CN117409706A - LED dimming method and display device - Google Patents

LED dimming method and display device Download PDF

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Publication number
CN117409706A
CN117409706A CN202310380500.1A CN202310380500A CN117409706A CN 117409706 A CN117409706 A CN 117409706A CN 202310380500 A CN202310380500 A CN 202310380500A CN 117409706 A CN117409706 A CN 117409706A
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data
target
pwm
original
pwm count
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王修书
李治国
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Huizhou Shiwei New Technology Co Ltd
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Huizhou Shiwei New Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Led Devices (AREA)

Abstract

The application discloses an LED dimming method and display equipment, wherein the LED dimming method comprises the steps of obtaining original PWM count data in an original PWM driving signal, wherein the original PWM count data comprises z-bit data; acquiring target peak current data, target PWM count data and target PWM period data according to the original PWM count data, wherein the target peak current data is smaller than the original peak current data; the target peak current data comprises x-bit data, the target PWM count data and the target PWM period data comprise y-bit data, x, y and z are positive integers which are larger than 1, and x and y are smaller than z; generating a target PWM driving signal according to the target peak current data, the target PWM count data and the target PWM period data, wherein the duty ratio of the PWM driving signal is larger than that of the original PWM driving signal; the LED light-emitting device can effectively reduce the flicker depth and improve the light-emitting efficiency of the LED.

Description

LED dimming method and display device
Technical Field
The application relates to the technical field of display, in particular to an LED dimming method and display equipment.
Background
The backlight source used on the television at present is an LED light source, and in order to obtain a good display effect and achieve the purposes of energy conservation and emission reduction, the working current of an LED is not fixed, and dimming treatment is needed by utilizing an LED dimming technology.
LED dimming techniques are classified into DC dimming and PWM dimming, and PWM dimming is typically selected for a larger dimming range and a more uniform color temperature profile to obtain better electrical performance. However, due to the PWM dimming characteristics, even at higher PWM frequencies, human eyes are injured by the inherent stroboscopic effect. In addition, the fixed peak current does not fully exert the light-emitting characteristic of the LED, and the light-emitting efficiency of the LED is reduced.
Disclosure of Invention
The invention aims to provide an LED dimming method and display equipment, which can effectively reduce the flicker depth and improve the luminous efficiency of an LED.
In order to achieve the above purpose, the present application adopts the following technical scheme:
the embodiment of the application provides an LED dimming method, which comprises the following steps:
acquiring original PWM count data in an original PWM driving signal, wherein the original PWM count data comprises z-bit data;
acquiring target peak current data, target PWM count data and target PWM period data according to the original PWM count data, wherein the target peak current data is smaller than the original peak current data of the original PWM drive signal; the target peak current data comprises x-bit data, the target PWM count data comprises y-bit data, the target PWM cycle data comprises y which is a data value, x, y and z are positive integers which are larger than 1, and x and y are smaller than z;
and generating a target PWM driving signal according to the target peak current data, the target PWM count data and the target PWM period data, wherein the duty ratio of the PWM driving signal is larger than that of the original PWM driving signal.
In some embodiments, the LED dimming method has a ratio of the target peak current data to the original peak current data that is approximately the same as the duty cycle of the original PWM driving signal.
In some embodiments, the driving current of the original PWM driving signal is substantially the same as the driving current of the target PWM driving signal.
In some embodiments, the LED dimming method further comprises the steps of:
acquiring high x-bit data in original PWM count data;
when the high-x data are all the first target data values, the high-x data are used as target peak current data;
when the high-x data is not the first target data value, the new high-x data obtained by adding 1 to the high-x data is used as the target peak current data.
Bit data in some embodiments the LED dimming method, the step of obtaining target PWM count data from the original PWM count data comprises:
the original PWM count data is shifted right by (z-y) data bits and then the data bits of the upper (z-y) bits are zero-padded to obtain target PWM count data comprising y bits of data.
In some embodiments, the LED dimming method includes the steps of obtaining target PWM period data from the raw PWM count data, including:
acquiring high x-bit data in original PWM count data;
when the high-x data are all the first target data values, the high-x data in the original PWM count data are taken out, and the low (y-x) data are all set as the first target data values, so that target PWM cycle data comprising y-bit data are obtained; wherein y is greater than x;
when the data value corresponding to each data bit in the high-x data is not the first target data value, taking out the high-x data in the original PWM count data, adding 1, and setting the low (y-x) data as the second target data value to obtain target PWM cycle data comprising y-bit data, wherein y is larger than x.
In some embodiments, the LED dimming method includes the steps of obtaining target PWM count data from original PWM count data, including:
acquiring high x-bit data in original PWM count data;
when the high-order data are all the first target data values, setting the low (z-x) order data in the original PWM count data as the first target data values so as to obtain middle period data comprising z order data;
acquiring intermediate duty cycle data according to the intermediate period data and the original PWM count data;
and acquiring target PWM count data according to the data bits of the intermediate duty ratio data and the target PWM count data.
The LED dimming method in some embodiments further comprises, after the step of obtaining the high x-bit data in the original PWM count data:
when the high-order data is not the first target data value, the high-order data in the original PWM count data is added with 1, and the low (z-x) order data in the original PWM count data is set to the second target data value, so as to obtain the middle period data including the z-order data.
In some embodiments, the LED dimming method includes the steps of obtaining target PWM period data according to an original PWM driving signal, including:
acquiring target PWM count data according to an original PWM driving signal;
and the PWM cycle data is targeted according to the targeted PWM count data.
The embodiment of the application also provides display equipment, which comprises a control module and a display module, wherein the control module is connected with the display module, and the display module comprises a plurality of LED lamps; the control module is used for executing the LED dimming method, and the LED lamps are displayed and lightened according to the target PWM driving signals output by the control module.
Compared with the prior art, the LED dimming method and the display device are provided, the LED dimming method is used for decomposing according to the original PWM count data of the original PWM drive signal to obtain the target PWM drive signal, the target peak current data comprises x-bit data, the target PWM count data comprises y-bit data, and the data bit of the target peak current data and the data bit of the target PWM count data are not larger than the data bit of the original PWM count data, so that the duty ratio of the PWM signal and the peak current of the PWM signal can be effectively improved under the condition that the brightness of an LED is unchanged, the stroboscopic effect is further reduced, and the luminous efficiency is improved.
Drawings
Fig. 1 is a flowchart of an LED dimming method provided in the present application.
Fig. 2 is a schematic diagram of PWM signals in the LED dimming method provided in the present application.
Fig. 3 is a schematic diagram of parameter indication of PWM signals in the LED dimming method provided in the present application.
Fig. 4 and fig. 5 are flowcharts of step 200 in the LED dimming method provided in the present application.
Detailed Description
In view of the shortcomings of the prior art, an object of the present application is to provide an LED dimming method and a display device, which can effectively reduce the flicker depth and improve the luminous efficiency of the LED.
In order to make the objects, technical solutions and effects of the present application clearer and more specific, the present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Referring to fig. 1, the method for dimming an LED provided in the present application includes the following steps:
100. acquiring original PWM count data in an original PWM driving signal, wherein the original PWM count data comprises z-bit data;
200. acquiring target peak current data, target PWM count data and target PWM period data according to the original PWM count data, wherein the target peak current data is smaller than the original peak current data of the original PWM drive signal; the target peak current data comprises x-bit data, the target PWM count data comprises y-bit data, the target PWM cycle data comprises y which is a data value, x, y and z are positive integers which are larger than 1, and x and y are smaller than z;
300. and generating a target PWM driving signal according to the target peak current data, the target PWM count data and the target PWM period data, wherein the duty ratio of the PWM driving signal is larger than that of the original PWM driving signal.
In the LED dimming method, the LEDs are driven to light through PWM signals, and the PWM signals are provided by a driving chip. As shown in fig. 2, when the human eye observes a scene, the light signal is transmitted to the brain nerve, a short period of time is required, and the visual image does not disappear immediately after the light is applied, so that the light and shade change is indicated by rapid light and shade alternation and the time ratio of light and shade adjustment. As shown in fig. 3, the PWM signal includes three parameter values, which are PWM period data, peak current data, and PWM count data, respectively; the PWM count data is used to represent a high level time in one PWM period data, that is, a bright area time of the PWM signal, the ratio of the PWM count data to the PWM period data is the duty ratio of the PWM signal, and the product of the duty ratio of the PWM signal and the peak current data is the driving current of the PWM signal, that is, the current for driving the LED to light, and the magnitude of the driving current is related to the brightness of the LED.
In specific implementation, in the LED dimming method, original PWM count data in an original PWM driving signal is obtained, wherein the original PWM count data is binary data and comprises z-bit data; and then, decomposing the original PWM count data in the original PWM driving signal so as to acquire target peak current data, target PWM count data and target PWM period data, wherein the target peak current data comprises x-bit data, the target PWM count data comprises y-bit data, and the target PWM period data comprises y as a data value. Wherein x, y and z are positive integers greater than 1, and x and y are less than z. And generating a target PWM driving signal according to the target peak current data and the target PWM count data, and driving the LED to light by the target PMW driving signal. In the target PWM driving signal obtained according to the original PWM count data of the original PWM driving signal, the peak current data in the target PWM driving signal is made smaller than the peak current data in the original PWM driving signal, and the PWM count data in the target PWM driving signal is greater than the PWM count data in the original PWM driving signal, so that the bright area time in the PWM signal can be increased and the peak current data in the PWM signal can be reduced, thereby achieving the purpose of reducing stroboscopic effect and improving the luminous efficiency.
In some embodiments, the target peak current data including x-bit data, the target peak current data including y-bit data, and the target PWM count data are obtained by decomposing an original PWM driving signal including z-bit data, and the target peak current data is greater than the original target current data, and the duty cycle of the target PWM driving signal is greater than the duty cycle of the original PWM driving signal, so that the ratio of the target peak current data to the original peak current data is substantially the same as the duty cycle of the original PWM driving signal.
In some embodiments, the driving current of the PWM driving signal is the achievement of the duty ratio and the peak current data of the PWM driving signal, and increasing the duty ratio of the PWM driving signal reduces the peak current data, so that the driving current of the original PWM driving signal is approximately the same as the driving current of the target PWM driving signal, and when the driving current of the original PWM driving signal and the driving current of the target PWM driving signal are approximately the same, that is, it is indicated that the parameters of the PMW driving signal are changed while the brightness of the LED lamp can be ensured to be kept unchanged, so that the LED dimming method in the present application can effectively reduce the flicker depth and improve the luminous efficiency of the LED without changing the brightness of the LED.
In some embodiments, referring to fig. 4, the step of obtaining the target peak current data from the raw PWM count data comprises:
210. acquiring high x-bit data in original PWM count data;
220. when the high-x data are all the first target data values, the high-x data are used as target peak current data; when the high-x data is not the first target data value, the new high-x data obtained by adding 1 to the high-x data is used as the target peak current data.
In this embodiment, after the original PWM count data is obtained, it is determined whether the high x-bit data in the original PWM count data are all the first target data values. For example, if the first target data value is 1, then it needs to determine whether all the original PWM count data are 1, if yes, then directly fetching the high x-bit data to obtain the target peak current data including the x-bit data; if not, the high x-bit data is added with 1 to obtain new x-bit data, for example, if x is 6, the high x-bit data is 111100, the high x-bit data is added with 1 to obtain new data 111101, and the new data 111101 including 6-bit data is taken as target peak current data.
As one embodiment, the step of acquiring the target PWM period data from the raw PWM count data comprises: when the high-x data are all the first target data values, the high-x data in the original PWM count data are taken out, and the low (y-x) data are all set as the first target data values, so that target PWM cycle data comprising y-bit data are obtained; wherein y is greater than x.
Likewise, after the PWM count data is obtained in this embodiment, different methods are adopted to obtain target PWM period data according to whether the high-x bit data is the first target data value, if the high-x bit data is the first target data value, the low (y-x) bit data in the original PWM count data is set to the first target data value, so as to obtain target PWM period data including y-bit data; if the data value corresponding to each data bit in the high-order data is not the first target data value, adding 1 to the high-order data in the original PWM count data, and setting the low (y-x) data in the original PWM count data as the second target data value to obtain target PWM cycle data comprising y-order data, wherein the second target data can be 0. For example, the original PWM count data is 111100111111, the upper 6 bits are 111100, the upper 6 bits are added 1 to 111101, and the target PWM period data obtained by adding all the lower 4 bits to 0 is 1111010000. The data bits of the target PWM period data in this embodiment are the same as the data bits of the target PWM count data, and all include y-bit data.
When the PWM period of the PWM signal is adjustable, the step of obtaining the target PWM count data from the original PWM count data includes: the original PWM count data is shifted right by (z-y) data bits and then the data bits of the upper (z-y) bits are zero-padded to obtain target PWM count data comprising y bits of data. For example, if z is 12, x is 6, y is 10, the original PWM count data is 111110111110, the original PWM count data is shifted to the right by 2 bits and zero padding is performed on the upper 2 bits to obtain 001111101111, and the upper 2 bits zero padding can be omitted to obtain the target PWM period data 1111101111 including 10 data bits.
In some embodiments, if the PWM period of the PWM signal is not adjustable, the step of obtaining the target peak current data according to the original PWM count data is identical to the step of obtaining the target peak current data when the PWM period is adjustable, that is, it is also determined whether the high x-bit data in the original PWM count data are both the first target value, if yes, the high x-bit data are directly taken as the target peak current data, if not, the high x-bit data are taken and added with 1 to obtain new data, and the new data are taken as the target peak current data.
In some embodiments, referring to fig. 5, the step of obtaining the target PWM count data from the original PWM count data includes:
201. acquiring high x-bit data in original PWM count data;
202. when the high-order data are all the first target data values, setting the low (z-x) order data in the original PWM count data as the first target data values so as to obtain middle period data comprising z order data;
203. acquiring intermediate duty cycle data according to the intermediate period data and the original PWM count data;
204. and acquiring target PWM count data according to the data bits of the intermediate duty ratio data and the target PWM count data.
In this embodiment, after the original PWM count data is obtained, it is determined whether the high-x bit data of the original PWM count data are all the first target data values, if yes, the low (z-x) bit data in the original PWM count data are all set to the first target data values, so as to obtain intermediate period data including z bit data; then taking the ratio of the original PWM count data to the intermediate period data as intermediate duty ratio data, and obtaining target PWM count data according to the data bits of the intermediate duty ratio data and the target PWM count data, for example, the data bit y of the target PWM count data is 8, multiplying the intermediate duty ratio data by (2 8 And 1) obtaining data after rounding, namely target PWM count data.
And when the high-order data is not the first target data value, adding 1 to the high-order data in the original PWM count data, and setting the low (z-x) order data in the original PWM count data as the second target data value to obtain the middle period data comprising z-order data. The second target data value in this embodiment is 0. For example, the original PWM count data is 111100111111, the upper 6-bit data is 111100, the upper 6-bit data is added to 1 to obtain 111101, and the middle period data obtained by adding all the lower 6-bit data to 0 is 111101000000. And obtaining intermediate duty ratio data according to the intermediate period data and the original PWM count data, and obtaining target PWM count data according to the duty ratio data and the data bits of the target PMW count data.
Specifically, if the PWM period of the PWM driving signal is not adjustable, when the target PWM count data of the y-bit data is obtained at this time, the target PWM period data corresponding to the corresponding target PMW count data is fixed, that is, the step of obtaining the target PWM period data according to the original PWM driving signal at this time includes:
211. acquiring target PWM count data according to an original PWM driving signal;
212. and the PWM cycle data is targeted according to the targeted PWM count data.
Specifically, if the data bit of the target PWM count data is y, the decimal data corresponding to the target PWM period data of the target PWM count data is 2 y Therefore, for the situation that the PWM period is not adjustable, when the number of bits of the target PWM count data is determined, the corresponding target PWM period data is fixed, and the target PWM period data can be calculated directly according to the target PWM count data.
In order to facilitate understanding of the dimming process of the LED dimming method in the present application, the following specific embodiments describe the LED dimming method in detail:
PWM drive signal adjustable for PWM period:
acquiring original PWM count data comprising z-bit data, judging whether high-x-bit data of the original PWM count data are 1, if yes, acquiring the high-x-bit data, and fully setting low (y-x) bit data to 1 to obtain target PWM cycle data comprising y-bit data; at the same time, the high x-bit data is taken as target peak current data. If the high-order data of the original PWM count data is not full bit 1, taking the high-order data and adding 1, and then, setting all low (y-x) data to 0 to obtain target PWM cycle data comprising y-order data, and at the same time, taking the x-order data obtained by adding 1 to the high-order data as target peak current data. And the original PWM count data is shifted right by (z-y) bits, and the high (z-y) bits are complemented by 0 to obtain target PWM count data comprising y bits of data.
For example: if z is 12, x is 6, y is 10, the original PWM count data including 12 bits of data is decomposed into target peak current data including 6 bits of dataAnd target PWM count data comprising 10-bit data. If the original PWM count data of the original PWM driving signal is 101110111110 =3006, the original PWM period data of the original PWM driving signal is 2 12 =4096, the original peak current data of the original PWM driving signal is 2 6 =64, then the duty cycle of the original PWM drive signal=3006/4096=73%, and the drive current of the corresponding original PWM drive signal is 64×73% =47.
Since the high 6-bit data of the original PWM count data are not all 1, the high 6-bit data are taken out as target peak current data after being added with 1, namely 101111=46; similarly, since the upper 6 bits of the original PWM count data are not all 1, the upper 6 bits of the data are taken out and then added with 1 to obtain new data, and the lower 4 bits of the new data are all added with 0 to obtain the target PWM period data, namely 1011110000 =752; the original PWM count data is shifted to the right by 2 data bits and the data bit of the upper 2 bits is zero-padded to obtain target PWM count data, namely 1011101111 =751, then three parameters corresponding to the target PWM drive signal are target peak current data, target PWM count data and target PWM period data respectively, namely the duty ratio=1007/1008=99.9% of the adjusted target PWM drive signal, the target peak current data is 46, the drive current of the corresponding target PWM drive signal is 46×99.9% =46, and the ratio of the target peak current data to the original peak current data is 46/64=72%.
In comparison, the duty ratio of the target PWM driving signal is greater than the duty ratio of the original PWM driving signal, and the peak current data of the target PWM driving signal is smaller than the peak current of the original PWM driving signal, wherein the ratio of the target peak current data to the original peak current data is substantially the same as the duty ratio of the original PWM driving signal, and at the same time, the driving circuit of the target PWM driving signal is almost the same as the driving current of the original PWM driving signal. When the driving current of the LED does not change, the brightness of the corresponding LED does not change. From this, decompose in this application according to original PWM count data of original PWM drive signal in order to obtain target PWM drive signal, under the unchangeable circumstances of assurance LED luminance, can effectively improve the duty cycle of PWM signal and reduce the peak current of PWM signal, and then reduce the stroboscopic to improve luminous efficacy.
PWM drive signals that are not adjustable for PWM periods:
acquiring original PWM count data comprising z-bit data, judging whether high-x-bit data of the original PWM count data are all 1, if so, setting low (z-x) bit data in the original PWM count data to be 1 so as to obtain middle period data comprising z-bit data; if the high-x bit data of the original PWM count data is not full bit 1, adding 1 to the high-x bit data in the original PWM count data, and setting the low (z-x) bit data in the original PWM count data to 0 so as to obtain middle period data comprising z bit data. And then, acquiring intermediate duty ratio data according to the intermediate period data and the original PWM count data, and acquiring target PWM count data according to the intermediate duty ratio data and the data bits of the target PWM count data.
Meanwhile, if the high x-bit data of the original PWM count data are all 1, the high x-bit data are taken as target peak current data. And if the high-order data of the original PWM count data is not full of 1 bit, taking out the high-order data and taking the obtained high-order data after adding 1 bit as target peak current data.
For example: if z is 12, x is 8, and y is 8, the original PWM count data including 12-bit data is decomposed into target peak current data including 8-bit data and target PWM count data including 8-bit data. If the original PWM count data of the original PWM driving signal is 101100111111 =2879, the original PWM period data 2 12 =4096, peak current of original PWM driving signal is 2 8 256, the duty cycle of the original PWM drive signal is 2879/4096=70.3%, and the drive current of the original PWM drive signal is 256×70.3+=180.
Since the upper 8-bit data of the original PWM count data is not all 1, the target peak current data obtained by adding 1 to the upper 8-bit data is 10110110 =182. Similarly, since the upper 8 bits of the original PWM count data are not all 1, the upper 8 bits of the data are taken out and then added with 1 to obtain new data, and the lower 4 bits of the new data are all added with 0 to obtain intermediate period data, namely 101101100000 =2912; based on intermediate period data and raw PWM count dataCalculating intermediate duty cycle data=2879/2912=98.9%; if it is desired to obtain target PMW count data including 8 bits of data, 98.9%, (2 8 -1) =252.2, and the target PWM count data obtained by rounding 252.2 is 253, and the PWM count period corresponding to the PWM count data of 8 bits of data bits is 2 because the PWM period of the PWM driving signal in this embodiment is not adjustable 8 256, thus, the duty cycle of the target PWM drive signal is 253/256=98.8%, the drive current of the target PWM drive signal is 98.8% ×182=180, and the ratio of the target peak current data to the original peak current data is 182/256=71%.
Also, as can be seen from comparison, the duty ratio of the target PWM driving signal is greater than the duty ratio of the original PWM driving signal, and the peak current data of the target PWM driving signal is smaller than the peak current of the original PWM driving signal, wherein the ratio of the target peak current data to the original peak current data is substantially the same as the duty ratio of the original PWM driving signal, and at the same time, the driving current of the driving circuit of the target PWM driving signal is almost the same as the driving current of the original PWM driving signal. When the driving current of the LED does not change, the brightness of the corresponding LED does not change. From this, decompose in this application according to original PWM count data of original PWM drive signal in order to obtain target PWM drive signal, under the unchangeable circumstances of assurance LED luminance, can effectively improve the duty cycle of PWM signal and reduce the peak current of PWM signal, and then reduce the stroboscopic to improve luminous efficacy.
The embodiment of the application also provides display equipment, wherein the display equipment comprises a control module and a display module, the control module is connected with the display module, and the display module comprises a plurality of LED lamps; the control module is configured to execute the above-mentioned LED dimming method, and since the above-mentioned LED dimming method is described in detail, the details are not repeated here.
In some embodiments, the control module includes a controller and a driving chip, the controller obtains original PWM count data in the original PWM driving signal, and obtains target peak current data and target PWM count data according to the original PWM count data; wherein the original PWM count data comprises z-bit data; the target peak current data comprises x-bit data, the target PWM count data comprises y-bit data, x, y and z are positive integers greater than 1, and x and y are smaller than z; and then, the controller controls the driving chip to output a target PWM driving signal to the display module according to the target peak current data and the target PWM counting data so as to drive the LED lamp in the display module to be lighted.
In summary, according to the LED dimming method and the display device provided by the present application, the original PWM count data in the original PWM driving signal is obtained, where the original PWM count data includes z-bit data; acquiring target peak current data, target PWM count data and target PWM period data according to the original PWM count data, wherein the target peak current data is smaller than the original peak current data of the original PWM drive signal; the target peak current data comprises x-bit data, the target PWM count data comprises y-bit data, the target PWM period data comprises y-bit data, x, y and z are positive integers greater than 1, and x and y are smaller than z; generating a target PWM driving signal according to the target peak current data, the target PWM count data and the target PWM period data, wherein the duty ratio of the PWM driving signal is larger than that of the original PWM driving signal; the LED light-emitting device can effectively reduce the flicker depth and improve the light-emitting efficiency of the LED.
It will be understood that equivalents and modifications will occur to persons skilled in the art and may be made in accordance with the present invention and its application and spirit, and all such modifications and substitutions are intended to be included within the scope of the following claims.

Claims (10)

1. An LED dimming method, comprising the steps of:
acquiring original PWM count data in an original PWM driving signal, wherein the original PWM count data comprises z-bit data;
acquiring target peak current data, target PWM count data and target PWM period data according to the original PWM count data, wherein the target peak current data is smaller than the original peak current data of the original PWM driving signal; the target peak current data comprises x-bit data, the target PWM count data comprises y-bit data, the target PWM cycle data comprises y-bit data, x, y and z are positive integers greater than 1, and x and y are smaller than z;
generating a target PWM driving signal according to the target peak current data, the target PWM count data and the target PWM period data, wherein the duty ratio of the PWM driving signal is larger than that of the original PWM driving signal.
2. The LED dimming method of claim 1, wherein the ratio of the target peak current data to the original peak current data is approximately the same as the duty cycle of the original PWM drive signal.
3. The LED dimming method of claim 1, wherein the drive current of the original PWM drive signal is substantially the same as the drive current of the target PWM drive signal.
4. A method of dimming an LED as claimed in claim 2 or 3, wherein the step of obtaining target peak current data from the raw PWM count data comprises:
acquiring high x bit data in the original PWM count data;
when the high-x data are all the first target data values, the high-x data are used as the target peak current data;
and when the high-x bit data is not the first target data value, taking new x bit data obtained by adding 1 to the high-x bit data as the target peak current data.
5. The LED dimming method of claim 4, wherein the step of obtaining target PWM count data from the raw PWM count data comprises:
right shifting (z-y) the original PWM count data by data bits followed by zero padding of data bits of higher (z-y) bits to obtain the target PWM count data comprising y bits of data.
6. The LED dimming method of claim 5, wherein the step of obtaining target PWM period data from the raw PWM count data comprises:
acquiring high x bit data in the original PWM count data;
when the high-x data are all the first target data values, the high-x data in the original PWM count data are taken out, and the low (y-x) data are all set as the first target data values, so that the target PWM cycle data comprising y-bit data are obtained;
when the data value corresponding to each data bit in the high-x data is not the first target data value, taking out the high-x data in the original PWM count data, adding 1, and setting the low (y-x) data as the second target data value to obtain the target PWM cycle data comprising y-bit data, wherein y is larger than x.
7. A method of dimming an LED as claimed in claim 2 or 3, wherein the step of obtaining target PWM count data from the raw PWM count data comprises:
acquiring high x bit data in the original PWM count data;
when the high-x-bit data are all first target data values, setting low (z-x) bit data in the original PWM count data as the first target data values so as to obtain middle period data comprising z-bit data;
acquiring intermediate duty cycle data according to the intermediate period data and the original PWM count data;
and acquiring the target PWM count data according to the data bits of the intermediate duty ratio data and the target PWM count data.
8. The LED dimming method of claim 7, wherein the step of obtaining the high x-bit data in the raw PWM count data further comprises:
when the high-order data is not the first target data value, adding 1 to the high-order data in the original PWM count data, and setting the low (z-x) order data in the original PWM count data to a second target data value to obtain middle period data including z-order data.
9. The LED dimming method of claim 8, wherein the step of obtaining the target PWM period data from the original PWM drive signal comprises:
acquiring the target PWM count data according to the original PWM driving signal;
and the target PWM cycle data is according to the target PWM count data.
10. The display device is characterized by comprising a control module and a display module, wherein the control module is connected with the display module, and the display module comprises a plurality of LED lamps; the control module is used for executing the LED dimming method according to any one of claims 1-9, and a plurality of LED lamps are displayed and lightened according to the target PWM driving signals output by the control module.
CN202310380500.1A 2023-04-10 2023-04-10 LED dimming method and display device Pending CN117409706A (en)

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CN202310380500.1A CN117409706A (en) 2023-04-10 2023-04-10 LED dimming method and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310380500.1A CN117409706A (en) 2023-04-10 2023-04-10 LED dimming method and display device

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CN117409706A true CN117409706A (en) 2024-01-16

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