CN115482798A - Low-frequency driving method and device for solving display refresh lag - Google Patents

Abstract

The invention discloses a low-frequency driving method and device for solving display refresh lag, comprising: a refresh signal controls a display drive unit to display data in a display RAM on a display screen; the refresh signal includes a preset low-frequency refresh signal and a display Refresh signal when RAM data is updated. In the present invention, by adding the display RAM data update detection function, after the display RAM data is updated, the display data refresh can be directly started at the first time without waiting for the next preset refresh to update the display, so as to ensure that the display RAM data can be displayed as soon as possible above the display. After the display screen is refreshed, it is still refreshed according to the original preset low-frequency refresh signal. The invention not only solves the problem of display hysteresis under low-frequency driving, but also ensures low power consumption of the display without affecting the requirement of low power consumption of the display.

Description

A low-frequency driving method and device for solving display refresh lag

technical field

The invention belongs to the technical field of screen display, and in particular relates to a low-frequency driving method and device for solving display refresh lag.

Background technique

In a smart terminal system, since the display screen is often used for display, the power consumption of the display screen generally accounts for more than half. In order to reduce the power consumption of the display screen, a variety of methods have been adopted, one of which is to use low-frequency drive to reduce the frame rate display scan drive frequency. Generally, low-frequency drive will make the frame frequency below 1HZ, sometimes in order to further reduce the display of the display screen. For power consumption, the frame rate will be set to 1/4HZ for display scan driving, or even lower. Taking 1/4HZ as an example, the display RAM data needs to be updated every 4 seconds and the display driver IC drives the display to refresh the display. If the RAM data is updated just after the display is refreshed, it will take nearly 4S to wait , the display driver IC can refresh the updated display content, and the display lags seriously, which affects the display effect.

Contents of the invention

The technical problem to be solved by the present invention is to provide a low-frequency driving method and device for solving display refresh lag, which solves the problem of display lag and does not greatly affect the requirement for low power consumption of the display.

In order to solve the problems referred to above, the technical scheme that the present invention takes is:

Provide a low-frequency driving method to solve display refresh lag, including:

The refresh signal controls the display drive unit to display the data in the display RAM on the display screen;

The refresh signal includes a preset low-frequency refresh signal and a refresh signal when displaying RAM data is updated.

Further, the refresh signal when the display RAM data is updated is sent by the detection module, and the detection module is used to detect whether the data in the display RAM is updated, and when the data in the display RAM is updated, a refresh signal is sent to the display drive unit for real-time Refresh, displaying the data in the display RAM on the display screen, when the data in the display RAM is not updated, the display drive unit refreshes according to the preset low-frequency refresh signal.

Preferably, when the data in the display RAM is updated, after the display drive unit is refreshed immediately, the time interval between the next refresh of the display drive unit and this instant refresh is equal to the refresh period of the preset low-frequency refresh signal, and then the refresh of the display drive unit Refresh according to the preset low-frequency refresh signal, that is, every instant refresh, the refresh cycle is reset and re-timed, and then the display drive unit still performs refresh according to the preset low-frequency refresh signal.

Preferably, after the immediate refresh of the display drive unit, the time interval between the next refresh of the display drive unit and the instant refresh is less than the refresh period of the preset low-frequency refresh signal, and then the refresh of the display drive unit is still refreshed according to the preset low-frequency refresh signal, that is During each instant refresh, the refresh period continues to count, and then the display drive unit still performs refresh according to the preset low-frequency refresh signal.

Further, the display RAM is integrated in a display driver IC, and the display driver IC has a built-in display RAM, and the display driver IC integrates a display driver unit.

Preferably, the preset low-frequency refresh signal is ≤1HZ.

The present invention also provides a low-frequency drive device for solving display refresh lag, including:

Display RAM for receiving display data;

The display refresh control module is used to output a refresh signal and control the refresh frequency of the display screen;

The detection module is used to detect whether the data in the display RAM is updated, and output a refresh signal when the data in the display RAM is updated;

The display drive unit is used to drive the display screen and display the data in the display RAM on the display screen;

Wherein, the display refresh control module outputs a preset low-frequency refresh signal to the display drive unit to control the display drive unit to work. When the detection module detects that the data in the display RAM is updated, it sends a refresh signal to the display drive unit to instantly refresh the display screen. Afterwards, the display drive unit continues to refresh according to the preset low-frequency refresh signal.

Further, the display RAM and the display driving unit are integrated in a display driving IC, and the display driving IC is bound on the display screen.

Further, the display driver IC is connected to the main control board through the FPC, and the main control board includes at least an MCU and a program memory, the program memory is used to store programs, and the MCU is at least used to communicate with the display driver IC and display the The image data is transferred to the display RAM of the display driver IC.

Preferably, the preset low-frequency refresh signal is ≤1HZ.

The beneficial effects produced by adopting the above-mentioned technical scheme are:

In the present invention, by adding the display RAM data update detection function, after the display RAM data is updated, the display data refresh can be directly started at the first time without waiting for the next preset refresh to update the display, so as to ensure that the display RAM data can be displayed as soon as possible above the display. After the display screen is refreshed, it is still refreshed according to the original preset low-frequency refresh signal. The invention not only solves the problem of display hysteresis under low-frequency driving, but also ensures low power consumption of the display without affecting the requirement of low power consumption of the display.

Description of drawings

Fig. 1 is a schematic diagram of the hardware structure of the low-frequency driving device of the present invention;

Fig. 2 is the flowchart of Embodiment 1 of the low-frequency driving method of the present invention;

Fig. 3 is the flowchart of Embodiment 2 of the low-frequency driving method of the present invention;

detailed description

The invention will be further described in detail below in conjunction with the accompanying drawings and based on the embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described, which will help those skilled in the art to understand the present invention Of course, those skilled in the art can fully understand the present invention without these detailed descriptions. In order to avoid confusion, the present invention does not describe in detail some known hardware, methods, processes, processes, etc.

Example 1

This embodiment provides a low-frequency driving method to solve display refresh lag. This method is based on the low-frequency refresh of the display screen, and adds a refresh when the display RAM data is updated, so that the updated display data is updated and displayed in time, and the problem of display lag is solved without changing the original low-frequency refresh frequency, thereby ensuring low-power display. consumption.

Figure 2 is a flow chart of the low-frequency driving method provided by Embodiment 1 of the present invention, and its specific steps are as follows:

Step S401, the display drive unit is refreshed according to a preset low-frequency refresh signal, and the display drive unit is controlled by the refresh signal to display the data in the display RAM on the display screen;

Step S402, detect and display the data in the RAM, and the detection is completed by the detection module;

Step S403, judging whether the data in the display RAM is updated, if so, execute step S403, otherwise execute step S401; this step is to judge the data update in the display RAM, and select to perform different steps according to the data update situation in the display RAM;

Step S404, the display drive unit refreshes immediately, this step is a follow-up execution step of the data update in the display RAM, that is, when the data in the display RAM is updated, a refresh signal is sent to the display drive unit for instant refresh, and the data in the RAM will be displayed displayed on the display;

Step S405, clearing the timing of this refresh cycle and restarting the timing. This step is to reset the preset low-frequency refresh cycle and restart the timing, so that the display drive unit will continue to refresh according to the preset low-frequency refresh signal.

In this embodiment, the refresh signal of the display drive unit has two sources, one is a preset low-frequency refresh signal, and the refresh signal is a preset fixed-frequency refresh signal, which can meet the requirements of displaying low power consumption; It is a refresh signal when displaying RAM data update. The refresh signal is a refresh signal added to the preset low-frequency refresh signal. The refresh signal is located in a certain refresh cycle of the preset low-frequency refresh signal, that is, the display drive unit The time interval between the next refresh and the instant refresh is less than the refresh period of the preset low-frequency refresh signal. The instant refresh can be one time, or two or more. The low-frequency refresh signal is used to refresh. When the data in the display RAM is updated, the display driver unit adds instant refresh to display the data in the display RAM on the display screen. The instant refresh will start the refresh cycle to clear, that is, every time the instant refresh , the refresh period is cleared and the timing is restarted, and the refresh is performed when the timing is up, that is, the display drive unit is still refreshed according to the preset low-frequency refresh signal.

Based on the existing display technology, the display RAM described in this embodiment is integrated in the display driver IC, which is a built-in display RAM of the display driver IC. Meanwhile, the display driver IC also integrates a display driver unit to facilitate external adaptation.

In order to ensure low power consumption of the display, the preset low-frequency refresh signal is ≤1HZ.

Example 2

Figure 3 is a flow chart of the low-frequency driving method provided by Embodiment 2 of the present invention, and its specific steps are as follows:

Step S501, the display drive unit refreshes according to a preset low-frequency refresh signal;

Step S502, detecting and displaying the data in the RAM;

Step S503, judging whether the data in the display RAM is updated, if so, execute step S503, otherwise execute step S501;

Step S504, the display drive unit refreshes immediately;

In step S505, the current refresh period continues to count.

The difference from Embodiment 1 is that in this embodiment, when the data in the display RAM is updated and timing refresh is performed, the refresh cycle is not cleared but continues to count, that is, the instant refresh does not affect the preset low-frequency refresh, and the display drive unit Immediate refresh is an additional refresh with high priority.

Fig. 1 shows the schematic diagram of the hardware structure of the above-mentioned embodiment of the present invention, referring to Fig. 1, the low-frequency driving device includes

display RAM 201 for receiving display data;

A display refresh control module 203, configured to output a refresh signal to control the refresh frequency of the display screen;

The detection module 202 is used to detect whether the data in the display RAM is updated, and output a refresh signal when the data in the display RAM is updated;

The display driving unit 204 is used to drive the display screen and display the data in the display RAM on the display screen;

Wherein, the display refresh control module outputs a preset low-frequency refresh signal to the display drive unit to control the display drive unit to work. When the detection module detects that the data in the display RAM is updated, it sends a refresh signal to the display drive unit to instantly refresh the display screen. Afterwards, the display drive unit continues to refresh according to the preset low-frequency refresh signal. While the detection module outputs the refresh signal, it sends a signal to the display refresh control module to control the refresh cycle. One is to clear the refresh cycle and restart timing, and the other is to continue timing. The judgment of updating the display RAM data belongs to the common sense of those skilled in the art, and will not be described in detail here.

In order to facilitate user use and control, and to adapt to more display devices, the display RAM and the display driving unit of the present invention are integrated in the display driving IC 200 , and the display driving IC is bound on the display screen 300 . The display driver IC is connected to the main control board 100 through the FPC, and the main control board includes at least an MCU and a program memory, the program memory is used to store programs, and the MCU is at least used to communicate with the display driver IC and display image data to be displayed. Transfer to the display RAM of the display driver IC.

In order to ensure the low power consumption requirement of the display, the preset low-frequency refresh signal is ≤1HZ.

Claims (10)

1. A low-frequency drive method for solving display refresh lag, characterized in that, comprising: The refresh signal controls the display drive unit to display the data in the display RAM on the display screen; The refresh signal includes a preset low-frequency refresh signal and a refresh signal when displaying RAM data is updated. 2. A kind of low-frequency drive method that solves display refresh lag according to claim 1, is characterized in that: the refresh signal when described display RAM data is updated is sent by detection module, and detection module is used for detecting whether the data in the display RAM Update, when the data in the display RAM is updated, a refresh signal is sent to the display drive unit for instant refresh, and the data in the display RAM is displayed on the display screen; when the data in the display RAM is not updated, the display drive unit presses the preset Refresh by setting a low-frequency refresh signal. 3. A kind of low-frequency drive method for solving display refresh lag according to claim 2, characterized in that: when the data in the display RAM is updated, after the display drive unit refreshes immediately, the next refresh of the display drive unit is the same as this time. The time interval of the instant refresh is equal to the refresh period of the preset low-frequency refresh signal, and then the refresh of the display driver unit is refreshed according to the preset low-frequency refresh signal, that is, every time the instant refresh is performed, the refresh period is reset and the timing is reset, and then the display drive unit is still Refresh according to the preset low-frequency refresh signal. 4. A low-frequency driving method for solving display refresh lag according to claim 2, characterized in that: after the real-time refresh of the display drive unit, the time interval between the next refresh of the display drive unit and the real-time refresh is less than the preset low-frequency refresh signal After that, the refresh of the display drive unit is still refreshed according to the preset low-frequency refresh signal, that is, the refresh cycle continues to be timed every time the instant refresh is performed, and then the display drive unit is still refreshed according to the preset low-frequency refresh signal. 5. A low-frequency driving method for solving display refresh lag according to any one of claims 1-4, wherein the display RAM is integrated in a display driver IC, and the display driver IC has a built-in display RAM, and the display RAM is integrated in the display driver IC. The display driver IC integrates the display driver unit. 6. A low-frequency driving method for solving display refresh lag according to claim 5, wherein the preset low-frequency refresh signal is ≤1HZ. 7. A low-frequency drive device for solving display refresh lag, comprising: Display RAM for receiving display data; The display refresh control module is used to output a refresh signal and control the refresh frequency of the display screen; The detection module is used to detect whether the data in the display RAM is updated, and output a refresh signal when the data in the display RAM is updated; The display drive unit is used to drive the display screen and display the data in the display RAM on the display screen; Wherein, the display refresh control module outputs a preset low-frequency refresh signal to the display drive unit to control the display drive unit to work. When the detection module detects that the data in the display RAM is updated, it sends a refresh signal to the display drive unit to instantly refresh the display screen. Afterwards, the display drive unit continues to refresh according to the preset low-frequency refresh signal. 8. A low-frequency drive device for solving display refresh lag according to claim 7, characterized in that: the display RAM and the display drive unit are integrated in a display drive IC, and the display drive IC is bound on the display screen . 9. A low-frequency drive device for solving display refresh lag according to claim 8, characterized in that: the display driver IC is connected to the main control board through the FPC, and the main control board at least includes an MCU and a program memory, and the program The memory is used to store programs, and the MCU is at least used to communicate with the display driver IC and transfer the image data to be displayed to the display RAM of the display driver IC. 10. A low-frequency drive device for solving display refresh lag according to any one of claims 7-9, characterized in that: the preset low-frequency refresh signal ≤ 1HZ.

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