阅读说明：本技术 一种led驱动芯片动态节能开启方法 (Dynamic energy-saving starting method for LED driving chip ) 是由 夏云汉 王琪 范学仕 唐茂洁 于 2021-10-19 设计创作，主要内容包括：本发明公开一种LED驱动芯片动态节能开启方法,属于LED显示领域,在换帧信号vsync来到时判断LED驱动芯片之前写入SRAM缓存data-buf的灰度数据：如果连续两帧写入SRAM缓存data-buf中的灰度数据恒为0,且LED驱动芯片未进入节能模式,则LED驱动芯片在第三个换帧信号vsync后的第一个dclk上升沿,节能使能信号拉高,即进入节能模式；若已经进入节能模式,节能使能信号为高,当写入SRAM缓存data-buf中的灰度数据不为0时,LED驱动芯片在下一个dclk上升沿节能使能信号立刻拉低,即退出节能模式。本发明能够在获得同等显示效果的情况下,降低LED驱动芯片功耗,并且有效降低整个LED显示屏体的功耗,提高屏体使用寿命,降低成本。(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.)

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 immediately pulls down the energy-saving enabling signal on the next rising edge of dclk, that is, exits the energy-saving mode.

2. The dynamic energy-saving starting method of the LED driving chip as claimed in claim 1, wherein 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.

3. The dynamic energy-saving starting method of the LED driving chip as claimed in claim 1, wherein the data _ zero signal is defined to judge the gray data written into the SRAM buffer data _ buf of the LED driving chip, 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, then each dclk rising edge judges whether the gray data written into the SRAM buffer data _ buf is 0, if the gray data is kept as 0, the data _ zero signal is kept unchanged.

4. The dynamic energy-saving startup method for the LED driving chip according to claim 3, wherein the frame _ data _ zero signal is defined to determine a frame of data written into the SRAM buffer data _ buf of the LED driving chip, the initial value after power-on is 0, when the data _ zero signal is pulled high and the first dclk rising edge after the first frame conversion signal vsync is pulled high, then the gray data written into the SRAM buffer data _ buf is determined at each dclk rising edge, and if the gray data is kept as 0, the frame _ data _ zero signal is kept unchanged.

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 fixtures 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 laptop 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 a frame of data is written into the SRAM buffer data _ buf of the LED driver chip, an initial value after power-on is 0, when a first dclk rising edge after the data _ zero signal is pulled up and a first converted frame signal vsync is pulled up, then the gray data written into the SRAM buffer data _ buf is determined at each dclk rising edge, 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 dclk rising edge, 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.