TWI455014B - Anti-tearing method for an image display, and an image display and an electronic device using the same - Google Patents

Description

Image display tearing method, and related image display and electronic device

The present invention relates to an image display tearing method, and related image display and electronic device.

Image display technology often faces the problem of tearing the picture.

Figure 1 illustrates a tearing picture. The original design displays the character 'A' on a first screen and the character 'B' on a second subsequent screen. The picture to be displayed is usually temporarily stored in a memory unit, waiting to be read and played. However, the frame rate of the image display may not coincide with the update rate of the picture data of the memory unit, so that the read and play of the first picture has not yet been completed, but the memory unit has been updated to the data of the second picture. In this way, there will be a tearing problem as shown in Fig. 1 - in actual display, the first half of the screen displays the first picture (character 'A'), but the lower half shows the second picture (character' B').

How to solve this tearing phenomenon is an important issue for image display technology.

The invention discloses a method for tearing off an image display, and related image display and electronic device.

An image display tearing method according to an embodiment, comprising the steps of: detecting a picture update signal of an image display; estimating a picture update rate of the image display according to the picture update signal; and updating according to the picture The operating parameter of the panel wafer in the image display is set to adjust the period during which the panel wafer captures the screen from the panel memory in the image display, and the screen update rate is fine-tuned to an expected value.

An image display implemented according to an embodiment includes a development area, a panel memory, a panel wafer, and a picture update rate adjustment module. This panel memory is used to temporarily store the screen. After the panel wafer acquires the screen from the panel memory, it will be played in the development area. A picture update signal of the image display must be detected by the picture update rate adjustment module. The screen update rate adjustment module estimates a screen update rate of the image display based on the screen update signal. According to the screen update rate, the screen update rate adjustment module sets the operation parameters of the panel wafer to adjust the period during which the panel wafer captures the screen from the panel memory, and fine-tunes the screen update rate to an expected value.

As for the disclosed electronic device, in addition to the above image display, a processor and a system memory are further included. The image data temporarily stored in the panel memory is read by the processor from the system memory and written to the panel wafer.

The above described objects, features, and advantages of the invention will be apparent from the description and appended claims appended claims

FIG. 2 is a block diagram showing a processor 102, a system memory GRAM_sys, and a screen update rate adjustment module 104 in addition to an image display 100 implemented in accordance with an embodiment of the present invention. The image display device 100 includes a development area 106, a panel wafer 108, a panel memory GRAM_Panel, and a vibrator 110.

In one embodiment, the image display device 100, the processor 102, and the system memory GRAM_sys belong to an electronic device. In the embodiment shown in the figure, the processor 102 reads the image data from the system memory GRAM_sys and writes the panel memory 108 to the panel memory GRAM_Panel. When the panel wafer 108 plays the screen in the driving display area 106, the image data is read from the panel memory GRAM_Panel. Such a design in which a panel memory GRAM_Panel is coupled to the panel wafer 108 is referred to as a smart panel. Since the frequent image data reading required to play the image occurs between the panel wafer 108 and the panel memory GRAM_Panel, the processor 102 does not need to be like the prior art (such as a low-level dump panel, without the panel memory GRAM_Panel) Frequently operated, the power consumption of the disclosed electronic device can be greatly reduced.

In the illustrated smart panel application, the read operation of the panel memory 108 to the panel memory GRAM_Panle can refer to the clock signal provided by the oscillating device 110. However, there may be an error in the oscillation of the vibrator 110, and the action of the panel wafer 108 to read the picture data from the panel memory GRAM_Panel cannot match the picture data update frequency of the panel memory GRAM_Panel. In order to avoid image tearing of the development area 106, the disclosed picture update rate adjustment module 104 provides the following operations.

The screen update rate adjustment module 104 will detect a picture update signal of the image display device 100 (eg, a vertical synchronization signal Vsync provided by the panel wafer 108). Based on the picture update signal (Vsync), the picture update rate adjustment module 104 estimates a frame rate of the picture display 100. Based on the screen update rate, the screen update rate adjustment module 104 sets the operation parameters of the panel wafer 108 (refer to the illustrated path 112) to adjust the period during which the panel wafer 108 takes the screen from the panel memory GRAM_Panel for playback. The screen update frequency of the panel memory GRAM_Panel can be matched. The above actions will adjust the picture update rate of the image display device 100 to an expected value (for example, 60 images per second), which is not affected by the oscillation error of the vibrator 110. In this way, the tearing of the picture can be effectively avoided.

Regarding the embodiment in which the vertical sync signal Vsync is a picture update signal, the pulse appearance frequency of the vertical sync signal Vsync can be used to estimate the picture update rate of the image display unit 100. Please note that the present invention does not limit the implementation of the picture update signal with the vertical sync signal Vsync. In other embodiments, other signals - for example, a drive signal for a particular line in the development region 106 - may be used as the picture update signal.

Regarding the panel chip 108, the operation parameters adjusted by the screen update rate adjustment module 104 may include: a line playback period (unit: clocks per line), a pre-shadow amount (generally called FP) For example, the number of blanking lines arranged in front of each screen or / and the amount of subsequent shadowing (generally referred to as BP, for example, the number of blanking lines arranged after each screen). Please note that this case does not limit the adjustable operating parameters of the panel chip to the line play period, the pre-shadow amount or / and the post-shadow amount. Any operational parameters provided by the panel wafer that can affect the picture update rate can be used to implement the present invention.

In addition, although only the path symbol 112 indicates the setting operation of the operation parameters of the panel wafer 108 by the screen update rate adjustment module 104, the embodiment is actually quite diverse. For example, it can be implemented in a firmware manner - the panel wafer 108 optimal operating parameter value obtained by the screen update rate adjustment module 104 is recorded in the firmware of the image display device 100, so that the panel wafer 108 can be based on the optimal operating parameters. Value operation. Moreover, in some embodiments, the picture update rate adjustment module is disposed in the image display and implemented in a soft/hard manner. This type of image display implements the disclosed screen update rate adjustment function in a built-in manner.

In addition, taking the embodiment of FIG. 2 as an example, the vertical synchronization signal Vsync can be further transmitted to the processor 102 for use. The processor 102 further considers the vertical synchronization signal Vsync when transmitting the image data in the system memory GRAM_sys to the panel memory GRAM_Panel, and confirms the reading rate of the panel memory 108 to the panel memory GRAM_Panel. This design is more effective in preventing tearing of the picture.

Figure 3 discusses the disclosed method of tearing off the picture in a flow chart manner. Step S302 first detects a picture update signal of an image display. Step S304, estimating a picture update rate of the image display according to the picture update signal. Step S306 is configured to set an operation parameter of a panel wafer in the image display according to the screen update rate, to adjust a period in which the panel wafer captures a screen from the panel memory in the image display, and fine-tune the screen update rate to an expected value. The method may use a vertical synchronization signal of the image display as the picture update signal; a frequency at which the pulse in the vertical synchronization signal appears is the picture update rate. In addition, the step S306 of adjusting the operation parameters of the panel wafer may include: adjusting one of a line play period, a pre-shadow amount, and a post-shadow amount.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

100. . . Image display

102. . . processor

104. . . Screen update rate adjustment module

106. . . Imaging area

108. . . Panel chip

110. . . Oscillator

112. . . Control path

GRAM_Panel. . . Panel memory

GRAM_sys. . . System memory

Step S302~: detecting a picture update signal of an image display;

Step S304~, estimating a picture update rate of the image display according to the picture update signal;

Step S306~, setting an operation parameter of a panel wafer in the image display according to the screen update rate, to adjust a period in which the panel wafer captures a screen from a panel memory in the image display, and fine-tuning the screen update rate to one Expected value;

Vsync. . . Vertical sync signal (picture update signal)

Figure 1 illustrates a tearing picture;

2 is a block diagram, in addition to an image display 100 implemented in accordance with an embodiment of the present invention, further showing a processor 102, a system memory GRAM_sys, and a screen update rate adjustment module 104;

Figure 3 discusses the disclosed method of tearing off the picture in a flow chart manner.

Step S302~: detecting a picture update signal of an image display;

Step S304~, estimating a picture update rate of the image display according to the picture update signal;

Step S306~, setting an operation parameter of a panel wafer in the image display according to the screen update rate, to adjust a period in which the panel wafer captures a screen from a panel memory in the image display, and fine-tuning the screen update rate to one Expected value.

Claims (9)

An image display tearing method includes: detecting a picture update signal of an image display; estimating a picture update rate of the image display according to the picture update signal; and setting a panel chip of the image display according to the picture update rate The operation parameter is used to adjust the period during which the panel wafer captures the screen from the panel memory in the image display, and the screen update rate is fine-tuned to an expected value. The image display tearing method according to claim 1, wherein a vertical synchronization signal of the image display is used as the picture update signal, and a frequency of occurrence of a pulse in the vertical synchronization signal is the picture update rate. The image display tearing method according to claim 1, wherein the driving signal of a specific line in the developing area of the image display is used as the picture update signal. The image display tearing method of claim 1, wherein the step of adjusting the operating parameters of the panel wafer comprises: adjusting one of a line playing period, a pre-shadowing amount, and a post-shaping amount. . An image display comprising: a developing area; a panel memory for temporarily storing a screen; a panel wafer, the screen is played from the panel memory to play in the developing area; and a screen update rate adjusting module, detecting Detecting a picture update signal of the image display, and estimating a picture update rate of the image display, and setting an operation parameter of the panel chip according to the picture update rate to adjust the panel chip to be obtained from the panel memory The period during which the picture is played is to fine tune the picture update rate to an expected value. The image display of claim 5, wherein the picture update signal is a vertical synchronization signal of the image display, and the frequency of the pulse in the vertical synchronization signal is the picture update rate. The image display of claim 5, wherein the drive signal of a specific line in the development area of the image display is used as the picture update signal. The image display of claim 5, wherein the operation parameter adjusted by the screen update rate adjustment module in the panel wafer comprises one of a line playback period, a pre-shadow amount, and a post-shadow amount. . An electronic device comprising: the image display of claim 5; and a system memory and a processor, wherein the image data temporarily stored in the panel memory is memorized by the processor from the system After the body is read, it is written by the panel wafer.