TWI453728B - The control method of the display - Google Patents

Description

Display control method

The present invention relates to a control method for a display, and more particularly to a control method for a display for reducing power consumption of a display.

The current DVD player will play the main menu of the DVD disc after playing the movie, or the logo of the DVD player. In the foregoing case, the DVD player continuously outputs the same frame to the display, leaving the screen of the display in a stationary state. The display does not enter the power save mode because it continuously receives the signal from the DVD player. However, the display continuously displays the same picture, which tends to cause image sticking and wastes power. Therefore, how to develop a new display control method can enter the energy-saving mode after the screen is still for a while, which becomes the subject of further discussion in this case.

Accordingly, it is an object of the present invention to provide a control method for a display having energy saving and protection effects.

Therefore, the control method of the display of the present invention is applicable to a display, the display can be executed in an energy saving mode and a non-power saving mode, and the control method of the display in the non-power saving mode includes: (A) receiving a plurality of consecutive (B) when receiving each frame, the frame is divided into X sub-frames according to a preset principle, and the (N mod X) sub-frames are stored when receiving the Nth frame And the [[N-1) mod X] sub-frames, and compare the N-th frame The [[N-1) mod X] sub-frame and the [Nth] mod X sub-frame of the N-1th frame to generate a difference value, wherein X is defined as an integer greater than 1. , N is an integer greater than 1, and mod is the operation of dividing the two numbers by a remainder. When (N mod X) or [(N-1) mod X] is 0, the (N mod X) sub-frame or the first [ (N-1) mod X] sub-frames represent the Xth sub-frame; (C) sum the difference values corresponding to the X frames after receiving X frames; and (D) if step (C) When the calculated number of difference values is less than a predetermined threshold, the number of consecutive times reaches a preset number of times, and then enters the energy saving mode. Preferably, after the display enters the power saving mode, the following steps are performed: (E) receiving a plurality of consecutive frames; (F) when receiving each frame, dividing the frame into X according to the preset principle. a sub-frame, and store the (N mod X) sub-frames and the [(N-1) mod X] sub-frames when receiving the Nth frame, and compare the [Nth] of the Nth frame -1) mod X] sub-frames and the [Nth] mod X sub-frames of the N-1th frame to generate a difference value; (G) the X after each X frames are received The difference values corresponding to the frames are summed; and (H) if the sum of the difference values calculated in the step (G) is greater than the preset threshold, the non-energy saving mode is entered.

Preferably, when entering the energy saving mode, the display turns off a backlight of a display module or reduces the brightness of the backlight. Alternatively, the display turns off one of its speakers when entering the power save mode. or, Upon entering the power saving mode, a control unit of the display stops transmitting the video signal to a display module of the display.

The effect of the present invention is to determine whether or not to enter the energy saving mode by comparing the difference between the sub-frames of one of the same positions of each frame and the previous frame to determine whether the picture is still.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

1 and 2 are flow charts of a preferred embodiment of a method of controlling a display of the present invention. The preferred embodiment is suitable for execution on a display. The display can be implemented in an energy saving mode and a non-power saving mode. The non-energy saving mode is the normal operating mode. Entering the energy saving mode may be to turn off a backlight of a display module of the display, or to reduce the brightness of the backlight, or to turn off a speaker of the display, or a control unit of the display stops transmitting the video signal (such as an LVDS signal) ) to a display module of the display.

Before starting the flow of this embodiment, a plurality of initial control steps are explained below. First, a frame (ie, the first frame) is received, and the frame is divided into X sub-frames according to a preset principle, and the first sub-frame is stored, wherein X is defined as an integer greater than 1. Referring to FIG. 3, in the embodiment, the preset principle divides the frame into 25 sub-frames (ie, X=25), and the area of each sub-frame is the same. The number displayed in each sub-frame of FIG. 3 is the serial number of the corresponding sub-frame. For example, the number 1 indicates that the corresponding frame is the first sub-frame, and the number 2 indicates that the corresponding frame is the second sub-frame. ,So on and so forth. child The sub-frame is indicated by a slash in the frame. For example, the first sub-frame of FIG. 3 is indicated by a slash to indicate that the first sub-frame is stored. Of course, the value of X is not limited to this embodiment, and the area of each sub-frame may be different.

The flow steps of the preferred embodiment in the non-power saving mode of the display are described below with reference to FIG. First, as step S01, the parameter n=0 for counting is used, and the role of the parameter n will be described later. Next, as in step S02, a frame is received. Then, step S03 is executed, and the frame is divided into X sub-frames according to the preset principle. Let the frame be the Nth frame (defining N is an integer greater than 1), and then store the (N mod X) sub-frames and the [Nth] of the Nth frame as shown in step S04. -1) mod X] sub-frames. Where mod is defined as the operation of dividing the remainder by two numbers, and defining (N mod X) sub-frames or [[N-] when (N mod X) or [(N-1) mod X] is 0 1) mod X] sub-frames represent the Xth sub-frame. Next, as shown in step S05, the [[N-1) mod X] sub-frames of the Nth frame and the [(N-1) mod X] sub-frames of the N-1th frame are compared. To produce a difference value.

Steps S04 and S05 are described in more detail below with reference to FIG. 4. 4 shows the second frame received by the display. In step S04, the (2 mod 25) and the [(2-1) mod 25] sub-frames of the second frame are stored, that is, the second frame. The sub-frame and the first sub-frame are stored. In step S05, the [[2-1] mod 25] sub-frames of the second frame and the [(2-1) mod 25] sub-frames of the (2-1)th frame are compared. A difference value is generated, that is, the first sub-frame of the second frame and the first sub-frame of the first frame are compared to generate a difference value.

Then, as in step S06, it is determined whether X frames are received, and if yes, step S07 is performed, and if not, steps S02 to S05 are repeatedly executed until receiving Received X frames. More specifically, when receiving the second frame, since only one frame is received, the steps S02 to S05 are repeated: receiving the third frame (as shown in FIG. 5) and storing the third sub-frame. Frame and the second sub-frame, comparing the second sub-frame of the third frame with the second sub-frame of the second frame; receiving the fourth frame (as shown in Figure 6), storing its fourth Sub-frame and third sub-frame, compare the third sub-frame of the fourth frame with the third sub-frame of the third frame, and so on, receive and process the fifth frame to the 23rd After the frame, the 24th frame (Fig. 7), the 24th sub-frame and the 23rd sub-frame are stored, and the 23rd sub-frame and the 23rd frame of the 24th frame are compared. The 23rd sub-frame; then receive the 25th frame (Figure 8), store its 25th sub-frame and the 24th sub-frame, compare the 24th sub-frame of the 25th frame and the 24th The 24th sub-frame of the frame; then receive the 26th frame (as shown in Figure 9), store its first sub-frame and 25th sub-frame, compare the 25th sub-frame of the 26th frame with the 25th sub-frame of 25 framesSince 25 frames are received after receiving the 26th frame, step S07 will be executed next.

Step S07 is to add the difference values corresponding to the X frames. Next, in step S08, it is determined whether the sum of the difference values calculated in step S07 is less than a predetermined threshold. If yes, step S09 is performed. If not, step S01 is performed, that is, parameter n is reset to zero, and then the next step is received. Frame (as in the 27th frame of Figure 10). More specifically, step S08 determines whether the display screen is stationary. If the sum of the difference values is less than the preset threshold, the screen is stationary, or the change of the screen is negligible (for example, a change caused by noise). If the difference A sum of values not less than the preset threshold indicates that the picture has changed.

Step S09 adds 1 to the parameter n. Next, step S10 determines whether the value of the parameter n has reached a predetermined number of times m. If yes, step S11 is executed, the display enters the energy saving mode, and if not, step S02 is performed. More specifically, the parameter n is used to count the number of times the screen is continuously judged to be stationary. In this embodiment, the horizontal scanning frequency of the received frame is 60 Hz (3600 frames per minute, and the number of times the display compares the sum of the difference values with the preset threshold within 1 minute is 3600/25=144 times) The preset number of times m=144, the display will enter the energy-saving mode when the screen is still for 1 minute.

In the energy saving mode, the control method of this embodiment performs the process steps of FIG. 2. First, as in step S21, a frame is received. Next, in step S22, the frame is divided into X sub-frames according to the preset principle. Next, in step S23, the (N mod X) sub-frames and the [(N-1) mod X] sub-frames of the frame are stored. Step S24 is to compare the [(N-1) mod X] sub-frames of the Nth frame with the [(N-1) mod X] sub-frames of the N-1th frame to generate a difference value. . Next, it is determined in step S25 whether the display has received X frames, and if so, step S26 is performed, and if no, step S21 is performed. In step S26, the difference value corresponding to the X frames is added, and it is determined in step S27 whether the sum of the difference values calculated in step S26 is less than a predetermined threshold. If yes, step S21 is performed, and if not, step S28 is performed. From the energy saving mode, enter the non-energy saving mode. More specifically, step S27 is to determine whether the picture is in a state of maintaining a still state. If the sum of the difference values is smaller than the preset threshold, the picture is continuously stationary, so the display will repeat the steps S21 to S25 until the X pieces are received and processed. The frame is further executed in step S26. And step S27. If the sum of the difference values is not less than the preset threshold, indicating that the picture has changed, the display will leave the power saving mode and enter the non-power saving mode.

It is worth mentioning that, in this embodiment, in addition to being able to effectively distinguish whether the picture is still or not, it automatically enters or leaves the energy-saving mode. Since this embodiment stores only partial frames (ie, two sub-frames) for each frame, the entire image is not stored. The frame can therefore effectively save the memory usage of the display, thereby making the invention easy to implement.

In summary, the control method of the display of the present invention determines whether the picture is still by comparing the difference of the sub-frames, and can enter the automatic energy-saving mode after the picture is stationary for a period of time, thereby saving power consumption and avoiding image sticking. Further, since the memory of the present invention is used in a low amount, it is easy to implement industrially, and therefore the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

S01~S11‧‧‧ Process steps

S21~S28‧‧‧ Process steps

1 is a flow chart of a preferred embodiment of a control method for a display of the present invention, illustrating a flow of steps performed by the display in a non-power saving mode; FIG. 2 is another flow chart of the preferred embodiment, illustrating that the display is executed in a FIG. 3 is a schematic diagram of the first frame received by the preferred embodiment, illustrating the first sub-frame of the first frame stored in the preferred embodiment; FIG. 4 is the comparison A schematic diagram of the second frame received by the preferred embodiment, The preferred embodiment stores the second sub-frame and the first sub-frame of the second frame. FIG. 5 is a schematic diagram of the third frame received by the preferred embodiment, illustrating the preferred implementation. For example, the third sub-frame and the second sub-frame of the third frame are stored; FIG. 6 is a schematic diagram of the fourth frame received by the preferred embodiment, illustrating that the preferred embodiment stores the fourth 4th sub-frame and 3rd sub-frame of the frame; FIG. 7 is a schematic diagram of the 24th frame received by the preferred embodiment, illustrating the storage of the 24th frame by the preferred embodiment 24 sub-frame and 23rd sub-frame; FIG. 8 is a schematic diagram of the 25th frame received by the preferred embodiment, illustrating that the preferred embodiment stores the 25th sub-frame of the 25th frame and Figure 24 is a schematic diagram of the 26th frame received by the preferred embodiment, illustrating the first sub-frame and the 25th sub-frame of the 26th frame stored in the preferred embodiment And FIG. 10 is a schematic diagram of the 27th frame received by the preferred embodiment, illustrating the second sub-frame and the first sub-frame of the 27th frame stored in the preferred embodiment.

S01~S11‧‧‧ Process steps

Claims (4)

A display control method is suitable for execution on a display, the display can be executed in an energy-saving mode and a non-energy-saving mode, wherein the control method of the display comprises: (A) receiving a plurality of consecutive frames (B) When receiving each frame, the frame is divided into X sub-frames according to a preset principle, and the (N mod X) sub-frames and the first are stored when the Nth frame is received. (N-1) mod X] sub-frames, and compare the [(N-1) mod X] sub-frames of the Nth frame with the [(N-1) mod of the N-1th frame X] sub-frames to produce a difference value, where X is defined as an integer greater than 1, N is an integer greater than 1, and mod is the operation of dividing the remainder by two digits, when (N mod X) or [(N- 1) When mod X] is 0, the (N mod X) sub-frame or the [(N-1) mod X] sub-frame represents the X-th sub-frame; (C) each time X frames are received The difference values corresponding to the X frames are summed; and (D) if the sum of the difference values calculated in the step (C) is less than a predetermined threshold, the energy saving mode is entered; After the display enters the energy saving mode, it is executed. Step: (E) receiving a plurality of consecutive frames; (F) when receiving each frame, dividing the frame into X sub-frames according to the preset principle, and storing when receiving the Nth frame (N mod X) sub-frames and [[N-1) mod X] sub-frames, and compare The [[N-1) mod X] sub-frames of the N frames and the [(N-1) mod X] sub-frames of the N-1th frame to generate a difference value; (G) each After receiving the X frames, the difference values corresponding to the X frames are added together; and (H) if the sum of the difference values calculated in the step (G) is greater than the preset threshold, the non-energy saving mode is entered. The control method of the display of claim 1, wherein the display turns off a backlight of a display module or decreases the brightness of the backlight when entering the energy saving mode. The control method of the display according to claim 1, wherein the display turns off one of the speakers when entering the energy saving mode. The control method of the display according to claim 1, wherein a control unit of the display stops transmitting the video signal to a display module of the display when entering the energy saving mode.