TWI406559B - Display method and computer readable medium performing thereof - Google Patents

Abstract

A display method for driving a display via a transmission interface, corresponding to a maximum transmission capability, includes the following steps. Firstly, video data including a number of frame data are provided. Next, a horizontal blinking period and a vertical blinking period are determined. Then data transmission amount corresponding to first frame rate, resolution of the frame data, the horizontal and the vertical blinking periods are determined. After that, whether the data transmission amount is greater than the maximum transmission capability is determined, if not, the video data are outputted.

Description

Display method and computer readable medium for executing the same

The present invention relates to a display method, and more particularly to a display method for driving a display to display three-dimensional image data.

In the current era of rapid technological development, three-dimensional display technology has been developed to provide users with stereoscopic display effects. For example, the 3D display technology inserts two corresponding to the left eye in one frame time (for example, 1/60 second) with twice the picture update frequency (for example, from 60 Hz to 120 Hz). An image of the viewing angle and the right-eye viewing angle; and a pair of shutter glasses that selectively shield the user's two-eye line of sight according to the corresponding screen update frequency to provide an image with a horizontal viewing angle difference to the user's left The eye and the right eye are used to simulate a three-dimensional image with a difference in horizontal viewing angle between the eyes.

However, when implementing the foregoing three-dimensional display technology, the display is required to perform a screen update operation corresponding to the doubled picture update frequency, so that the length of the data update period and the length of the image display period in each frame period are compressed. And the brightness of the display screen of the display is lowered because the image display period is too short. In addition, as the display pixels are increased, the amount of image data is correspondingly increased, so that the amount of data displayed on the screen is higher than the maximum amount of data transmitted by the transmission interface, resulting in loss of signals. In this way, how to design a situation in which the display image can be improved because of the three-dimensional display effect is one of the directions that the industry is constantly striving for.

The present invention relates to a display method that utilizes a method of selectively updating a low picture frequency such that a longer image display period is included in each frame period at a fixed data transfer rate. Accordingly, the related display method of the present invention can effectively improve the length of the image display period and the brightness of the display screen compared to the conventional three-dimensional display method.

According to a first aspect of the present invention, a display method is provided for driving a display via a transmission interface, the transmission interface having an interface maximum data transmission amount. The display method includes the following steps. First, provide image data, including multiple frames, and then determine the horizontal and vertical periods of each frame. Then, the first screen update frequency related to the image data, the resolution of each frame data, the horizontal period and the vertical period data transmission amount are found, and then it is judged whether the data transmission amount is greater than the interface maximum data transmission amount, and if not, the output video material.

According to a second aspect of the present invention, a computer readable medium is provided for performing a display method to drive a display. The display method includes the following steps. First, provide image data, including multiple frames, and then determine the horizontal and vertical periods of each frame. Then, the first screen update frequency related to the image data, the resolution of each frame data, the horizontal period and the vertical period data transmission amount are found, and then it is judged whether the data transmission amount is greater than the interface maximum data transmission amount, and if not, the output video material.

In order to make the above-mentioned contents of the present invention more comprehensible, a preferred embodiment will be described below, and in conjunction with the drawings, a detailed description is as follows:

The display method of the embodiment of the present invention increases the length of the image display period in each frame period by selectively reducing the picture update frequency.

Please refer to FIG. 1 , which is a block diagram showing a display system to which the display method of the embodiment of the present invention is applied. The display method of the embodiment of the present invention is applied to the display system 1. For example, the display system 1 includes a display driving circuit 12 and a display 14. The display driving circuit 12 is configured to provide image data VD to drive the display 14 to display a corresponding image frame. The display method of the present invention can be applied to a shutter glasses, a shutter on glass or a directional back light three-dimensional display. In order to make the content of the present invention easy to understand, the following is a description of the shutter glasses. The image data VD is a shutter type three-dimensional image data, and the user of the display system 1 needs to match the shutter type three-dimensional image displayed on the display 14. Wear compatible shutter glasses.

Between the display driver circuit 12 and the display 14, for example, there is a transmission interface 16 through which the display driver circuit 12 provides the image data VD to the display 14. The transmission interface 16 can be a digital video interface (DVI) or a high-definition multimedia interface (HDMI), and minimizes the Minimized Differential Signaling (TMDS) technology. For the interface of image data transmission, the maximum data transmission volume of the interface is M stroke data per second. The display 14 displays the image data VD at the screen update frequency R.

Referring to FIG. 2, the image data VD includes a plurality of frame data, and the horizontal resolution and the vertical resolution of each frame data correspond to the W stroke pixel data and the H stroke pixel data respectively. The writing operation period corresponding to the image data VD further includes a vertical blanking period vb (Vertical Blanking) and a horizontal period hb (horizontal blanking).

3 is a timing diagram of display screen update. A Time Period of Frame (TPF) TPX includes two picture frame periods TPF(n) and TFP(n+1). During the frame period, TPF(n) and TPF(n+1) include the data update period (TP_1) and the image display period (TP_2), and the ratio of the image display period (TP_2) to the frame period is determined by the number. The size of the vb during the vertical period is affected.

In the data update period TP_1, the display 14 updates the Pixel based on a specific frame data of the image data VD. Thus, in the data update period TP_1, the shutter glasses worn by the user shield the eyes of the user's eyes to prevent the user from viewing the frame picture that has not been updated. For example, in the data update period TP_1 in the frame period TPF(n), the specific frame data is the frame data corresponding to the left eye angle of the user; during the frame period TPF (n+1) In the data update period TP_1, the specific frame data is the frame data corresponding to the user's right eye angle of view.

For example, the display 14 sequentially updates the W×H pixels from left to right and from top to bottom, as shown in FIG. 2 . In other words, during the data update period TP_1 includes the H segment scanning operation (Data Scan) period.

During the image display period TP_2, the display 14 has completed the operation of updating the data according to the frame data, so that during the frame period TPF(n) and TPF(n+1) data update period TP_2, the shutter glasses The shutters for shielding the left eye and the right eye of the user are respectively opened, so that the frame screen corresponding to the left eye angle of view enters the left eye of the user, and the frame screen corresponding to the right eye angle of view enters the right eye of the user.

The length of the image display period TP_2 is related to the data transmission rate of the transmission interface 16 and the horizontal resolution W, the vertical resolution H of the display 14, and the image update rate, wherein the vertical period vb determines the length of the image display period TP_2. The relationship between the data transmission amount Dx and the maximum data transmission amount M of the transmission interface 16 satisfies:

Dx=(W+hb)×(H+vb)×R M

Please refer to FIG. 4, which illustrates a flow chart of a display method in accordance with an embodiment of the present invention. In order to obtain a better picture quality, the present invention proposes a method of changing the update frequency to adjust the vertical period, which has the following steps. First, as step (a), the image data VD is provided, and the image data VD includes a plurality of frame data. Next, as in step (b), the horizontal period hb and the vertical period vb of each frame data are determined.

Then, in step (c), the data update frequency R related to the image data VD, the resolution W×H of each of the frame data, the horizontal period hb, and the data transmission amount Dx of the vertical period vb are found. Next, as in step (d), it is determined whether the data transmission amount Dx is greater than the interface maximum data transmission amount M. If not, step (e) is executed to output the image data VD in accordance with the existing picture update frequency R, the horizontal period hb, and the vertical period vb.

When the data transmission amount Dx is greater than the interface maximum data transmission amount M, step (f) is performed to reduce the picture update frequency R of the image data VD to be r1. Then, step (g) is executed to determine whether the reduced picture update frequency r1 is smaller than the picture update frequency lower limit value. For example, the lower limit of the picture update frequency is related to the lowest update frequency at which the human eye produces a visual persistence effect. In the image data with the update frequency of 60 Hz (Hertz, Hz), the lower limit of the update frequency of the picture is equal to 50 Hz; for the image data with the update frequency of 120 Hz, the lower limit of the update frequency of the picture is equal to 100 Hz; For updating the image data of the frequency, the lower limit of the update frequency of this picture is equal to 200 Hz.

When the reduced picture update frequency r1 is not less than the picture update frequency lower limit value, steps (c) and (d) are repeatedly performed to find the data transmission amount Dx' corresponding to the reduced picture update frequency, and the data is judged. Whether the transmission amount Dx' is larger than the maximum data transmission amount M of the interface.

Step (h) is performed when the reduced picture update frequency r1 is less than the lower limit of the picture update frequency, to set the picture update frequency R of the image data VD to be equal to the lower limit value of the picture update frequency, and repeat step (b), The horizontal period hb and the vertical period vb are determined correspondingly.

Next, a number of operational examples will be given to further illustrate the display method of the present embodiment.

First operation example

The horizontal resolution W and the vertical resolution H of the image data VD are 1920 and 1080 pixel data respectively, the picture update frequency R is 120 Hz, and the maximum data transmission amount M of the interface of the transmission interface 16 is 330 megahertz (MHz). Thus, the display method of the present operation example determines that the horizontal period vb and the vertical period vb are 70 and 500 respectively in the step (b), and correspondingly finds the data transmission amount according to the following equations in the steps (c) and (d). Dx, and judge that the data transmission amount Dx is larger than the interface maximum data transmission amount M:

Dx=(1920+70)×(1080+500)×120 377MHz>M

Then, the display method of the operation example performs steps (f) and (g) to reduce the picture update frequency R to the reduced picture update frequency r1, and determines whether the reduced picture update frequency r1 is smaller than the picture update frequency lower limit. r _min . For example, step (f) reduces the picture update frequency R by 20 Hz as a decrementing unit. In other words, the reduced picture update frequency r1 is equal to 100 Hz, for example, and the picture update frequency lower limit r _{min is} also equal to, for example, 100 Hz. Accordingly, the reduced picture update frequency r1 is greater than or equal to the picture update frequency lower limit value _rmin , and then the display method of the present operation example repeats steps (c) and (d) to find and reduce the picture according to the following equation. Update the data transmission amount Dx' corresponding to the frequency r1, and judge that the data transmission amount Dx' is substantially smaller than the interface maximum data transmission amount M:

Dx=(1920+70)×(1080+500)×100 314MHz<M

After the step (d), the display method of the present operation example performs the step (e) to output the image data VD according to the existing configuration.

Second operation example

Similar to the first operation example, the image data VD has the same horizontal resolution W, the vertical resolution H, and the picture update frequency R is 120 Hz; and the maximum data transmission amount M of the interface of the transmission interface 16 is also 330 MHz. The difference from the first operation example is that the display method of the present operation example determines that the horizontal period vb and the vertical period vb are 70 and 600, respectively, in the step (b). According to the display method steps (c) and (d) of the present operation example, the data transmission amount Dx is correspondingly found according to the following equation, and it is judged that the data transmission amount Dx is larger than the interface maximum data transmission amount M:

Dx=(1920+70)×(1080+600)×120 401MHz>M

Then, the display method of the operation example performs steps (f) and (g) to reduce the picture update frequency R to the reduced picture update frequency r1, and determines whether the reduced picture update frequency r1 is smaller than the picture update frequency lower limit. r _min . For example, the reduced picture update frequency r1 is, for example, equal to 100 Hz, and the picture update frequency lower limit is also equal to, for example, 100 Hz. Accordingly, the decrease of a frame rate of greater than or equal to the limit value r1 r _min at a frame rate, then repeating steps (c) and (D), to find out the picture data and the reduced frequency of the update of the following equation corresponding to r1 The transmission amount Dx', and judge that the data transmission amount Dx' is still greater than the interface maximum data transmission amount M:

Dx=(1920+70)×(1080+600)×100 334MHz>M

Accordingly, the display method of the present operation example repeats steps (f) and (g) to reset the reduced picture update frequency r1 again to obtain a reduced picture update frequency r2 substantially equal to 90 Hz, and judges the decrease. Whether the picture update frequency r2 is smaller than the picture update frequency lower limit value _rmin (that is, 100 Hz). Accordingly, the reduced picture update frequency r2 is smaller than the picture update frequency lower limit value _rmin , and the display method of the present operation example performs step (h) to set the picture update frequency R of the image data VD to be equal to the lower limit of the picture update frequency. The value r _min (i.e., 100 Hz) is repeated, and step (b) is repeated to determine the horizontal period hb and the vertical period vb correspondingly. For example, the horizontal period hb and the vertical period vb are equal to 70 and 578, respectively.

After the display operation example of the method of the present system executes step (c) and (D), to find the corresponding value r _min to the update frequency of the screen corresponding to a frame rate R of the transmission data amount Dx according to the following equation, and the determination information The transmission amount Dx is substantially less than or equal to the interface maximum data transmission amount M:

Dx=(1920+70)×(1080+578)×100 330MHz=M

After the step (d), the display method of the present operation example performs the step (e) to output the image data VD according to the existing configuration.

Third operation example

Similar to the first and second operation examples, the image data VD has the same horizontal resolution W, the vertical resolution H, and the picture update frequency R is 120 Hz; and the maximum data transmission amount M of the interface of the transmission interface 16 is also 330 MHz. The difference from the second operation example is that the display method of the present operation example determines that the horizontal period vb and the vertical period vb are 70 and 700, respectively, in the step (b). According to the display method steps (c) and (d) of the present operation example, the data transmission amount Dx is correspondingly found according to the following equation, and it is judged that the data transmission amount Dx is larger than the interface maximum data transmission amount M:

Dx=(1920+70)×(1080+700)×120 425MHz>M

Similar to the second operation example, the present operation example shows that the steps (f), (g), (c), (d), (f), (g), and (h) are sequentially performed after the step (d). ), the picture update frequency R of the set image data VD is equal to the picture update frequency lower limit value r _min (that is, 100 Hz). After the step (h), the display method of the present operation example repeats the step (b) to correspondingly determine the horizontal period hb and the vertical period vb. Unlike the second operation example, the display method of this operation example sets the horizontal period hb to 0 in step (b) and sets the vertical period vb to 638.

Then, the display method of the present operation example performs steps (c) and (d) to find the data transmission amount Dx corresponding to the picture update frequency R corresponding to the picture update frequency lower limit value r _min according to the following equation, and judge the data. The transmission amount Dx is substantially smaller than the interface maximum data transmission amount M:

Dx=(1920+0)×(1080+638)×100 329MHz<M

After the step (d), the display method of the present operation example performs the step (e) to output the image data VD according to the existing configuration. In this example of operation, the vertical period Vb accounts for 37.14% of the entire frame time (638/(1080+638).

In the present embodiment, the case where the display method of the present embodiment has the flowchart shown in FIG. 4 is taken as an example. However, the display method of the present embodiment is not limited thereto. In other examples, the display method of this embodiment may also have a flowchart as shown in FIG.

Furthermore, the flowchart shown in FIG. 5 is different from the flowchart shown in FIG. 4 in that it further includes step (i) between steps (d) and (f) for data transmission. When Dx is greater than the maximum data transmission amount M of the interface of the transmission interface 16, it is determined whether the picture update frequency R of the image data VD at this time is substantially equal to the picture update frequency lower limit value _rmin . When the picture update frequency R of the image data VD is substantially equal to the picture update frequency lower limit value r _min , the display method of the present embodiment directly repeats the step (b) to re-determine the values of the horizontal period hb and the vertical period vb. When the picture update frequency R of the image data VD is not equal to the picture update frequency lower limit value _Rmin , the display method of the present embodiment performs step (f) to correspondingly perform the lowering operation of the picture update frequency R. Next, an example will be given to further explain the flowchart shown in Fig. 5 of the present invention.

Fourth operation example

Similar to the foregoing first to third operational examples, the image data VD has the same horizontal resolution W, the vertical resolution H, and the picture update frequency R is 120 Hz; and the maximum data transmission amount M of the interface of the transmission interface 16 is also 330 MHz; The display method of the operation example determines that the horizontal period vb and the vertical period vb are 70 and 700, respectively, in the step (b). According to the display method steps (c) and (d) of the present operation example, the data transmission amount Dx is correspondingly found according to the following equation, and it is judged that the data transmission amount Dx is larger than the interface maximum data transmission amount M:

Dx=(1920+70)×(1080+700)×120 425MHz>M

Then, step (i) is performed to determine whether the picture update frequency R (=120 Hz) of the image data VD is substantially equal to the picture update frequency when the data transmission amount Dx is greater than the maximum data transmission amount M of the interface of the transmission interface 16. The limit value r _min (=100Hz); if not, the steps (f), (g), (c) and (d) are sequentially performed to set the picture update frequency R of the image data VD to be equal to the lower limit of the picture update frequency. The value r _min (that is, 100 Hz); find the data transmission amount Dx' according to the re-set picture update frequency; and judge that the data transmission amount Dx' is still larger than the large data transmission amount M:

Dx=(1920+70)×(1080+700)×100 372MHz>M

Then, step (i) is repeatedly executed to determine whether the picture update frequency R (=100 Hz) of the image data VD is substantially equal to the picture update frequency when the data transmission amount Dx is greater than the maximum data transmission amount M of the interface of the transmission interface 16. The limit value r _min (=100 Hz); if so, the display method of this example directly performs step (b) to correspondingly determine the horizontal period hb and the vertical period vb. For example, the display method of this operation example sets the horizontal period hb to 0 in step (b) and sets the vertical period vb to 650. According to the display method steps (c) and (d) of the present operation example, the data transmission amount Dx is correspondingly found according to the following equation, and it is judged that the data transmission amount Dx is still larger than the interface maximum data transmission amount M:

Dx=(1920+0)×(1080+650)×100 332MHz>M

Then, step (i) is performed to determine again whether the picture update frequency R (=100 Hz) of the image data VD at this time is substantially equal to the picture update frequency lower limit value r _min (=100 Hz); if so, the display method of the present example Step (b) is directly executed to determine the horizontal period hb and the vertical period vb correspondingly. For example, the display method of this operation example sets the horizontal period hb to 0 in step (b) and sets the vertical period vb to 638. According to the display method steps (c) and (d) of the present operation example, the data transmission amount Dx is correspondingly found according to the following equation, and it is judged that the data transmission amount Dx is substantially equal to the interface maximum data transmission amount M:

Dx=(1920+0)×(1080+638)×100 330MHz=M

After the step (d), the display method of the present operation example performs the step (e) to output the image data VD according to the existing configuration. In this example of operation, the vertical period Vb accounts for 37.14% of the entire frame time (638/(1080+638).

In the foregoing embodiment of the present invention, the display method of the embodiment is applied to the shutter type three-dimensional display as an example. However, the display method of the embodiment is not limited to the application in the shutter type three-dimensional display. . In one embodiment, the display 14 to which the display method of the present embodiment is applied may also be a polarized three-dimensional display.

In this embodiment, in the picture frame screen provided by the polarization type three-dimensional display, the frame picture corresponding to the left eye and the frame picture of the right eye are respectively polarized to be polarized light of the first angle and the first Two angles of polarized light, wherein the polarized light of the first angle and the second angle has an angle of 90 degrees. The left eye and the right eye of the polarized glasses worn by the user respectively have polarizing lenses corresponding to the first angle and the second angle, so that the left eye and the right eye of the user respectively receive the corresponding first angle and The frame picture of this second angle. In this embodiment, the polarization type three-dimensional display also displays the frame picture corresponding to the left eye and the right eye by increasing the frame update rate. Accordingly, the display method of the embodiment can also be applied to a polarized three-dimensional display, in order to obtain a longer image display during each frame period in an operation scenario in which the screen update frequency is multiplied and the image data transmission rate is fixed. period.

In another embodiment, the display 14 to which the display method of the present embodiment is applied may also be a pointing-back type three-dimensional display having a directional backlight module that can provide a backlight of a first angle and a backlight of a second angle. In this embodiment, the pointing backlight module is provided in the frame picture of the frame corresponding to the left eye and the frame picture of the right eye respectively. The backlight of the first angle and the second angle, according to which the left eye and the right eye of the user respectively receive the frame picture corresponding to the left eye and the right eye. In this embodiment, the pointing back-type three-dimensional display also displays the frame picture corresponding to the left eye and the right eye by increasing the frame update rate. Accordingly, the display method of the embodiment can also be applied to a back-lit three-dimensional display, in order to obtain a longer image in each frame period in an operation situation in which the screen update frequency is multiplied and the image data transmission rate is fixed. Display period.

The display method of this embodiment utilizes a method of selectively updating the low picture frequency such that a longer image display period is included in each frame period at a fixed data transfer rate. Accordingly, the related display method of the present embodiment can effectively improve the length of the image display period and the brightness of the display screen compared to the conventional three-dimensional display method.

In view of the above, the present invention has been disclosed in a preferred embodiment, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

12. . . Display driver circuit

14. . . monitor

16. . . Transmission interface

FIG. 1 is a block diagram showing a display system to which the display method of the embodiment of the present invention is applied.

Figure 2 shows the timing diagram of the TPF during the frame period.

Figure 3 is a schematic diagram of the TPF during the frame period.

FIG. 4 is a flow chart showing a display method according to an embodiment of the present invention.

FIG. 5 is another flow chart showing a display method according to an embodiment of the present invention.

(a)-(h). . . Process step

Claims (11)

A display method for driving a display via a transmission interface, the transmission mask having an interface maximum data transmission amount, the display method comprising: providing an image data, including a plurality of frame data; determining one of the frame materials a horizontal period and a vertical period; finding a first picture update frequency associated with one of the image data, a resolution of each of the frame data, a data period of the horizontal period and the vertical period; determining the data transmission amount Whether it is greater than the maximum data transmission amount of the interface; when the data transmission amount is not greater than the maximum data transmission amount of the interface, the image data is output; when the data transmission amount is greater than the maximum data transmission amount of the interface, the image data is reduced. a picture update frequency; determining whether the reduced first frame update frequency is less than a second picture update frequency; and repeatedly finding the data when the reduced first picture update frequency is not less than the second picture update frequency The step of transmitting the amount to find the amount of data transmission corresponding to the reduced frequency of the first picture update. The display method of claim 1, further comprising: setting the first picture update frequency of the image data to be equal to the second when the reduced first picture update frequency is less than the second picture update frequency The picture update frequency, and then the steps of determining the horizontal period and the vertical period are repeated. The display method of claim 1, further comprising: determining whether the first picture update frequency is substantially equal to the second picture update frequency when the data transmission amount is greater than the maximum data transmission amount of the interface; When the first picture update frequency is not equal to the second picture update frequency, the first picture update frequency of the image data is decreased; whether the reduced first frame update frequency is less than a second picture update frequency; and When the first picture update frequency is not less than the second picture update frequency, the step of finding the data transmission amount is repeated to find the data transmission amount corresponding to the reduced first picture update frequency. The display method of claim 3, further comprising: when the first picture update frequency is substantially equal to the second picture update frequency, repeating the step of finding the data transmission amount to find and reduce The data transmission amount corresponding to the first picture update frequency. The display method of claim 3, further comprising: setting the first picture update frequency of the image data to be equal to the second when the reduced first picture update frequency is less than the second picture update frequency The picture update frequency, and then the steps of determining the horizontal period and the vertical period are repeated. For example, in the display method described in claim 1, the horizontal resolution and the vertical resolution of each of the frame data correspond to 1920 stroke data and 1080 pixel data, respectively. According to the display method of claim 6, the maximum data transmission amount of the interface of the transmission interface is 330 million strokes per second. The display method according to claim 7, wherein the frame period includes a data update period and an image display period (V-blanking), wherein the frame update period is determined according to the screen update rate. The ratio of the image display period to the frame period is between 22% and 37.57%. The display method of claim 8, wherein the data update period and the image display period respectively correspond to a shutter period and a turn-on period of one of the shutter glasses. The display method of claim 1, wherein the display is a polarized on glass display, and the frame data is a polarization frame data with a picture update rate between 100 Hz and 120 Hz. The display method of claim 1, wherein the display is a directional back light display.