TWI701647B - Picture display method, display device and information processing device capable of automatically adjusting frame rate - Google Patents

Abstract

A picture display method capable of automatically adjusting the frame rate is realized by driving a pixel array of a display screen through a control circuit. The method is characterized by including the following steps: using the control circuit to scan each frame of the display screen A variable blank period is inserted during the period or each scanning period to adjust the frame rate of the display screen. The variable blank period refers to the period during which the control circuit does not scan the pixel array.

Description

Picture display method, display device and information processing device capable of automatically adjusting frame rate

The present invention relates to a picture display method, in particular to a picture display method capable of automatically adjusting the frame rate.

The frame rate reduction methods adopted by existing displays mainly include clock frequency division and frame skipping. In terms of clock division, please refer to Table 1, which records the different frame rates corresponding to different clock frequencies; and Table 2, which records the different frame rates corresponding to different frame skip numbers.

Table 1 Clock frequency Frame rate f 60H _Z f/1.5 40H _Z f/2 30H _Z f/2.5 24H _Z f/3 20H _Z f/3.5 17H _Z

Table 2 Number of skipped frames Frame rate 0 60H _Z 1 30H _Z 2 20H _Z 3 15H _Z 4 12H _Z 5 10H _Z

However, the technical solution of clock frequency division has the disadvantage that only a limited frame rate can be selected; and the technical solution of frame skipping has the disadvantage that it may make the display screen appear flicker visible to the naked eye. Please refer to FIG. 1, which illustrates a schematic diagram of a conventional frame skipping technical solution. As shown in Figure 1, when the number of frame skips is 0, the frame rate is 60 _Hz ; and when the number of frame skips is 2, the frame rate is 20 _Hz . To conserve power when the display although the frame rate is 20 H _Z, however, in the case of a periodic frame skipping display screen presented, but it is highly likely to cause a viewer to see the flicker.

To solve the above problems, a novel display driving method is urgently needed in the art.

An object of the present invention is to provide a picture display method that can automatically adjust the frame rate, which can provide an adjustable frame rate by inserting a blank period during each frame scan period or each line scan period, thereby saving power consumption. Under the circumstances, maintain good picture display quality.

Another object of the present invention is to provide an image display method that can automatically adjust the frame rate, which can determine the frame rate by detecting the similarity of a plurality of consecutive frames to maintain a smooth image display effect while saving power.

Another object of the present invention is to provide a picture display method that can automatically adjust the frame rate, which can adjust the Gamma curve and/or the brightness value in the process of adjusting the frame rate to maintain good picture display quality.

In order to achieve the above objective, a picture display method that can automatically adjust the frame rate is proposed, which is realized by driving a pixel array of a display screen through a control circuit. The method is characterized by including the following steps:

The control circuit is used to insert a variable blank period during each frame scan period or each line scan period of the display screen to adjust the display frame rate of the display screen, wherein the variable blank period refers to the control circuit failure The period during which the pixel array is scanned.

In one embodiment, the position of the variable blank period in the scanning period of each frame or the scanning period of each row is fixed or randomly determined.

In one embodiment, the length of the variable blank period is determined by the number of frames of a plurality of consecutive frames that meet a similarity rule.

In a possible embodiment, the similarity rule means that the pixel data of the entire frame of the two consecutive frames are the same, or that the two consecutive frames have the same pixel data cyclic redundancy check code, or The control circuit did not monitor the screen data write command.

In a possible embodiment, the similarity rule means that the difference between the corresponding pixel data of the two consecutive frames does not exceed a threshold, or the difference between the corresponding pixel data of the two consecutive frames A cumulative value of the difference does not exceed a threshold, or the difference in the position of a center of gravity of a corresponding pixel data block of the two consecutive frames does not exceed a threshold, or the two consecutive frames are in the entire frame of pixel data The difference in the position of a center of gravity does not exceed a threshold.

In one embodiment, the image display method capable of automatically adjusting the frame rate further includes the following steps: using the control circuit to adaptively select a Gamma curve and/or a brightness value according to the variable blank period.

In one embodiment, the image display method capable of automatically adjusting the frame rate further includes the following steps: using the control circuit to enter the power-saving operation mode according to the variable blank period.

In one embodiment, the image display method capable of automatically adjusting the frame rate further includes the following steps: processing a charge pump clock signal with a signal shaping circuit in the control circuit to provide a stable charge pump output voltage.

In addition, the present invention further discloses a display device, which has the aforementioned control circuit and display screen, and the control circuit is used to execute the aforementioned image display method capable of automatically adjusting the frame rate.

In addition, the present invention further discloses an information processing device, which has a central processing unit and the aforementioned display device, wherein the central processing unit is used to communicate with the control circuit.

In possible embodiments, the information processing device can be a smart phone or a portable computer device.

In order to enable your reviewer to further understand the structure, features and purpose of the present invention, drawings and detailed descriptions of preferred specific embodiments are attached as follows.

Please refer to FIG. 2, which shows a flowchart of an embodiment of a picture display method capable of automatically adjusting the frame rate of the present invention, wherein the fingerprint sensing method is implemented by driving a pixel array of a display screen through a control circuit.

As shown in FIG. 2, the frame rate-adjustable picture display method includes the following steps: using the control circuit to insert a variable blank period during each frame scan period or each line scan period of the display screen to adjust the display screen The frame rate of the picture display, wherein the variable blank period refers to the period during which the control circuit does not scan the pixel array (step a); the control circuit is used to adaptively select a Gamma curve and/or a brightness value, and/or the control circuit enters the power-saving operation mode according to the variable blank period (step b); and a signal shaping circuit in the control circuit is used to process a charge pump clock signal So that a charge pump circuit provides a stable charge pump output voltage (step c).

In step a, the position of the variable blank period in the scanning period of each frame or the scanning period of each line may be fixed or randomly determined. Please refer to FIG. 3a, which is a schematic diagram of inserting a blank period during a frame scan period in the picture display method of the present invention that can automatically adjust the frame rate, where VS is a vertical synchronization signal, HS is a horizontal synchronization signal, and PSSW is a section of electricity. Switching signal, the new VS period is a longer vertical synchronization signal period formed by inserting a blank period in the original VS period, and the high potential period of PSSW corresponds to the blank period to be related to the blank period. And refer to Figure 3b, which is a schematic diagram of inserting a blank period in each line scan period in the picture display method of the present invention that can automatically adjust the frame rate, where VS is a vertical synchronization signal, and HS is A horizontal synchronization signal, PSSW is an electrical switching signal, the new VS period is a longer vertical synchronization signal period formed by inserting a blank period in each HS period in the original VS period, and the high potential period of PSSW is Corresponding to this blank period to turn off the circuit units other than the controller during this blank period.

In addition, the length of the variable blank period can be determined by the number of frames of a plurality of consecutive frames that meet a similarity rule, where the similarity rule can be: the pixel data of the entire frame of the two consecutive frames is the same Or the two consecutive frames have the same pixel data cyclic redundancy check code (cyclic redundancy check code; CRC code); or the control circuit does not detect the screen data write instruction; or the two consecutive frames The difference of each corresponding pixel data of the two frames does not exceed a threshold; or a cumulative value of the difference of the corresponding pixel data of the two consecutive frames does not exceed a threshold; or the two consecutive frames have a corresponding The pixel data block (such as a line of pixel data, in which the R, G, and B sub-pixel data of each pixel can be calculated separately) has a center of gravity difference that does not exceed a threshold; or the two consecutive frames are in full The difference in the position of a center of gravity of the frame pixel data (the R, G, and B sub-pixel data of each pixel can be calculated separately) does not exceed a threshold.

In addition, please refer to FIG. 4a, which is a schematic diagram of using the control circuit to adaptively select a Gamma curve according to the variable blank period in step b of the picture display method capable of automatically adjusting the frame rate of the present invention; and FIG. 4b, which It is a schematic diagram of an embodiment in which the control circuit is used to adaptively adjust a brightness value according to the variable blank period in the picture display method with automatic frame rate adjustment in step b of the present invention, wherein, after the picture enters B from A, The brightness value of a brightness control signal BC increases with the period of the vertical synchronization signal VS (caused by the lengthening of the variable blank period) first gradually climbs to BC1, then stays at BC1 for a period of time, and then the vertical synchronization signal VS The period becomes smaller and gradually drops to BC2, and then stays at BC2 for a period of time, then the period of the vertical synchronization signal VS becomes larger and gradually climbs to BC3, and then stays at BC3 for a period of time.

In addition, please refer to Figure 4c, which is the picture display method of the present invention that can automatically adjust the frame rate. The control circuit uses the control circuit to gradually adjust the display frame rate to the original frame rate during the mode switching (switching from the normal operating mode to the standby mode). Then send a schematic diagram of a standby command. According to this, you can avoid the abnormal phenomenon of the screen.

In addition, when the period of the horizontal synchronization signal HS is lengthened, if the period of a charge pump clock signal used to control a charge pump circuit does not change synchronously, glitches may occur; and if the charge pump clock The period of the signal changes synchronously, although there will be no glitch phenomenon, but if the frequency is too low, the output voltage of the charge pump will be unstable. Please refer to FIG. 5a, which shows a block diagram of a signal shaping circuit in step c of FIG. 2. As shown in FIG. 5a, the signal shaping circuit has a charge pump clock signal generating unit 10, a glitch detection unit 11, a mask signal generating unit 12, and a gate 13. The charge pump clock signal generating unit 10 is Used to generate a first charge pump clock signal PCLK1; the glitch detection unit 11 is used to detect a glitch phenomenon of the first charge pump clock signal PCLK1; An output signal generates a mask signal MSK; and the gate 13 is used to perform a logical AND operation on the mask signal MSK and the first charge pump clock signal PCLK1 to generate a second charge pump clock signal PCLK2, so that A charge pump circuit provides a stable charge pump output voltage. Please refer to FIG. 5b, which shows a working waveform diagram of the signal shaping circuit of FIG. 5a. As shown in FIG. 5b, the second charge pump clock signal PCLK2 has an elongated low potential period in the second cycle, and the elongated low potential period borrows a part of the time of the third cycle. In this way, it is possible to effectively avoid glitches on the charge pump clock signal. In addition, it should be pointed out that the signal shaping circuit of FIG. 5a is used to eliminate the negative burr generated by the first charge pump clock signal PCLK1, and when the charge pump circuit uses another trigger method to make the first charge pump clock signal When PCLK1 may have a positive glitch, logic or circuit can be used as a masking method to eliminate the positive glitch.

In addition, the present invention further discloses a display device. Please refer to FIG. 6, which shows a block diagram of an embodiment of the display device of the present invention. As shown in FIG. 6, a display device 100 has a control circuit 110 and a display screen 120, and the control circuit 100 is used to implement the aforementioned method for displaying images with automatically adjustable frame rate.

In addition, the present invention further discloses an information processing device. Please refer to FIG. 7, which shows a block diagram of an embodiment of the information processing device of the present invention. As shown in FIG. 7, an information processing device 200 has a central processing unit 210 and a display device 100. The display device 100 has a control circuit 110 and a display screen 120. The control circuit 100 is used to perform the aforementioned A picture display method with automatic frame rate adjustment, and the central processing unit 210 is used to communicate with the control circuit 110 of the display device 100.

In possible embodiments, the information processing device 200 may be a smart phone or a portable computer device.

With the design disclosed above, the present invention has the following advantages:

1. The picture display method of the present invention that can automatically adjust the frame rate can provide an adjustable frame rate by inserting a blank period during each frame scan period or each line scan period, thereby maintaining good performance while saving power. Picture display quality.

2. The frame rate can be automatically adjusted according to the present invention. The frame rate can be determined by detecting the similarity of multiple consecutive frames to maintain a smooth screen display effect while saving power.

3. The picture display method of the present invention that can automatically adjust the frame rate can also adjust the Gamma curve and/or the brightness value in the process of adjusting the frame rate to maintain good picture display quality.

The disclosure in this case is a preferred embodiment, and any partial changes or modifications that are derived from the technical ideas of the case and can be easily inferred by those who are familiar with the art do not deviate from the scope of the patent right of the case.

In summary, regardless of the purpose, means, and effects of this case, it is shown that it is very different from the conventional technology, and its first invention is practical, and it does meet the patent requirements of the invention. Please check it out and grant the patent as soon as possible. Society is for the best prayer.

10: Charge pump clock signal generation unit

11: Glitch detection unit

12: Mask signal generation unit

13: and gate

100: display device

110: control circuit

120: display

200: Information processing device

210: Central Processing Unit

Step a: Use the control circuit to insert a variable blank period during each frame scan period or each line scan period of the display screen to adjust the frame rate of the display screen, wherein the variable blank period refers to the The period during which the control circuit does not scan the pixel array

Step b: Use the control circuit to adaptively select a Gamma curve and/or a brightness value according to the variable blank period, and/or make the control circuit enter a power-saving operation mode according to the variable blank period

Step c: Use a signal shaping circuit in the control circuit to process a charge pump clock signal so that a charge pump circuit provides a stable charge pump output voltage

Figure 1 shows a schematic diagram of a conventional frame skipping technical solution. FIG. 2 shows a flowchart of an embodiment of a picture display method capable of automatically adjusting the frame rate of the present invention. FIG. 3a is a schematic diagram of the image display method capable of automatically adjusting the frame rate of the present invention inserting a blank period during a frame scanning period. FIG. 3b is a schematic diagram of the picture display method capable of automatically adjusting the frame rate of the present invention inserting a blank period during each line scanning period. FIG. 4a is a schematic diagram of the image display method capable of automatically adjusting the frame rate of the present invention in step b of FIG. 2 using the control circuit to adaptively select a Gamma curve according to the variable blank period. 4b is a schematic diagram of an embodiment in which the control circuit is used in step b of FIG. 2 to adaptively adjust a brightness value according to the variable blank period in the picture display method capable of automatically adjusting the frame rate of the present invention. Fig. 4c is the picture display method with automatic frame rate adjustment of Fig. 2. The control circuit uses the control circuit to gradually adjust the display frame rate to the original frame rate during the mode switching (switching from normal working mode to standby mode) and then send a standby command Schematic diagram. FIG. 5a is a block diagram of a signal shaping circuit in step c of FIG. 2. FIG. Fig. 5b is a working waveform diagram of the signal shaping circuit of Fig. 5a. FIG. 6 is a block diagram of an embodiment of the display device of the present invention. FIG. 7 is a block diagram of an embodiment of the information processing device of the present invention.

Step a: Use the control circuit to insert a variable blank period during each frame scan period or each line scan period of the display screen to adjust the frame rate of the display screen, wherein the variable blank period refers to the The period during which the control circuit does not scan the pixel array

Step b: Use the control circuit to adaptively select a Gamma curve and/or a brightness value according to the variable blank period, and/or make the control circuit enter a power-saving operation mode according to the variable blank period

Step c: Use a signal shaping circuit in the control circuit to process a charge pump clock signal so that a charge pump circuit provides a stable charge pump output voltage

Claims (9)

A picture display method capable of automatically adjusting the frame rate is realized by driving a pixel array of a display screen through a control circuit. The method is characterized by including the following steps: using the control circuit to scan each frame of the display screen A variable blank period is inserted during each scanning period or each line to adjust the frame rate of the display screen. The variable blank period refers to the period during which the control circuit does not scan the pixel array; The length of the variable blanking period is determined by the number of frames of a plurality of consecutive frames that meet a similarity rule. According to claim 1, the screen display method capable of automatically adjusting the frame rate, wherein the position of the variable blank period in the scanning period of each frame or the scanning period of each line is fixed or randomly determined. The picture display method that can automatically adjust the frame rate as described in claim 1, wherein the similarity rule means that the pixel data of the entire frame of the two consecutive frames is the same, or that the two consecutive frames have the same Pixel data cyclic redundancy check code, or the control circuit does not detect the picture data write command. The screen display method that can automatically adjust the frame rate as described in claim 1, wherein the similarity rule means that the difference between the corresponding pixel data of the two consecutive frames does not exceed a threshold, or two frames A cumulative value of the difference between the corresponding pixel data of the continuous frames does not exceed a threshold, or the difference in the position of a center of gravity of a corresponding pixel data block of the two consecutive frames does not exceed a threshold, or two The difference in the position of a center of gravity of the pixel data of the entire frame of the continuous picture does not exceed a threshold. The picture display method capable of automatically adjusting the frame rate as described in claim 1, further comprising the following steps: using the control circuit to adaptively select a Gamma curve and/or a brightness value according to the variable blank period. The picture display method capable of automatically adjusting the frame rate as described in claim 1, further comprising the following steps: using the control circuit to enter the power-saving operation mode according to the variable blank period. The screen display method capable of automatically adjusting the frame rate as described in claim 1, which further includes It includes the following steps: using a signal shaping circuit in the control circuit to process a charge pump clock signal so that a charge pump circuit provides a stable charge pump output voltage. A display device, which has the control circuit and the display screen as described in claim 1, and the control circuit is used to execute the screen display method capable of automatically adjusting the frame rate as described in any one of claims 1-7 . An information processing device having a central processing unit and the display device according to claim 8, wherein the central processing unit is used to communicate with the control circuit, and the information processing device is a smart phone or A portable computer device.

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