts, increasing the number of the backlight partitions according to a certain number, recording the number of the backlight partitions of each part, and testing and recording the register value of PWM (pulse width modulation) when the backlight power is maximum;
generating a value of 0-255 brightness information corresponding to the PWM duty ratio by each register value according to a second preset size to form a PWM table;
calculating the partition number of which the gray value is greater than 0 under each frame of picture, and comparing the partition number with the backlight partition number one by one to obtain the corresponding PWM duty ratio in a table required to be used by the current frame of picture;
under the limitation of the maximum backlight power, the brightness in the area image display is improved to the maximum.
2. The method according to claim 1, wherein the step of adjusting the backlight power test value to a maximum value and recording the register value corresponding to the number of the lighted backlight partitions and the duty ratio of the PWM of the first preset size comprises:
adjusting the backlight power test value to a maximum value, and presetting a brightness value when the backlight power is maximum;
register value D1 corresponding to the lighted backlight partition number BLOCK _1 and the duty ratio of the PWM of the first preset size is recorded.
3. The area display luminance adjusting method according to claim 2, wherein the backlight power is at most 280W; the first preset size is 13 bits.
4. The method of claim 2, wherein the step of dividing the selected number of partitions into equal parts, incrementing by a certain number and recording the number of backlight partitions of each part, and testing and recording the register value of the PWM when the backlight power is maximum comprises:
presetting the size of partition number to 2000, dividing the space between BLOCK _1 and BLOCK _ 2000 into a plurality of equal parts, and increasing the number of equal parts according to a certain number; each record is BLOCK _ x, and the register value Dx of PWM at backlight power 280W is tested and recorded.
5. The method according to claim 4, wherein the step of generating the value of the PWM duty ratio corresponding to the luminance information of 0-255 from each register value according to a second preset size to form the PWM table comprises the steps of presetting the second preset size and obtaining each register value;
and generating values of 0-255 brightness information corresponding to the PWM duty ratio by each register value according to a second preset size, and forming a PWM table.
6. The method according to claim 5, wherein the second predetermined size is 8 bits.
7. The method according to claim 5, wherein the step of calculating the number of partitions with a gray value greater than 0 in each frame of picture and comparing the number of partitions with the number of backlight partitions one by one to obtain the corresponding PWM duty ratio in the table needed to be used by the current frame of picture comprises:
calculating the block number of partitions with the gray value larger than 0 under each frame of picture through a program;
and comparing the partition number BLOCK with the BLOCK _ x one by one to obtain the corresponding PWM duty ratio in a table required to be used by the current frame.
8. The method according to claim 7, wherein the step of calculating the number of partitions whose gray scale value is greater than 0 for each frame of picture and comparing the number of partitions with the number of backlight partitions one by one to obtain the corresponding PWM duty ratio in the table that needs to be used for the current frame of picture further comprises:
and the main chip or the FPGA calculates a table which is required to correspond to the backlight drive corresponding to the current frame picture through the brightness information table.
9. A cast terminal, characterized in that the cast terminal comprises: a memory, a processor and a region display brightness adjustment program stored on the memory and executable on the processor, the region display brightness adjustment program when executed by the processor implementing the steps of the region display brightness adjustment method according to any one of claims 1 to 8.
10. A storage medium storing an area display luminance adjustment program which, when executed by a processor, implements the steps of the area display luminance adjustment method according to any one of claims 1 to 8.
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| CN113327545B (en) * | 2021-08-04 | 2021-11-02 | 卡莱特云科技股份有限公司 | Method and device for improving picture contrast of LED display screen |
| CN114023268A (en) * | 2021-10-11 | 2022-02-08 | 安徽康佳电子有限公司 | Backlight brightness adjusting method and computer readable storage medium |
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| CN106652920A (en) * | 2016-12-23 | 2017-05-10 | 青岛海信电器股份有限公司 | Backlight control signal generating circuit and method and liquid crystal display equipment |
| CN108053381A (en) * | 2017-12-22 | 2018-05-18 | 深圳创维－Rgb电子有限公司 | Dynamic tone mapping method, mobile terminal and computer readable storage medium |
| CN108962150A (en) * | 2018-06-13 | 2018-12-07 | 深圳创维－Rgb电子有限公司 | Image quality optimization method, apparatus, equipment and storage medium based on local dimming |
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