TWI449018B - Scanning backlight module, stereoscopic image displaying apparatus, method for driving scanning backlight module, and method for driving stereoscopic image displaying apparatus - Google Patents

Description

Scanning backlight module, stereoscopic image display device, driving method of scanning backlight module, and display method of stereoscopic image display device

The present invention relates to the technical field of stereoscopic images, and more particularly to a scanning backlight module, a stereoscopic image display device, a driving method of a scanning backlight module, and a display method of the stereoscopic image display device.

FIG. 1 is a diagram for explaining a driving sequence of a backlight module of a conventional stereoscopic image display device. In FIG. 1, the frame_m is indicated as the mth picture, and the frame_m+1 is indicated as the m+1th picture. K having scan lines (scan line), and a backlight module having the light source of the stereoscopic image display apparatus 5 as an example, Δ T _ _panel during each screen display, each lighting time difference of two regions adjacent to the light source Δ T _ _backlight , which is Δ T _ _panel /5. In this way, it is ensured that the scanning timing of the light source coincides with the scanning timing of the scanning line.

However, under actual conditions, even if the display panel of the stereoscopic image display device is divided into five regions to illuminate in the above manner, the light emitted by each light source will spread to other regions, and it is impossible to completely complete the point at a time. Bright single area. As a result, the brightness of the screen of the stereoscopic image display device is not uniform, and the crosstalk of the image is also increased.

The invention provides a scanning backlight module, which can effectively increase the uniformity of the screen brightness of the stereoscopic image display device and reduce the crosstalk interference of the image, so that the stereoscopic image display device can provide better stereo image quality.

Correspondingly, the present invention further provides a driving method of a scanning backlight module.

The present invention further provides a stereoscopic image display device using the above-described scanning backlight module.

Correspondingly, the present invention also provides a display method of a stereoscopic image display device.

The invention provides a scanning backlight module comprising an N-region light source and a light source driving circuit, wherein N is a natural number and N is greater than or equal to 3. The light source driving circuit is electrically connected to the N-region light source, and is configured to illuminate the light source during a display period according to a preset sequence, and the lighting time difference of each adjacent two-region light source satisfies the following formula:

Where Δ T_ _{panel is} represented as the above-described picture display period, and Δ T — _{backlight is} represented as the lighting time difference of each adjacent two-area light source.

Correspondingly, the present invention further provides a driving method of a scanning backlight module. The scanning backlight module includes an N-region light source, wherein N is a natural number, and N is greater than or equal to 3. The driving method includes the following steps: defining a lighting time difference of each adjacent two-zone light source, and the defined lighting time difference satisfies the following formula:

Where Δ T_ _{panel is} indicated for each picture display period, and Δ T_ _{backlight is} represented as the lighting time difference of each adjacent two-area light source; and during each screen display according to a preset order and the defined lighting time difference The above light source is illuminated inside.

The present invention further provides a stereoscopic image display device including a display module and a scanning backlight module. The display module further includes a display panel, a source driver, a gate driver and a timing controller. The source driver and the gate driver are electrically connected to the display panel. The timing controller is electrically connected to the source driver and the gate driver, and displays a left eye image and a right eye image according to a first preset sequence through the source driver and the gate driver control display panel. The scanning backlight module further includes an N-region light source and a light source driving circuit, wherein N is a natural number, and N is greater than or equal to 3. The light source driving circuit is electrically connected to the N-region light source, and is configured to illuminate the light source during each screen display period according to a second preset sequence, and the lighting time difference of each adjacent two-region light source satisfies the following formula:

Where Δ T_ _{panel is} represented as a display period for each picture, and Δ T — _{backlight is} expressed as a difference in lighting time per adjacent two-area light source.

Correspondingly, the present invention also provides a display method of a stereoscopic image display device. The stereoscopic image display device includes a display module and a scanning backlight module. The display module further includes a display panel, a source driver and a gate driver, and the source driver and the gate driver are electrically connected to the display panel. The scanning backlight module further includes an N-area light source, wherein N is a natural number and N is greater than or equal to 3. The display method includes the steps of: displaying a left-eye image and a right-eye image according to a first preset sequence through a source driver and a gate driver control display panel; and displaying an intra-point during each screen display according to the second preset sequence The above light source is illuminated, and the lighting time difference of each adjacent two-zone light source satisfies the following formula:

Where Δ T_ _{panel is} represented as a display period for each picture, and Δ T — _{backlight is} expressed as a difference in lighting time per adjacent two-area light source.

Means of the present invention to solve the aforementioned problems, but shortened II lighting time difference between each adjacent source, and based on the value of the ratio Δ T_ _panel / N value of Δ T_ _backlight and the effects for the screen brightness and uniformity of crosstalk The experimental data is used to limit the lighting time difference of each adjacent two-area light source within the range defined by the above relationship, so as to obtain better brightness uniformity of the picture and low crosstalk interference, thereby enabling the stereoscopic image display device to Provide better stereo image quality.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

First embodiment:

2 is a schematic diagram of a scanning backlight module according to an embodiment of the invention. The scanning backlight module 200 includes an N-region light source and a light source driving circuit 280, where N is a natural number and N is greater than or equal to 3. In this example, the scanning backlight module 200 uses a 5-zone light source (ie, N is 5) and is labeled 212-220, respectively. The light source driving circuit 280 is electrically connected to the above-mentioned 5-zone light source, and is configured to illuminate the light source during a screen display period according to a preset sequence (for example, from top to bottom), and illuminate each adjacent two-region light source. The time difference satisfies the following formula:

Where Δ T_ _{panel is} represented as the above-described picture display period, and Δ T — _{backlight is} represented as the lighting time difference of each adjacent two-area light source. The manner of obtaining the above formula will be described in detail later. Hereinafter, the driving timing of the scanning backlight module of the present invention will be described with reference to FIG. 3. Referring to FIG.

In FIG. 3, the frame_m is indicated as the mth picture (for example, a left-eye picture), and the frame_m+1 is indicated as the m+1th picture (for example, a right-eye picture), and the indication 1~k is represented as stereoscopic image display apparatus of the scanning lines, designated Δ T_ _panel shows a display screen for each period, and the marked difference is represented by Δ T_ _backlight lighting time of each adjacent two source regions. Referring to FIG. 1 and FIG. 3, by comparison, the time difference can be found in FIG. 3 of the lighting shown in FIG Δ T_ _backlight lighting time than the difference Δ T_ _backlight 1 of FIG come short. Further, as shown in FIG. 3 of the lighting time difference Δ T_ _backlight must meet the specifications defined in the preceding formulas. It should be noted that in the driving sequence shown in FIG. 3, the adjacent two screen display periods do not overlap, and the light source of any of the previous screen display periods (for example, the display period of the frame Frame_m) The lighting time does not overlap with the lighting time of the light source in any of the current screen display periods (for example, the display period of the frame Frame_m+1).

The following describes the definition of the above formula, please refer to the following list first:

Table 1 is an experimental data of the present invention. In Table 1, the Δ T_ _{panel is} indicated as the display period of each screen, and N is the number of light sources in the scanning backlight module, and the mark Δ T _ _{backlight is} expressed as The difference in lighting time between adjacent two-zone light sources. With a table, the value of the ratio can be obtained value Δ T_ _panel / N and Δ T_ _backlight of the crosstalk with respect to the uniformity of brightness of the screen, a shown in FIG. In FIG. 4, the same reference numerals as those in Table 1 indicate the same meaning. As can be seen from FIG. 4, in order to obtain better brightness uniformity of the picture and low crosstalk interference, the stereoscopic image display device can provide better stereo image quality, and the _{ΔT_backlight} (that is, each adjacent two) can be obtained. The difference in lighting time of the area light source is limited to the interval defined by the above equation. The above formula is listed again below:

With the above description, those skilled in the art can summarize some basic operational steps of the scanning backlight module of the present invention, as shown in FIG. 5. FIG. 5 is a flow chart of a driving method of a scanning backlight module according to an embodiment of the invention. The scanning backlight module includes an N-region light source, wherein N is a natural number, and N is greater than or equal to 3. Referring to FIG. 5, the driving method includes the following steps: defining a lighting time difference of each adjacent two-zone light source, and the defined lighting time difference satisfies the following formula: Where ΔT _{_ panel is} indicated for each picture display period, and ΔT _{_ backlight is} represented as the lighting time difference of each adjacent two-area light source (as shown in step S402); and according to a predetermined order and defined points The light source is illuminated and the light source is illuminated during each display period (as shown in step S404).

Second embodiment:

FIG. 6 is a schematic diagram of a stereoscopic image display device according to an embodiment of the invention. The stereoscopic image display device 600 includes a display module 610 and a scanning backlight module 650. The display module 610 further includes a timing controller 612, a source driver 614, a gate driver 616, and a display panel 618. The source driver 614 and the gate driver 616 are electrically connected to the display panel 618. The timing controller 612 is electrically connected to the source driver 614 and the gate driver 616, and controls the display panel 618 through the source driver 614 and the gate driver 616 to display the left-eye picture and the right-eye picture according to the first preset sequence. The scanning backlight module 650 further includes an N-region light source and a light source driving circuit 680, where N is a natural number and N is greater than or equal to 3. In this example, the scanning backlight module 650 uses a 5-zone light source (ie, N is 5) and is labeled 652-660, respectively. The light source driving circuit 680 is electrically connected to the above-mentioned 5-zone light source, and is configured to illuminate the light source during a screen display period according to a preset sequence (for example, from top to bottom), and illuminate each adjacent two-region light source. The time difference satisfies the following formula: Where ΔT _{_ panel is} indicated for each picture display period, and ΔT _{_ backlight is} represented as the lighting time difference of each adjacent two-area light source.

It should be noted that in the display mode of the stereoscopic image display device 600, the screen display periods of the right eye screen and the left eye screen are not overlapped, and the lighting time of the light source in any of the previous screen display periods is also It does not overlap with the lighting time of the light source in any of the current screen display periods, as in the manner shown in FIG.

With the above description, those skilled in the art can summarize some basic operational steps of the stereoscopic image display device of the present invention, as shown in FIG. FIG. 7 is a flowchart of a display method of a stereoscopic image display device according to an embodiment of the invention. The stereoscopic image display device includes a display module and a scanning backlight module. The display module further includes a display panel, a source driver and a gate driver, and the source driver and the gate driver are electrically connected to the display panel. The scanning backlight module further includes an N-area light source, wherein N is a natural number and N is greater than or equal to 3. Referring to FIG. 7, the display method includes the following steps: displaying a left-eye picture and a right-eye picture according to a first preset sequence through a source driver and a gate driver control display panel (as shown in step S702); and according to the second The light source is illuminated in a preset sequence during each screen display period, and the lighting time difference of each adjacent two-zone light source satisfies the following formula:

Where Δ T_ _{panel is} represented as a display period for each picture, and Δ T — _{backlight is} represented as a lighting time difference per adjacent two-area light source (as shown in step S704).

In summary, the method for solving the foregoing problems of the present invention is to shorten the lighting time difference of each adjacent two-zone light source, and according to the ratio of the value of Δ T_ _panel / N to the value of Δ T_ _backlight, the brightness uniformity of the screen is Experimental data of the influence of crosstalk interference to limit the lighting time difference of each adjacent two-area light source within the range defined by the above relationship to obtain better picture brightness uniformity and low crosstalk interference, thereby The stereoscopic image display device can provide better stereo image quality.

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.

1~k. . . Scanning line

200, 650. . . Scanning backlight module

212~220, 652~660. . . light source

280, 680. . . Light source driving circuit

600. . . Stereoscopic image display device

610. . . Display module

612. . . Timing controller

614. . . Source driver

616. . . Gate driver

618. . . Display panel

Frame_m, Frame_m+1. . . Picture

N. . . Number of light sources in the scanning backlight module

Δ T_ _panel . . . Screen display period

Δ T_ _backlight . . . Difference in lighting time between each adjacent two-zone light source

S402, S404, S702, S704. . . step

FIG. 1 is a diagram for explaining a driving sequence of a backlight module of a conventional stereoscopic image display device.

2 is a schematic diagram of a scanning backlight module according to an embodiment of the invention.

FIG. 3 is a view for explaining driving timings of the scanning backlight module of the present invention.

4 for explaining the ratio of the value of the value Δ T_ _panel / N and Δ T_ _backlight of the crosstalk with respect to the brightness of the screen uniformity.

FIG. 5 is a flow chart of a driving method of a scanning backlight module according to an embodiment of the invention.

FIG. 6 is a schematic diagram of a stereoscopic image display device according to an embodiment of the invention.

FIG. 7 is a flowchart of a display method of a stereoscopic image display device according to an embodiment of the invention.

1~k. . . Scanning line

Frame_m, Frame_m+1. . . Picture

Δ T_ _panel . . . Screen display period

Δ T_ _backlight . . . Difference in lighting time between each adjacent two-zone light source

Claims (10)

A scanning backlight module includes: an N-region light source, wherein N is a natural number, and N is greater than or equal to 3; and a light source driving circuit electrically connected to the N-region light source and configured to be in accordance with a predetermined sequence The light sources are illuminated during the display period, and the lighting time difference of each adjacent two-zone light source satisfies the following formula: Where Δ T_ _{panel is} represented as the display period of the picture, and Δ T — _{backlight is} expressed as the difference in lighting time of each adjacent two-area light source. The scanning backlight module of claim 1, wherein the adjacent two screen display periods are not overlapped, and the lighting time of the light source in any one of the previous screen display periods is not the same as the current The lighting time of the light source in any of the screen display periods overlaps. The scanning backlight module of claim 2, wherein the two screen display periods respectively display a left eye picture and a right eye picture. A stereoscopic image display device includes: a display module comprising: a display panel; a source driver electrically connected to the display panel; a gate driver electrically connected to the display panel; and a timing controller Connecting the source driver and the gate driver, and controlling the display panel to display a left eye image and a right eye image according to a first preset sequence through the source driver and the gate driver; and a scanning backlight The module includes: an N-region light source, wherein N is a natural number, and N is greater than or equal to 3; and a light source driving circuit electrically connecting the N-region light source and configured to be in each screen according to a second preset sequence The light sources are illuminated during the display period, and the lighting time difference of each adjacent two-zone light source satisfies the following formula: Where Δ T_ _{panel is} represented as a display period for each picture, and Δ T — _{backlight is} expressed as a difference in lighting time per adjacent two-area light source. The stereoscopic image display device of claim 4, wherein the right eye screen and the left eye screen are not overlapped during the screen display period, and the lighting time of the light source in any one of the previous screen display periods is It also does not overlap with the lighting time of the light source in any of the current screen display periods. A driving method of a scanning backlight module, wherein the scanning backlight module comprises an N-area light source, wherein N is a natural number, and N is greater than or equal to 3. The driving method comprises: defining each adjacent two-region light source The lighting time difference is satisfied, and the defined lighting time difference satisfies the following formula: Where Δ T_ _{panel is} indicated for each picture display period, and Δ T_ _{backlight is} represented as the lighting time difference of each adjacent two-area light source; and during each screen display according to a preset order and the defined lighting time difference The light sources are illuminated inside. The driving method according to claim 6, wherein the adjacent two screen display periods are not overlapped, and the lighting time of the light source in any one of the previous screen display periods is not the same as the current screen display period. The lighting time of the light source in any of the zones overlaps. The driving method of claim 7, wherein the two screen display periods respectively display a left eye picture and a right eye picture. A display device for a stereoscopic image display device includes a display module and a scanning backlight module. The display module further includes a display panel, a source driver and a gate driver. The source driver and the gate driver are electrically connected to the display panel, and the scan backlight module further includes an N-region light source, wherein N is a natural number and N is greater than or equal to 3. The display method includes: transmitting the The source driver and the gate driver control the display panel to display a left eye image and a right eye image according to a first preset sequence; and illuminate the display during each screen display period according to a second preset sequence The light source, and the lighting time difference of each adjacent two-zone light source satisfies the following formula: Where Δ T _ _{panel is} indicated for each picture display period, and Δ T _ _{backlight is} expressed as the lighting time difference of each adjacent two-area light source. The display method according to claim 9, wherein the right eye screen and the left eye screen are not overlapped during the screen display period, and the lighting time of the light source in any one of the previous screen display periods is not It overlaps with the lighting time of the light source in any of the current screen display periods.