CN113763876B - Dynamic energy-saving starting method for LED driving chip - Google Patents
Dynamic energy-saving starting method for LED driving chip Download PDFInfo
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- CN113763876B CN113763876B CN202111216839.5A CN202111216839A CN113763876B CN 113763876 B CN113763876 B CN 113763876B CN 202111216839 A CN202111216839 A CN 202111216839A CN 113763876 B CN113763876 B CN 113763876B
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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]
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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Abstract
The invention discloses a dynamic energy-saving starting method of an LED driving chip, which belongs to the field of LED display, and is characterized in that when a frame changing signal vsync comes, gray data written into an SRAM cache data _ buf before the LED driving chip is judged: if the gray data written into the SRAM cache data _ buf in two continuous frames are constantly 0 and the LED driving chip does not enter the energy-saving mode, pulling up an energy-saving enabling signal by the LED driving chip on the rising edge of the first dclk after the third frame conversion signal vsync, namely entering the energy-saving mode; if the energy-saving mode is entered, the energy-saving enabling signal is high, and when the gray data written into the SRAM cache data _ buf is not 0, the LED driving chip immediately pulls down the energy-saving enabling signal on the next rising edge of dclk, that is, exits the energy-saving mode. The invention can reduce the power consumption of the LED driving chip under the condition of obtaining the same display effect, effectively reduce the power consumption of the whole LED display screen body, prolong the service life of the screen body and reduce the cost.
Description
Technical Field
The invention relates to the technical field of LED display, in particular to a dynamic energy-saving starting method for an LED driving chip.
Background
In recent years, with the continuous and deep research on semiconductor luminescent materials, the continuous progress of LED manufacturing processes, and the development and application of new materials, ultra-high brightness LEDs of various colors have made breakthrough progress. These have LED to the increasingly widespread use of LEDs, mainly in three categories: (1) high-power lighting lamps such as street lamps and automobile lamps; (2) Indoor decorative lamps, automobile interior lighting and other middle and small power lamps; (3) Backlight sources for portable electronic products such as mobile phones, MP4 and portable computers. High integration, small size and low power consumption are the main development directions.
With the increasing of the area and the pixel density of the LED display screen, the power consumption problem of the LED display screen becomes more and more obvious, and the energy-saving and environment-friendly LED display screen becomes the first choice of customers. The LED display screen body mainly comprises a plurality of display modules, wherein the LED display screen body occupies the larger energy consumption of the display modules and is the energy consumption of the LED driving chip. Therefore, on the premise of ensuring the LED display effect, the use of low-power-consumption LED driving chips is becoming the mainstream of the industry.
Disclosure of Invention
The invention aims to provide a dynamic energy-saving starting method of an LED driving chip, which aims to solve the problems in the background technology.
In order to solve the technical problem, the invention provides a dynamic energy-saving starting method of an LED driving chip, which comprises the following steps of judging gray data written into an SRAM cache data _ buf before the LED driving chip when a frame changing signal vsync comes:
if the gray data written into the SRAM cache data _ buf in two continuous frames are constantly 0 and the LED driving chip does not enter the energy-saving mode, pulling up an energy-saving enabling signal by the LED driving chip on the rising edge of the first dclk after the third frame conversion signal vsync, namely entering the energy-saving mode;
if the energy-saving mode is entered, the energy-saving enabling signal is high, and when the gray data written into the SRAM cache data _ buf is not 0, the LED driving chip immediately pulls down the energy-saving enabling signal on the next rising edge of dclk, that is, exits the energy-saving mode.
Optionally, the LED driving chip uses dclk as a clock for writing gray data, and uses vsync as a frame change signal; the width of the framing signal vsync is 3 rising edges of dclk.
Optionally, the data _ zero signal is defined to determine gray scale data written into the SRAM cache data _ buf of the LED driver chip, an initial value after power-on is 0, when the frame conversion signal vsync comes, the data _ zero signal is pulled high on a first dclk rising edge after the frame conversion signal vsync, then it is determined whether the gray scale data written into the SRAM cache data _ buf is 0 on each dclk rising edge, and if the gray scale data remains 0, the data _ zero signal remains unchanged.
Optionally, the frame _ data _ zero signal is defined to determine that data of a frame in the SRAM buffer data _ buf of the LED driver chip is written, an initial value after power-on is 0, when a rising edge of dclk after a first frame conversion signal vsync after the data _ zero signal is pulled high, then the gray data written in the SRAM buffer data _ buf is determined at each rising edge of dclk, and if the gray data is kept to be 0, the frame _ data _ zero signal is kept unchanged.
The invention provides a dynamic energy-saving starting method of an LED driving chip, which judges whether gray data of SRAM cache data _ buf is written before the LED driving chip when a frame changing signal vsync comes: if the gray data written into the SRAM cache data _ buf in two continuous frames are constantly 0 and the LED driving chip does not enter the energy-saving mode, pulling up an energy-saving enabling signal by the LED driving chip on the rising edge of the first dclk after the third frame conversion signal vsync, namely entering the energy-saving mode; if the energy-saving mode is entered, the energy-saving enabling signal is high, and when the gray data written into the SRAM cache data _ buf is not 0, the LED driving chip immediately pulls down the energy-saving enabling signal on the next rising edge of dclk, that is, exits the energy-saving mode.
The invention has the following beneficial effects:
(1) Under the condition of obtaining the same display effect, the power consumption of the LED driving chip is reduced;
(2) The power consumption of the whole LED display screen body is effectively reduced, the service life of the screen body is prolonged, and the cost is reduced.
Drawings
FIG. 1 is a timing diagram of an LED driver chip entering a dynamic power saving mode;
fig. 2 is a timing diagram of the LED driving chip exiting the dynamic power saving mode.
Detailed Description
The following describes the dynamic energy-saving turn-on method of the LED driving chip according to the present invention in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Example one
The invention provides a dynamic energy-saving starting method of an LED driving chip, which is characterized in that when a frame changing signal vsync comes, the gray data written into an SRAM cache data _ buf before the LED driving chip is judged:
if the gray data written into the SRAM cache data _ buf in two continuous frames are constantly 0 and the LED driving chip does not enter the energy-saving mode, pulling up an energy-saving enabling signal by the LED driving chip on the rising edge of the first dclk after the third frame conversion signal vsync, namely entering the energy-saving mode;
if the power saving mode is entered, the power saving enable signal is high, and when the gray scale data written into the SRAM cache data _ buf is not 0, the LED driving chip immediately pulls down on the next dclk rising edge, that is, exits the power saving mode, where the "next dclk" referred to above is the first dclk coming after the SRAM cache data _ buf writes the non-0 gray scale data.
The LED driving chip adopts dclk as a clock for writing gray data, vsync is used as a frame changing signal (the width is 3 rising edges of the dclk), and an internal digital part of the LED driving chip generates en _ low _ power which is used as an energy-saving enabling signal and is output to an analog part so as to close related modules of the analog part and reduce power consumption.
As shown in fig. 1, defining the data _ zero signal to determine the gray data written into the SRAM buffer data _ buf of the LED driver chip, where the initial value after power-on is 0, when the frame conversion signal vsync comes, the data _ zero signal is pulled high on the first dclk rising edge after the frame conversion signal vsync, and then it is determined whether the gray data written into the SRAM buffer data _ buf is 0 on each dclk rising edge, and if the gray data is kept as 0, the data _ zero signal remains unchanged.
Referring to fig. 1, defining a frame _ data _ zero signal to determine a frame of gray data written into the SRAM buffer data _ buf of the LED driver chip, where an initial value after power-up is 0, pulling up a first dclk rising edge after a first frame conversion signal vsync after the data _ zero signal is pulled up, then determining the gray data written into the SRAM buffer data _ buf at each dclk rising edge, and if the gray data remains to be 0, keeping the frame _ data _ zero signal unchanged.
As shown in fig. 1, the initial value of the power-saving enable signal en _ low _ power signal after being powered on is 0, the first dclk rising edge after the first frame conversion signal vsync after the frame _ data _ zero signal is pulled high, then the gray data written in the SRAM buffer data _ buf is determined at each dclk rising edge, and when the gray data in the data _ buf is not 0, the en _ low _ power signal is pulled low immediately after the first dclk rising edge of the gray data not being 0. Therefore, the energy-saving enable signal en _ low _ power can be ensured to be pulled high after the third frame-changing signal vsync only when two frames of all-0 data (namely two frames of gray data are all 0) are continuously written in the SRAM cache data _ buf of the LED drive chip, and at the moment, the LED drive chip enters an energy-saving mode. And then, judging the gray data written in the SRAM cache data _ buf at each rising edge of dclk, and if the gray data is kept to be 0, keeping the energy-saving enable signal en _ low _ power unchanged, namely keeping the LED driving chip in an energy-saving mode all the time.
As shown in fig. 2, when the gray data in the data _ buf is not 0, the data _ zero, frame _ data _ zero, en _ low _ power signals are simultaneously pulled low immediately after the first dclk rising edge after the gray data not 0, i.e. the LED driving chip exits the power saving mode.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (1)
1. A dynamic energy-saving starting method of an LED driving chip is characterized in that,
when the frame changing signal vsync comes, the gray data written into the SRAM cache data _ buf before the LED driving chip is judged:
if the gray data written into the SRAM cache data _ buf in two continuous frames are constantly 0 and the LED driving chip does not enter the energy-saving mode, pulling up an energy-saving enabling signal by the LED driving chip on the rising edge of the first dclk after the third frame conversion signal vsync, namely entering the energy-saving mode;
if the energy-saving mode is entered, the energy-saving enabling signal is high, and when the gray data written into the SRAM cache data _ buf is not 0, the LED driving chip is pulled down immediately along the energy-saving enabling signal at the next rising edge of dclk, namely, the LED driving chip exits the energy-saving mode;
the LED driving chip adopts dclk as a clock for writing gray data and vsync as a frame changing signal; the width of the framing signal vsync is 3 rising edges of dclk;
defining a data _ zero signal to judge gray data written into an SRAM cache data _ buf of the LED driving chip, wherein the initial value after electrification is 0, when a frame conversion signal vsync comes, pulling up the data _ zero signal at the first dclk rising edge after the frame conversion signal vsync, then judging whether the gray data written into the SRAM cache data _ buf is 0 at each dclk rising edge, and if the gray data is kept to be 0, keeping the data _ zero signal unchanged;
defining a frame _ data _ zero signal to judge one frame of data written into an SRAM cache data _ buf of the LED driving chip, wherein the initial value after power-on is 0, when the rising edge of dclk after a first frame conversion signal vsync after the data _ zero signal is pulled high, then judging gray data written into the SRAM cache data _ buf at each rising edge of dclk, and if the gray data is kept to be 0, keeping the frame _ data _ zero signal unchanged.
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| JP2009092745A (en) * | 2007-10-04 | 2009-04-30 | Ｎｅｃディスプレイソリューションズ株式会社 | Image display device and method of driving light source for the same |
| CN106933326B (en) * | 2017-03-10 | 2019-08-30 | Oppo广东移动通信有限公司 | A kind of method, device and mobile terminal of the Power Saving Class of dynamic regulation terminal |
| CN107633794B (en) * | 2017-11-13 | 2020-07-28 | 深圳市明微电子股份有限公司 | Energy-saving display system and method based on double-latch signal |
| CN107993611A (en) * | 2017-12-29 | 2018-05-04 | 深圳市明微电子股份有限公司 | Realize LED display drive circuit, chip and the display screen of automatic energy saving function |
| US11455766B2 (en) * | 2018-09-18 | 2022-09-27 | Advanced Micro Devices, Inc. | Variable precision computing system |
| CN110047424A (en) * | 2019-05-05 | 2019-07-23 | 吴达 | A kind of power-economizing method and energy-saving LED display screen of turntable driving LED screen |
| CN210052452U (en) * | 2019-06-27 | 2020-02-11 | 河北中炫晶瑞电子科技有限公司 | LED display screen with energy-saving function |
| CN111128071A (en) * | 2020-01-17 | 2020-05-08 | 深圳市富满电子集团股份有限公司 | LED display screen control method and chip |
| CN111836427A (en) * | 2020-08-17 | 2020-10-27 | 北京集创北方科技股份有限公司 | LED drive circuit, display device and display system |
| CN112951150B (en) * | 2021-01-29 | 2022-06-28 | 深圳市明微电子股份有限公司 | Energy-saving method, device and equipment for LED display screen and storage medium |
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