CN102402934A - Scanning backlight module, driving method thereof, three-dimensional image display device and method - Google Patents

Abstract

A scanning backlight module, a stereoscopic image display device, a driving method of the scanning backlight module, and a display method of the stereoscopic image display device. The scanning backlight module includes N-zone light sources 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-zone light sources and is used to light up the light sources during a picture display period according to a preset sequence, and the lighting time difference between each two adjacent zone light sources satisfies the following formula:

ΔT_ _panel represents the display period of the image, and ΔT_ _backlight represents the lighting time difference between two adjacent light sources.

Description

Scanning backlight module and driving method thereof, stereoscopic image display device and method

technical field

The present invention relates to the technical field of 3D images, and in particular relates to a scanning backlight module, a 3D image display device, a driving method for a scanning type backlight module, and a display method for a 3D image display device. .

Background technique

FIG. 1 is used to illustrate the driving sequence of a backlight module of a conventional stereoscopic image display device. In FIG. 1 , the notation Frame_m represents the mth frame, and the notation Frame_m+1 represents the m+1th frame. Taking a stereoscopic image display device with k scan lines and a backlight module with 5 light sources as an example, in each frame display period _{ΔT_panel} , the lighting time difference between the light sources in each adjacent two areas is _{ΔT_backlight} , That is _{ΔT_panel} /5. In this way, it can be ensured that the scanning timing of the light source is consistent with the scanning timing of the scanning lines.

However, in actual conditions, even if the display panel of the stereoscopic image display device is divided into 5 areas to light up in the above-mentioned manner, the light emitted by each light source will still spread to other areas, and it is impossible to completely achieve only one point at a time. Brighten a single area. In this way, the brightness uniformity of the screen of the stereoscopic image display device will be poor, and the crosstalk of the image will also become larger.

Contents of the invention

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

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

The present invention proposes a scanning backlight module, which includes N-zone light sources 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 above-mentioned N-region light sources, and is used to light the above-mentioned light sources during a frame display period according to a preset sequence, and each two adjacent regions are used to display in a frame according to a preset sequence During this period, the above-mentioned light sources are turned on, and the time difference between the light sources in each adjacent two areas satisfies the following formula:

$0.5\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right)<\mathrm{\&Delta;}{T\_}_{\mathrm{backlight}}<0.9\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right),$ in

_{ΔT_panel} represents the above-mentioned screen display period, and _{ΔT_backlight} represents the lighting time difference between the light sources in each adjacent two areas.

Correspondingly, the present invention further proposes a driving method for a scanning backlight module. The scanning backlight module includes N-zone light sources, where N is a natural number, and N is greater than or equal to three. This driving method includes the following steps: define the lighting time difference of each adjacent two-zone light source, and the defined lighting time difference satisfies the following formula:

$0.5\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right)<\mathrm{\&Delta;}{T\_}_{\mathrm{backlight}}<0.9\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right),$ in

_{ΔT_panel} is represented as each screen display period, and _{ΔT_backlight} is represented as the lighting time difference of each adjacent two-zone light source; and according to a preset sequence and the defined lighting time difference, the above-mentioned light source.

The present invention further provides a stereoscopic image display device, which includes 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. Both 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 controls the display panel to display a left-eye frame and a right-eye frame according to a first preset sequence through the source driver and the gate driver. The above-mentioned scanning backlight module further includes N-zone light sources and a light source driving circuit, wherein N is a natural number, and N is greater than or equal to three. The light source driving circuit is electrically connected to the above-mentioned N-zone light sources, and is used to light up the above-mentioned light sources in each frame display period according to a second preset sequence, and the lighting time difference between each adjacent two-zone light sources satisfies the following formula:

$0.5\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right)<\mathrm{\&Delta;}{T\_}_{\mathrm{backlight}}<0.9\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right),$ in

_{ΔT_panel} represents the display period of each picture, and _{ΔT_backlight} represents the lighting time difference between the light sources of each adjacent two areas.

Correspondingly, the present invention also proposes 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 both the source driver and the gate driver are electrically connected to the display panel. The scanning backlight module further includes N-zone light sources, where N is a natural number, and N is greater than or equal to three. The display method includes the following steps: controlling the display panel to display a left-eye image and a right-eye image according to a first preset sequence through a source driver and a gate driver; and displaying a frame for each frame according to a second preset sequence Light up the above light sources, and the lighting time difference of each adjacent two-zone light source satisfies the following formula:

其中

in

_{ΔT_panel} represents the display period of each picture, and _{ΔT_backlight} represents the lighting time difference between the light sources of each adjacent two areas.

The means of the present invention to solve the aforementioned problems is to shorten the lighting time difference of the light sources in each adjacent two areas, and to test the influence of the ratio of the value of _{ΔT_panel} /N to the value of _{ΔT_backlight} on the uniformity of screen brightness and crosstalk interference data to limit the lighting time difference of each adjacent two-zone light source within the range defined by the above relational formula, so as to obtain better screen brightness uniformity and lower crosstalk interference, so that the stereoscopic image display device can provide more Excellent stereoscopic image quality.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

FIG. 1 is used to illustrate the driving sequence of a backlight module of a conventional stereoscopic image display device.

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

FIG. 3 is used to illustrate the driving sequence of the scanning backlight module of the present invention.

FIG. 4 is used to illustrate the influence of the ratio of the value of _{ΔT_panel} /N to the value of _{ΔT_backlight} on crosstalk interference and screen brightness uniformity.

FIG. 5 is a flowchart 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.

Explanation of reference signs

1～k: scan line

200, 650: scanning backlight module

212～220, 652～660: light source

280, 680: light source drive 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: Frame

N: the number of light sources in the scanning backlight module

ΔT_ _panel : During screen display

ΔT_ _backlight : the difference in lighting time of each adjacent two-zone light source

S402, S404, S702, S704: steps

Detailed ways

First embodiment:

FIG. 2 is a schematic diagram of a scanning backlight module according to an embodiment of the invention. The scanning backlight module 200 includes N area light sources and a light source driving circuit 280 , wherein N is a natural number, and N is greater than or equal to three. In this example, the scanning backlight module 200 uses 5-zone light sources (that is, N is 5), which are marked with 212-220 respectively. The light source driving circuit 280 is electrically connected to the above-mentioned 5-zone light sources, and is used to light the above-mentioned light sources during a frame display period according to a preset order (for example, from top to bottom), and the lighting of each adjacent two-zone light source The time difference satisfies the following formula:

$0.5\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right)<\mathrm{\&Delta;}{T\_}_{\mathrm{backlight}}<0.9\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right),$ in

_{ΔT_panel} represents the above-mentioned screen display period, and _{ΔT_backlight} represents the lighting time difference between the light sources in each adjacent two areas. The manner of obtaining the above formula will be described in detail later, and the driving sequence of the scanning backlight module of the present invention will be described first with FIG. 3 , please refer to FIG. 3 .

In FIG. 3, the mark Frame_m represents the mth frame (for example, a left-eye frame), and the mark Frame_m+1 represents the m+1-th frame (for example, a right-eye frame), and marks 1-k represent as For the scanning line of the stereoscopic image display device, the mark _{ΔT_panel} represents the display period of each frame, and the mark _{ΔT_backlight} represents the difference in lighting time between the light sources in two adjacent regions. Please refer to FIG. 3 and FIG. 1 at the same time. After comparison, it can be found that the lighting time difference _{ΔT_backlight} shown in FIG. 3 is shorter than the lighting time difference _{ΔT_backlight} shown in FIG. 1 . In addition, the lighting time difference _{ΔT_backlight} shown in FIG. 3 must also meet the specification defined by the aforementioned formula. It must be noted that in the driving sequence shown in FIG. 3 , the display periods of two adjacent frames do not overlap, and the light source in any region in the previous frame display period (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 area in the current frame display period (for example, the display period of the frame Frame_m+1).

The following will explain the definition of the above formula, please refer to the following table 1:

Table 1 is an experimental data of the present invention. In Table 1, the mark _{ΔT_panel} represents the display period of each picture, N represents the number of light sources in the scanning backlight module, and the mark _{ΔT_backlight} represents the number of each adjacent two areas. The lighting time of the light source is different. From Table 1, the influence of the ratio of the value of _{ΔT_panel} /N to the value of _{ΔT_backlight} on crosstalk interference and screen brightness uniformity can be obtained, as shown in FIG. 4 . In FIG. 4 , the symbols that are the same as those in Table 1 have the same meanings. It can be seen from FIG. 4 that to obtain better picture brightness uniformity and lower crosstalk interference so that the stereoscopic image display device can provide better stereoscopic image quality, the _{ΔT_backlight} (that is, the light source of each adjacent two areas The lighting time difference) is limited within the interval defined by the aforementioned formula. The above formula is listed again below.

$\mathrm{<span\; class="notranslate">\; 0.5</span>}<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; \&Delta;T</span>}<span\; class="notranslate">\; \_</span>}_{\mathrm{<span\; class="notranslate">\; panel</span>}}}{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; <</span>\mathrm{<span\; class="notranslate">\; \&Delta;</span>}{\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; \_</span>}_{\mathrm{<span\; class="notranslate">\; backlight</span>}}<span\; class="notranslate">\; <</span>\mathrm{<span\; class="notranslate">\; 0.9</span>}<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; \&Delta;T</span>}<span\; class="notranslate">\; \_</span>}_{\mathrm{<span\; class="notranslate">\; panel</span>}}}{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span>$

Based on the above description, those skilled in the art can summarize some basic operation steps of the scanning backlight module of the present invention, as shown in FIG. 5 . FIG. 5 is a flowchart of a driving method of a scanning backlight module according to an embodiment of the invention. The scanning backlight module includes N-zone light sources, where N is a natural number, and N is greater than or equal to three. Please refer to FIG. 5, this driving method includes the following steps: define the lighting time difference of each adjacent two-zone light source, and the defined lighting time difference satisfies the following formula:

$0.5\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right)<\mathrm{\&Delta;}{T\_}_{\mathrm{backlight}}<0.9\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right),$ in

_{ΔT_panel} is represented as each picture display period, and _{ΔT_backlight} is represented as the lighting time difference of each adjacent two-zone light sources (as shown in step S402); Turn on the above-mentioned light sources during the screen 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 scanning backlight module 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 . Both 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 through the source driver 614 and the gate driver 616 controls the display panel 618 to display the left-eye frame and the right-eye frame according to a first preset order. The scanning backlight module 650 further includes an N-zone light source and a light source driving circuit 680 , wherein N is a natural number, and N is greater than or equal to three. In this example, the scanning backlight module 650 uses 5-zone light sources (that is, N is 5), which are marked with 652-660 respectively. The light source driving circuit 680 is electrically connected to the above-mentioned 5-zone light sources, and is used to light the above-mentioned light sources during a frame display period according to a preset order (for example, from top to bottom), and the lighting of each adjacent two-zone light source The time difference satisfies the following formula:

$0.5\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right)<\mathrm{\&Delta;}{T\_}_{\mathrm{backlight}}<0.9\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right),$ in

_{ΔT_panel} represents the display period of each picture, and _{ΔT_backlight} represents the lighting time difference between the light sources of each adjacent two areas.

It is worth noting that, in the display mode of the stereoscopic image display device 600, the frame display periods of the right-eye frame and the left-eye frame do not overlap, and the lighting time of the light source in any region during the previous frame display period also does not overlap. It does not overlap with the lighting time of any area of the light source in the current picture display period, just like the way shown in FIG. 3 .

Based on the above description, those skilled in the art can summarize some basic operation steps of the stereoscopic image display device of the present invention, as shown in FIG. 7 . 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 both the source driver and the gate driver are electrically connected to the display panel. The scanning backlight module further includes N-zone light sources, where N is a natural number, and N is greater than or equal to three. Please refer to FIG. 7, the display method includes the following steps: controlling the display panel to display the left-eye picture and the right-eye picture according to the first preset order through the source driver and the gate driver (as shown in step S702); The above-mentioned light sources are turned on in each picture display period in a preset sequence, and the light-on time difference between the light sources in each adjacent two areas satisfies the following formula:

$0.5\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right)<\mathrm{\&Delta;}{T\_}_{\mathrm{backlight}}<0.9\left(\frac{{\mathrm{\&Delta;T}\_}_{\mathrm{panel}}}{N}\right),$ in

_{ΔT_panel} represents the display period of each picture, and _{ΔT_backlight} represents the lighting time difference between the light sources in each adjacent two areas (as shown in step S704).

To sum up, the means of the present invention to solve the foregoing problems is to shorten the lighting time difference of each adjacent two-zone light source, and to improve the picture brightness uniformity and crosstalk according to the ratio of the value of _{ΔT_panel} /N to the value of _{ΔT_backlight} According to the experimental data of the influence of interference, the lighting time difference of each adjacent two-zone light source is limited within the range defined by the above relational formula, so as to obtain better picture brightness uniformity and lower crosstalk interference, so that the stereoscopic image The display device can provide better stereoscopic image quality.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection is based on the claims.

Claims (10)

1. scanning backlight module comprises:

N district light source, wherein N is a natural number, and N is more than or equal to 3; And

One light source driving circuit electrically connects this N district light source, and in order to lighting those light sources according to a preset order in during a picture shows, and the mistiming of lighting of every adjacent two district's light sources is satisfied following formula:

$0.5\left(\frac{{\mathrm{\&Delta;\; T}\_}_{\mathrm{Panel}}}{N}\right)<\mathrm{\&Delta;}{T\_}_{\mathrm{Backlight}}<0.9\left(\frac{{\mathrm{\&Delta;\; T}\_}_{\mathrm{Panel}}}{N}\right),$ Wherein

Δ T_ _PanelBe expressed as during this picture demonstration, and Δ T_ _BacklightBe expressed as lighting the mistiming of every adjacent two district's light sources.

2. scanning backlight module as claimed in claim 1; It is characterized in that; During adjacent two pictures show is not overlapping, and last picture show during in time of lighting of light source in arbitrary district also do not show with present picture during in arbitrary district light source light time-interleaving.

3. scanning backlight module as claimed in claim 2 is characterized in that, is to show a left eye picture and a right eye picture respectively during these two pictures show.

4. holographic display device comprises:

One display module comprises:

One display panel;

The one source pole driver electrically connects this display panel;

One gate drivers electrically connects this display panel; And

Time schedule controller electrically connects this source electrode driver and this gate drivers, and shows a left eye picture and a right eye picture through this source electrode driver and this display panel of this gate drivers control according to one first preset order; And

One scan formula backlight module comprises:

N district light source, wherein N is a natural number, and N is more than or equal to 3; And

One light source driving circuit electrically connects this N district light source, and in order to lighting those light sources according to one second preset order in during each picture shows, and the mistiming of lighting of every adjacent two district's light sources is satisfied following formula:

$0.5\left(\frac{{\mathrm{\&Delta;\; T}\_}_{\mathrm{Panel}}}{N}\right)<\mathrm{\&Delta;}{T\_}_{\mathrm{Backlight}}<0.9\left(\frac{{\mathrm{\&Delta;\; T}\_}_{\mathrm{Panel}}}{N}\right),$ Wherein

Δ T_ _PanelBe expressed as during each picture demonstration, and Δ T_ _BacklightBe expressed as lighting the mistiming of every adjacent two district's light sources.

5. holographic display device as claimed in claim 4; It is characterized in that; The picture of this right eye picture and this left eye picture is not overlapping during showing, and last picture show during in time of lighting of light source in arbitrary district also do not show with present picture during in arbitrary district light source light time-interleaving.

6. the driving method of a scanning backlight module is characterized in that, described scanning backlight module includes N district light source, and wherein N is a natural number, and N is more than or equal to 3, and this driving method comprises:

Lighting the mistiming of the every adjacent two district's light sources of definition, and definedly light the mistiming and satisfy following formula:

$0.5\left(\frac{{\mathrm{\&Delta;\; T}\_}_{\mathrm{Panel}}}{N}\right)<\mathrm{\&Delta;}{T\_}_{\mathrm{Backlight}}<0.9\left(\frac{{\mathrm{\&Delta;\; T}\_}_{\mathrm{Panel}}}{N}\right),$ Wherein

Δ T_ _PanelBe expressed as during each picture demonstration, and Δ T_ _BacklightBe expressed as lighting the mistiming of every adjacent two district's light sources; And

Light the mistiming and light those light sources in during the demonstration of each picture with defined according to a preset order.

7. driving method as claimed in claim 6; It is characterized in that; During adjacent two pictures show is not overlapping, and last picture show during in time of lighting of light source in arbitrary district also do not show with present picture during in arbitrary district light source light time-interleaving.

8. driving method as claimed in claim 7 is characterized in that, is to show a left eye picture and a right eye picture respectively during these two pictures show.

9. the display packing of a holographic display device; Described holographic display device includes a display module and one scan formula backlight module, and this display module includes a display panel, one source pole driver and a gate drivers again, and this source electrode driver and this gate drivers all electrically connect this display panel; And this scanning backlight module includes N district light source; Wherein N is a natural number, and N is more than or equal to 3, and this display packing comprises:

See through this display panel of this source electrode driver and this gate drivers control and show a left eye picture and a right eye picture according to one first preset order; And

Light those light sources according to one second preset order in during each picture shows, and the mistiming of lighting of every adjacent two district's light sources is satisfied following formula:

$0.5\left(\frac{{\mathrm{\&Delta;\; T}\_}_{\mathrm{Panel}}}{N}\right)<\mathrm{\&Delta;}{T\_}_{\mathrm{Backlight}}<0.9\left(\frac{{\mathrm{\&Delta;\; T}\_}_{\mathrm{Panel}}}{N}\right),$ Wherein

Δ T_ _PanelBe expressed as during each picture demonstration, and Δ T_ _BacklightBe expressed as lighting the mistiming of every adjacent two district's light sources.

10. display packing as claimed in claim 9; It is characterized in that; The picture of this right eye picture and this left eye picture is not overlapping during showing, and last picture show during in time of lighting of light source in arbitrary district also do not show with present picture during in arbitrary district light source light time-interleaving.

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