JP6803201B2 - Light guide plate and backlight device including it - Google Patents

Description

The present invention relates to a light guide plate and a backlight device including a light guide plate.

3D display devices can be applied in various fields such as medical video, games, advertising, education, military and the like. Recently, 3D display devices provide the ability to switch between 3D display mode and 2D display mode. In connection with 3D displays, much research has been done to display 3D images using holography and stereoscopic techniques.

Stereoscopy technology is classified into a spectacles type that requires spectacles to provide images separated into both eyes of the user by polarized light and a shutter, and a naked eye type that does not require spectacles. The naked-eye type is also referred to as a naked-eye stereoscopic display, and a display device can directly separate images to realize a stereoscopic effect.

In a display device based on the naked eye system, a parallax barrier may be used to generate a 3D image using a stereo image. The parallax barrier includes vertical slits or diagonally arranged slits, which can provide separate 3D images to the user's left and right eyes to realize a stereoscopic effect.

An object of the present invention is to provide a light guide plate and a backlight device including a light guide plate.

The light guide plate according to the embodiment has a substrate that propagates at least one of the first light beam and the second light beam based on the total reflection effect, and a prism pattern for separating the first light beam from the substrate. And a linear pattern for separating the second light beam from the substrate.

In the light guide plate, the prism pattern may be arranged on the first surface of the substrate, and the linear pattern may be arranged on the second surface of the substrate.

In the light guide plate, the prism pattern may include a plurality of prism rows arranged on the first surface at intervals from each other.

In the light guide plate, the prism rows may be arranged in a structure parallel to the propagation direction of the first light beam, or may be arranged by rotating by an arbitrary angle with respect to the propagation direction of the first light beam. ..

In the light guide plate, the prism pattern can separate the first light beam from the outside of the substrate when the first light beam collides with any one of the prism rows.

In the light guide plate, each of the prism rows includes a plurality of prisms arranged back to back, and the prisms may be arranged back to back linearly or back to back in a zigzag pattern.

In the light guide plate, the linear pattern may include an array of grooves or protrusions.

In the light guide plate, the grooves or protrusions are regularly or irregularly arranged on the lower surface of the substrate, or arranged perpendicular to the propagation direction of the second light beam, or the second light beam. It can be arranged so as to have an arbitrary angle with respect to the propagation direction.

In the light guide plate, the linear pattern can cause the second light beam to escape to the outside of the substrate when the second light beam collides with any one of the grooves or protrusions.

The backlight device includes the light guide plate including a prism pattern for separating the first light beam and a linear pattern for separating the second light beam, and the second light device when the backlight device operates in the 3D display mode. A first illumination unit that emits one light beam toward the light guide plate, and a second illumination unit that emits the second light beam toward the light guide plate when the backlight device operates in the 2D display mode. The light redirecting film arranged on the upper part of the light guide plate and the reflective film arranged on the lower part of the light guide plate are included.

In the backlight device, in the 3D display mode, power is applied to the first lighting unit to power off the second lighting unit, and in the 2D display mode, power is applied to the second lighting unit. The first lighting unit can be powered off.

In the backlight device, the first illumination unit forms the first light beam that emits the first light in the 3D display mode and the first light beam based on the first light, and forms the first light beam. It may include a first light conversion unit incident on the light guide plate.

In the backlight device, the second illumination unit forms the second light beam by adjusting the second light source that emits the second light in the 2D display mode and the second light, and the second light beam. Can include a second light conversion unit that causes the light source to enter the light guide plate.

In the backlight device, the light redirection film may direct the detached first light beam so that the first light beam detached from the light guide plate is directed toward the viewer in the 3D display mode.

In the backlight device, the reflective film can reflect the second light beam detached from the light guide plate in the 2D display mode to change the angular distribution.

The backlighting apparatus may further include a Fresnel lens film for concentrating the first or second light beam emitted from the light redirection film on the region where the viewer is located.

According to the present invention, the thickness of the backlight device can be reduced by using one light guide plate for the 3D display mode and the 2D display mode.

Also, by using one or more light sources for each of the 3D display mode and the 2D display mode, the conversion between the 3D display mode and the 2D display mode can be easily performed.

The perspective view of the 3D / 2D display mode switching type backlight apparatus which concerns on one Embodiment is shown. The top view of the light guide plate provided with the prism pattern and the linear pattern which concerns on one Embodiment is shown. The bottom view of the light guide plate provided with the prism pattern and the linear pattern which concerns on one Embodiment is shown. An example of a prism pattern arranged in various forms according to one embodiment is shown. An example of a prism pattern arranged in various forms according to one embodiment is shown. An example of a prism pattern arranged in various forms according to one embodiment is shown. An example of a prism pattern arranged in various forms according to one embodiment is shown. One prism included in the prism pattern according to one embodiment is shown. One prism included in the prism pattern according to one embodiment is shown. A cross-sectional view of one linear groove or protrusion included in a linear pattern provided on the lower surface of the light guide plate according to the embodiment is shown. A cross-sectional view of a backlight device based on one light guide plate operating in the 3D display mode according to the embodiment is shown. An example of the first illumination unit used in the 3D display mode according to the embodiment is shown. The cross-sectional view of the illumination part used in the 3D display mode which concerns on one Embodiment is shown. The cross-sectional view of the illumination part used in the 3D display mode which concerns on one Embodiment is shown. A collimator included in a collimation array that is a part of the illumination unit according to the embodiment is shown. A cross-sectional view of a backlight device based on one light guide plate operating in a 2D display mode according to an embodiment is shown. A display device including a display panel, a backlight device, and a controller according to an embodiment is shown. The controller according to one embodiment is shown.

The following specific structural or functional description is provided merely for the purpose of explaining embodiments and is to be construed as limiting the scope of the patent application to the content described herein. There is nothing.

Although terms such as first or second can be used to distinguish between multiple components, the components should not be construed as being limited by the first or second term. Also, the terms used in the embodiments are used merely to describe a particular embodiment and are not intended to limit the embodiments. A singular expression includes multiple expressions unless they are meant to be explicitly different in context.

In the present specification, terms such as "including" or "having" are used to specify the existence of features, numbers, steps, processes, components, parts or combinations thereof described in the specification. It must be understood as not prescribing the existence or addability of one or more other features or numbers, steps, processes, components, parts or combinations thereof.

Unless defined differently, all terms used herein, including technical or scientific terms, are generally understood by those with ordinary knowledge in the technical field to which this embodiment belongs. Has the same meaning as. Commonly used predefined terms should be construed to have meanings consistent with those in the context of the relevant art, ideally or excessively unless expressly defined herein. It is not interpreted as a formal meaning.

Also, directional terms such as "upper", "lower", "front", "rear", "side" are used with reference to the orientation of the drawings described. The components of the embodiment may be arranged in different orientations and are not construed as limiting the scope of the embodiment by the directional terms described above.

The following embodiments relate to a light guide plate and a backlight device including a light guide plate that provides a conversion function between a 3D display mode and a 2D display mode. The backlight device provides lighting for the 3D display mode and lighting for the 2D display mode to the display device (not shown) including the backlight device. Here, the 3D display mode is a mode for displaying a 3D image, and the 2D display mode is a mode for displaying a 2D image.

Hereinafter, the description will be described in detail with reference to the drawings to which the embodiments are attached. In the description with reference to the accompanying drawings, the same components are given the same reference numerals regardless of the drawing reference numerals, and duplicate description thereof will be omitted.

FIG. 1 shows a perspective view of a 3D / 2D display mode switching type backlight device 100 according to an embodiment. Referring to FIG. 1, the backlight device 100 includes a substrate 110, a first illumination unit 120, a second illumination unit 130, an optical redirection film 140, and a reflective film 150. It will be apparent to those skilled in the art of the art that the scope of the embodiment is not limited by the number of components shown in FIG. 1, and the number of components of the backlight device 100 may vary from embodiment to embodiment. .. For example, the backlight device 100 may include two or more first illumination unit 120, second illumination unit 130, light redirection film 140, or reflection film 150 depending on the embodiment. According to the embodiment, the backlight device 100 may use one substrate 110 in order to reduce the thickness of the backlight device 100.

In the embodiment shown in FIG. 1, the first illumination unit 120 is used in a 3D display mode and includes one or more light sources 121 and one or more light conversion units 122. The second illumination unit 130 is used in a 2D display mode and includes one or more light sources 131 and one or more light conversion units 132. The first illumination unit 120 radiates the first light beam toward either the front surface or the rear surface of the substrate 110, and the second illumination unit 130 emits the second light beam toward one or more of the side surfaces of the substrate 110. Can be radiated towards the sides of.

Since the first illumination unit 120 and the second illumination unit 130 are used in the 3D display mode and the 2D display mode, respectively, they are emitted from the first light beam emitted from the first illumination unit 120 and the second illumination unit 130. The second light beams have different angular distributions from each other. As will be described in more detail below, the substrate 110 has a prism pattern 111 arranged on the upper surface thereof and a linear pattern 112 arranged on the lower surface surface of the substrate 110. The prism pattern 111 is for extracting the first light beam in the 3D display mode, and the linear pattern 112 is for extracting the second light beam in the 2D display mode. The term "light guide plate (LGP)" described herein means a coupling between a substrate 110 and a prism pattern 111 and a linear pattern 112. The optical redirection film 140 is arranged above the substrate 110, and the reflective film 150 is arranged below the substrate 110.

The light source 121 may be embodied by one or more light emitting diodes (LEDs), laser diodes, or lamps or a combination thereof. According to one embodiment, the light source 121 is embodied by one or more light emitting diodes that emit unpolarized, unpolarized light or one or more laser diodes that emit polarized, highly collimated light. .. The light conversion unit 122 performs functions such as angle conversion, homogenization, and collimation with respect to the light emitted by the light source 121, and causes the light converted as the first light beam to enter the substrate 110.

The light source 131 may also be embodied by one or more light emitting diodes or lamps that emit unpolarized light that is not collimated, one or more laser diodes that emit polarized highly collimated light, or a combination thereof. .. The light conversion unit 132 also performs functions such as angle conversion, homogenization, and collimation of the light emitted by the light source 131, and causes the light converted as the second light beam to enter the substrate 110.

According to other embodiments, the backlighting apparatus 100 may further include a Fresnel lens film 160. In this case, the Fresnel lens film 160 is arranged above the optical redirection film 140. According to the embodiment, the Fresnel lens film 160 has a radial structure or a cylindrical structure.

The light redirection film 140 is radiated by the first illumination unit 120, and the first light beam separated from the outside of the substrate 110 by the prism pattern 111 can be redirected toward the upper surface of the Fresnel lens film 160 or the viewer. .. The Fresnel lens film 160 is used to focus the first light beam emitted from the light redirection film 140 in the 3D display mode within the region where the viewer is located. In 2D display mode, the Fresnel lens film 160 is used to focus the second light beam emitted from the light redirection film 140 within the region where the viewer is located.

The reflective film 150 reflects the second light beam detached from the outside of the substrate 110 by the linear pattern 112, and the second light beam passes through the substrate 110 and the optical redirection film 140 (up to the Fresnel lens film 160 depending on the embodiment). The angle distribution of the second light beam can be changed so as to be directed toward the viewer.

The conversion between the 3D display mode and the 2D display mode is recognized by the conversion between the first illumination unit 120 and the second illumination unit 130. In the 3D display mode, power is applied to the light source 121 of the first illumination unit 120, while the light source 131 of the second illumination unit 130 is powered off. On the contrary, in the 2D display mode, the light source 121 of the first illumination unit 120 is powered off, and the power is applied to the light source 131 of the second illumination unit 130.

The first light beam and the second light beam are propagated in the substrate 110 of the backlight device 100 based on the total reflection effect. In the following, the light guide plate will be described with reference to FIGS. 2A and 2B. As already described above, the light guide plate includes a substrate 110, a prism pattern 111 arranged on the upper surface of the substrate 110, and a linear pattern 112 arranged on the lower surface of the substrate 110. The substrate 110, the prism pattern 111, and the linear pattern 112 can be formed of PMMA (polymethyl methylate), glass, other optically transparent material, or a combination thereof. Further, depending on the embodiment, the substrate 110, the prism pattern 111, and the linear pattern 112 are formed by one structure.

FIG. 2A shows a prism pattern 111 according to an embodiment. The prism pattern 111 partially separates the first light beam incident on the inside of the substrate 110 from the outside of the substrate 110 in the 3D display mode so that the first light beam is directed toward the optical redirection film 140. The prism pattern 111 includes prism rows 210 that are spaced apart from each other. Each prism row 210 includes back-to-back prisms 211.

The first light beam emitted from the light source 121 of the first illumination unit 120 is incident on the front surface of the substrate 110. The upper and lower surfaces of the substrate 110 are optically polished. The prism rows 210 may be spaced apart on the top surface of the substrate 110 by unpatterned regions 212. If the first light beam radiated from the light source 121 and incident on the substrate 110 hits the unpatterned region 212, the first light beam can be continuously propagated inside the substrate 110 due to the total internal reflection effect. If the first light beam radiated from the light source 121 and incident on the substrate 110 collides with the prism row 210, the condition of total reflection is not satisfied and the first light beam is partially separated from the outside of the substrate 110.

When the prism row 210 functions as a linear slit like a slit in a parallax barrier, the first light beam detached from the substrate 110 by the prism row 210 forms an illumination having a stereoscopic display effect. Since the first light beam that hits the unpatterned region 212 stays in the substrate 110 due to the total reflection effect, the unpatterned region 212 functions like a parallax barrier. The prism pattern 111 can be formed on the upper surface of the substrate 110 by, for example, etching, printing, adhesion, molding, cutting, or a combination thereof.

3A to 3D are diagrams showing an example of prism patterns 111 arranged in various forms according to one embodiment. As shown in FIG. 3A, the prism train 210 included in the prism pattern 111 is arranged in a structure parallel to the propagation direction of the first light beam emitted from the light source 121, or is shown in FIGS. 3B to 3D. As described above, it can be arranged in a structure rotated by an arbitrary angle with respect to the propagation direction of the first light beam.

Each prism 211 included in the prism row 210 of the prism pattern 111 is directed in the same direction as the propagation direction of the first light beam, as shown in FIGS. 3A and 3C, or is shown in FIGS. 3B and 3D. As described above, the prism pattern 111 is rotated by an arbitrary angle according to the direction of the basic columns. Further, the prisms 211 included in the prism row 210 are arranged linearly back to back as shown in FIGS. 3A, 3B, and 3D, or form zigzag lines as shown in FIG. 3C. Can be placed in a form.

The prism pattern 111 can be defined by key parameters such as the spacing 310 between the prism rows 210 and the width 320 of each prism row 210. The interval 310 determines the image quality of the stereoscopic image (eg, resolution or number of viewpoints of the image) achieved by the image generation algorithm, image generation and lighting processing. Generally, the interval 310 is constant but can vary depending on the requirements of the algorithm. The width 320 can be determined based on the width between the linear light sources that illuminate the panel image generated by the image generation algorithm. Generally, the value of width 320 is constant, but can vary as needed to improve algorithmic requirements or efficiency and uniformity for light extraction from substrate 110. For example, when the width 320 has a non-constant value, the width 320 increases from the front surface of the substrate 110 toward the rear surface according to the directions shown in FIGS. 3A to 3D.

4A and 4B are diagrams showing each prism 211 included in the prism pattern 111 according to the embodiment.

The width 320 of each prism row 210 may vary continuously or discretely from prism to prism depending on the requirements of the applied algorithm, the distribution of prism rows 210, and the production technique. The width 320 is defined by the width 410 of each prism 211 arranged in the prism train 210. The main parameters of the prism 211 are defined for the first light beam to detach from the substrate 110 with high efficiency and uniformity without significant degradation of essential optical parameters such as angular distribution.

The value of the width 410 is constant for each prism 211, as shown in FIG. 4A, or is not constant such that it has different start and end values 4101 and 4102, depending on the embodiment, as shown in FIG. 4B. .. The width 410 defines the amount of the first light beam passing through the lower surface 411 of each prism 211, and here, based on this, the total reflection condition is broken on the surface 412 of the prism 211 and the first light beam is separated from the substrate 110. The amount of is defined. Since the total reflection condition is broken, the surface 412 can be directed at an angle larger than the total reflection angle between the first light beam propagating inside the substrate 110 and the surface 412. The angular position of the surface 412 is defined by the first base angle 413 selected by the parameters of the first illumination unit 120 and the propagation parameters for the first light beam inside the substrate 110. Generally, the angular structure of the prism surface of the optical redirection film 140 used to accurately redirect the first light beam detached from the first base angle 413 and the substrate 110 to the region where the viewer is located. May be defined by.

The second base angle 414 is defined as a value for obtaining a uniform vertical angle distribution with respect to the detached first light beam after the first light beam has passed through the surface 412. The prism length 415 may be selected as a value to provide a high quality uniform line for the detached first light beam. If the prism rows 210 in the prism pattern 111 have a zigzag shape, the prism length 415 can be additionally defined depending on the structure of the photoredirected film 140, the configuration of the display panel, and the algorithmic requirements.

In the embodiments described above with reference to FIGS. 3B and 3D, the prism 211 compensates for possible light deviations due to the angle 416 of the prism 211 rather than the guide being perpendicular to the side surface of the prism. It can be embodied as a prism in a form modified to have an angle to do so. Other parameters such as the upper angle 417 and the prism height 418 have values defined based on the first base angle 413, the second base angle 414, and the prism length 415.

The parameters of the prism 211 relate to the characteristics of the first light radiated from the light source 121 and propagated inside the substrate 110.

Explaining again with reference to FIG. 2B, FIG. 2B shows a linear pattern 112 according to an embodiment. Referring to FIG. 2B, the linear pattern 112 is provided on the underside of the substrate 110 and includes an array of linear grooves or protrusions 220. The linear pattern 112 can be formed on the underside of the substrate 110, for example by etching, printing or a combination thereof.

In 2D display mode, the second light beam is emitted from a second light source 131 of the second illumination unit 130 and incident on one or more sides of the substrate 110. When the second light beam hits each linear groove or protrusion 220 formed on the lower surface of the substrate 110, the second light beam is partially detached from the substrate 110 by the linear pattern 112. The second light beam partially detached from the substrate 110 by the linear pattern 112 heads towards the reflective film 150. Similar to the first light beam in 3D display mode, when the second light beam hits the unpatterned region 221 between the grooves or protrusions 220, the total reflection conditions remain unchanged and the second light beam is on substrate 110. Can be propagated continuously within.

FIG. 5 shows a cross-sectional view of one linear groove or protrusion 220 according to an embodiment. The linear pattern 112 is characterized according to parameters such as the spacing between the linear grooves or protrusions 220, the width 510, height 520, and length 530 of each linear groove or protrusion 220. The spacing between the linear grooves or protrusions 220 is constant or variable. According to one embodiment, the spacing between the linear grooves or protrusions 220 has a value to provide uniform illumination. The width 510 and height 520 of each linear groove or protrusion 220 in the linear pattern 112 also has a constant value or is variable. When the width 510 and the height 520 are variable, the width 510 and the height 520 are determined by the length 530 so that the second light beam is uniformly extracted as a whole of the substrate 110. Also, the spacing between the linear grooves or protrusions 220, the values of width 510 and height 520 may vary linearly or chaotically, or by other suitable methods. According to the embodiment, each groove and the protrusion 220 of the linear pattern 112 are arranged so as to be perpendicular to the propagation direction of the second light beam or to have an arbitrary angle with respect to the propagation direction of the second light beam. obtain.

FIG. 6 is a cross-sectional view of a backlight device based on one light guide plate operating in the 3D display mode according to the embodiment, and is a diagram for explaining a functional design for lighting in the 3D display mode.

Referring to FIG. 6, the first illumination unit 120 is located close to the substrate 110 so that the first light beam emitted from the light source 121 passes through the light conversion unit 122 and then is incident on the substrate 110. When the light source 121 is embodied in one or more light emitting diodes, the light converter 122 is collimated by a collimation array 123, a collimation array 123 for collimating the light of the light emitting diodes using the total internal reflection effect. The homogenizing film 124 for homogenizing the emitted light, the Bezel zone component to make the light extraction from the substrate 110 more uniform and efficient, and the additional light mixing as a light redirection are provided. Includes a reoriented cube 125 for. 7 and 8A to 8C are views of the optical conversion unit 122 according to one embodiment observed from another viewpoint. As already described above, the light emitted from the first illumination unit 120 is incident on the substrate 110 as the first light beam.

The collimation array 123 is a sequence of collimators separated or integrated with respect to each light source 121 included in the array of light sources 121, or light collimated with uncoordinated light in a point distribution having no other structure. It can be embodied in other configurations that perform the function of transforming into a uniform spatial distribution of.

The homogenizing film 124 converts the input angular distribution of light into the angular distribution required for incident on the substrate 110 and illumination. The homogenizing film 124 provides light diffusion to one or more of a lenticular film having a micro-cylindrical pattern, a micro-spherical pattern film having a concave lens and a convex lens array, a vertical axis and a horizontal axis. It can be embodied as a light-shaping diffuser (LSD), or another film that has a different structure but performs the same function as manipulating light by changing the direction of light energy.

The redirection cube 125 can separate several light incident on the redirection cube 125 in several mutually dependent directions so that light extraction from the substrate 110 can be performed more uniformly and efficiently. The reoriented cube 125 has the same function as a cube having a symmetric prism structure or an asymmetric prism structure, or a structure having such a structure but separating light in several mutually dependent directions to adjust the light. It can be embodied as another cube to have. The reoriented cube 125 has an increased length depending on the direction of light propagation to behave similarly to the bezel region component.

8A and 8B show a top view and a side view of the optical conversion unit 122 according to each embodiment. With reference to FIGS. 8A and 8B, the non-collimated light emitted from the regularly arranged light sources 121 is refracted at the front of each collimator contained in the collimation array 123 and incident on the collimator. To. Light incident on each collimator can be collimated by a total internal reflection effect on the side surface 1231 for horizontal collimation and the bottom surface 1232 for vertical collimation. The cylindrical surface 1233 provides additional horizontal collimation to compensate for the length of the collimation array 123.

Light collimated by the collimation array 123 passes through a homogenizing film 124 embodied as a lenticular film having a vertically microcylindrical surface 1241. The parameters of the homogenized film 124 are selected based on the characteristics of the fundamental angle with respect to the input light and the required output light.

The distribution of the light emitted from the homogenizing film 124 is adjusted by the reoriented cube 125 having a symmetrical microprism surface 1251. The microprism surface 1251 includes elongated microprisms that are regularly arranged in the vertical direction. Light is refracted at the surface 1251 of the microprism with additional angular displacement and passes through the redirectional cube 125. The vertical and horizontal sizes of all the components included in the light converter 122 are defined based on the size of the light source 121 and the area of the front surface of the substrate 110 illuminated by the light source 121. All components of the light converter 122 are placed back to back with no spacing or with short spacing from each other to reduce the overall thickness of the first illumination unit 120.

FIG. 8C is a diagram showing one collimator included in the collimation array 123 according to the embodiment. With reference to FIG. 8C, the first horizontal width 1234 of the collimator is selected based on the horizontal dimension of one illuminated area illuminated by the light source 121. Similarly, the vertical height 1235 of the collimator is also selected based on the vertical dimension of one illuminated area illuminated by the light source 121. The second horizontal width 1236 of the collimator is defined based on the number of light sources included in the array of light sources 121 and the spacing between the light sources 121 calculated by the dimensions of the front surface of the substrate 110 illuminated by the light sources 121. To. The first length 1237 of the collimator is defined by a method for providing a wide angular distribution in the process of fully collimating uncoordinated light. Generally, the first length 1237 is determined based on conditions for providing a uniform spatial distribution and a uniform angular distribution of collimated light. The second length 1238 of the collimator is defined based on general requirements and manufacturability for collimation length. The radius 1239 with respect to the cylindrical surface 1233 may have a value suitable for obtaining a component having sufficient focal length for additional collimation. Depending on the embodiment, all parameter values for each collimator included in the collimation array 123 vary, and the designs shown in FIGS. 8A-8C are merely examples of collimator parameter values. Can be modified to achieve the same output light characteristics.

Proper realization of the light converter 122 enables efficient and uniform light extraction for high quality illumination in 3D display mode, the angular distribution of light and the spatial space of light required to be incident on the substrate 110. Allows distribution.

Referring to FIG. 6 again, the first light beam separated from the substrate 110 by the prism pattern 111 reaches the optical redirection film 140 arranged on the upper part of the substrate 110. The light redirection film 140 can reorient the first light beam. The optical redirection film 140 is embodied as a film having a prism structure 141 on the lower surface. Here, the prism structure 141 can redirect the first light beam based on the total reflection effect. The first light beam detached from the substrate 110 by the prism pattern 111 reaches one or more side surfaces of each prism included in the prism structure 141. After the first light beam is refracted at one or more sides of each prism included in the prism structure 141, the first light beam hits the opposite side. After that, the first light beam passes through the rest of the light redirection film 140 and generally reaches the upper surface of the light redirection film 140. The optical redirection film 140 may also have other structures, but is embodied by an optical film having the same function.

After passing through the light redirection film 140, the first light beam is propagated by the Fresnel lens structure 161 provided on the lower surface of the Fresnel lens film 160. The Fresnel lens film 160 may be used to concentrate the first light beam incident from the light redirection film 140 in the 3D display mode on the region where the viewer is located. In the 2D display mode, the Fresnel lens film 160 may be used to focus the second light beam incident from the optical redirection film 140 on the region where the viewer is located. A Fresnel lens is defined by parameters such as radius or curvature, which are the areas in which the viewer is located in the direction of the first or second light beam towards the viewer located at a specific distance from the display. Selected as a value to focus on.

FIG. 9 is a cross-sectional view of a backlight device based on one light guide plate operating in the 2D display mode according to the embodiment, and is a diagram for explaining a functional design for lighting in the 2D display mode. As shown in FIG. 9, the second illumination unit 130 is arranged on the side surface of the substrate 110 so that the light radiated from the light source 131 can be incident on the substrate 110. Depending on the embodiment, the second lighting unit 130 is composed of one lighting unit or a plurality of lighting units.

As described above, the second illumination unit 130 includes a light source 131 and a light conversion unit 132. Since the light conversion unit 132 operates like a bezel region component, it may have an increased length depending on the light propagation direction. The light emitted from the light source 131 passes through the light conversion unit 132, and the light whose angle is converted by the light conversion unit 132 is incident on the substrate 110 as a second light beam via the side surface of the substrate 110. The second light beam can be propagated inside the substrate 110 like a waveguide.

The second light beam separated from the substrate 110 by the linear pattern 112 can reach the reflective film 150 by being directed in the normal direction and the distant direction with the angular divergence calculated in advance. The reflective film 150 can reflect the second light beam and change the angular distribution of the second light beam. The second light beam passes through the light redirection film 140 and generally goes to the upper surface of the Fresnel lens film 160. The reflective film 150 is a film in which a reflective micro / spherical convex lens or a concave lens is patterned, a film in which a micro-pyramid lens is patterned, a reflective diffuser having a Lambert angle distribution, and a structure is different. It can be embodied as a reflective film that provides the same function, or an aggregate of films that have the same function. The second light beam incident on the surface 151 of the reflective film 150 is reflected upward with a varied light angle distribution to pass through the light reoriented film 140.

Thereby, the embodiments described above can provide a uniform light distribution and a sufficient light angle distribution for LCD illumination with a wide field of view in 2D display mode. The features described above can be achieved by a linear pattern 112 provided on the underside of the substrate 110.

In summary, the embodiment provides a backlighting apparatus 100 that can be switched between a 3D display mode and a 2D display mode. When the 3D display mode is selected, power is applied to the first illumination unit 120 and the second illumination unit 130 is powered off. Then, the first light beam separated from the substrate 110 by the prism pattern 111 is directed toward the viewer by the optical redirection film 140. When the 2D display mode is selected, the first illumination unit 120 is powered off and power is applied to the second illumination unit 130. Then, the second light beam separated from the substrate 110 by the linear pattern 112 is reflected by the reflective film 150 to change the angular distribution, and is directed toward the viewer through the substrate 110 and the optical redirection film 140. To.

According to the embodiment, the thickness of the backlight device can be reduced by using one light guide plate for the 3D display mode and the 2D display mode. Also, by using one or more light sources for each of the 3D display mode and the 2D display mode, it is possible to easily switch between the 3D display mode and the 2D display mode.

FIG. 10 shows a display device including a display panel, a backlight device, and a controller according to an embodiment. FIG. 11 shows a controller according to an embodiment.

With reference to FIGS. 10 and 11, the display device 1000 includes a display panel 1010, a backlight device 1020, and a controller 1030.

The backlight device 1020 can be the backlight device 100 shown in FIG. The backlight device 1020 is arranged below or behind the display panel 1010 to provide light for outputting video data to the display panel 1010. The display panel 1010 may be a liquid crystal crystal display (LCD) panel in which the subpixels are arranged in a matrix and function based on the light provided by the backlighting apparatus 1020.

The controller 1030 controls the display panel 1010 and the backlight device 1020. For example, the controller 1030 controls the backlight device 1020 to enter a first mode or a second mode, for example, based on the type of video data. According to one embodiment, the first mode may be a 3D display mode and the second mode may be a 2D display mode.

As shown in FIG. 11, controller 1030 includes interface 1031, memory 1032, processor 1033, power supply 1034, and data bus 1035.

Interface 1031, memory 1032, and processor 1033 use the data bus 1035 to exchange data with other components. Further, the interface 1031, the memory 1032, and the processor 1033 are supplied with electric power from the power supply device 1034.

Interface 1031 includes a transmitter and / or a receiver. The transmitter includes, for example, software and hardware necessary to transmit a signal including a data signal and / or a control signal. The receiver includes software and hardware necessary to receive signals including data signals and / or control signals.

The memory 1032 stores an operation result of the processor 1033 and an instruction for executing one or more operations described above. The memory can be, for example, a non-volatile memory, a volatile memory, a hard disk, an optical disk, or a combination thereof.

The processor 1033 executes an instruction for controlling the display panel 1010 and the backlight device 1020. For example, the processor 1033 determines the type of video data received by the interface 1031 and operates the backlight device 1020 as either of the 3D display mode and the 2D display mode based on the determined video data type. To decide. Here, the type of video data can be 3D video data or 2D video data. For example, the processor 1033 controls the backlight device 100 to activate the first illumination unit 120 and inactivate the second illumination unit 130 to enter the 3D display mode. The processor 1033 also controls the backlight device 100 to inactivate the first illuminating unit 120 and activate the second illuminating unit 130 in order to enter the 2D display mode.

Therefore, the controller 1030 is supplied with power to the first lighting unit 120, the power is cut off from the second lighting unit 130, and the first light beam is separated from the substrate 110 by the prism pattern 111 in the 3D display mode and the first lighting unit. The display mode of the backlight device 1020 can be switched among the 2D display modes in which power is cut off to 120, power is supplied to the second illumination unit 130, and the second light beam is separated from the substrate 110 by the linear pattern 112.

Although the embodiments have been described above with limited drawings, any person with normal knowledge in the art of the art may apply various technical modifications and modifications based on the above. it can. For example, the techniques described may be performed in a different order than the methods described, and / or components such as systems, structures, devices, circuits described may be combined or combined in a manner different from the methods described. Appropriate results can be achieved even if they are replaced or replaced by other components or equivalents.

100: Backlight device 110: Substrate 120: First illumination unit 130: Second illumination unit 140: Light redirection film 150: Reflective film

Claims (26)

A substrate that propagates at least one of the first and second light beams based on the total internal reflection effect.
A prism pattern for separating the first light beam from the substrate, and
A linear pattern for separating the second light beam from the substrate, and
Only including, the prism pattern comprises a plurality of elongated prisms that are arranged at spaced intervals, each prism row includes a plurality of prisms, the light guide plate. The prism pattern is arranged on the first surface of the substrate.
The light guide plate according to claim 1, wherein the linear pattern is arranged on the second surface of the substrate. The light guide plate according to claim 2, wherein the prism pattern includes a plurality of prism rows arranged on the first surface at intervals from each other. Claimed that the prism trains are arranged in a structure parallel to the propagation direction of the first light beam, or rotated by an arbitrary angle with respect to the propagation direction of the first light beam. The light guide plate according to 3. The induction according to claim 3 or 4, wherein the prism pattern separates the first light beam from the outside of the substrate when the first light beam irradiates any one of the prism rows. Light plate. Before SL prisms, either linearly arranged on the first surface, or the are arranged in a zigzag pattern on the first surface, the light guide plate according to claim 3. The light guide plate according to any one of claims 1 to 6, wherein the linear pattern includes an array of grooves or protrusions. The light guide plate according to claim 7, wherein the grooves or protrusions are regularly or irregularly arranged on the lower surface of the substrate. The groove or the protrusion is arranged perpendicular to the propagation direction of the second light beam, or is arranged so as to have an arbitrary angle with respect to the propagation direction of the second light beam. 7. The light guide plate according to 7. The linear pattern according to claims 7 to 9, wherein when the second light beam is applied to any one of the grooves or the protrusions, the second light beam is separated from the outside of the substrate. The light guide plate according to any one of the items. The light guide plate operates in 3D display mode or 2D display mode.
The first light beam is incident on any one of the front surface and the rear surface of the substrate in the 3D display mode.
The second light beam is incident on at least one of the side surfaces of the substrate in the 2D display mode.
The light guide plate according to any one of claims 1 to 10, wherein the first light beam and the second light beam have different angular distributions from each other. The light guide plate according to any one of claims 1 to 11, wherein the substrate, the prism pattern, and the linear pattern are formed of one structure. It is a backlight device
A light guide plate including a prism pattern for separating the first light beam and a linear pattern for separating the second light beam,
When the backlight device operates in the 3D display mode, the first illumination unit that radiates the first light beam toward the light guide plate and the first illumination unit.
When the backlight device operates in the 2D display mode, the second illumination unit that radiates the second light beam toward the light guide plate and the second illumination unit.
An optical redirection film arranged on the upper part of the light guide plate and
A reflective film placed under the light guide plate and
Only including, the prism pattern comprises a plurality of elongated prisms that are arranged at spaced intervals, each prism row includes a plurality of prisms, the backlight device. The light guide plate includes a substrate that internally propagates at least one of the first light beam and the second light beam based on the total reflection effect.
The prism pattern is arranged on the upper surface of the substrate and is arranged.
The backlight device according to claim 13, wherein the linear pattern is arranged on the lower surface of the substrate. The first illumination unit radiates the first light beam toward any one of the front surface and the rear surface of the light guide plate.
The second illumination unit radiates the second light beam toward at least one side surface of the light guide plate.
The backlight device according to claim 13 or 14, wherein the first light beam and the second light beam have different angular distributions from each other. In the 3D display mode, a power source is applied to the first lighting unit to power off the second lighting unit.
The backlight device according to any one of claims 13 to 15, wherein in the 2D display mode, a power source is applied to the second lighting unit to power off the first lighting unit. The first lighting unit is
The first light source that emits the first light in the 3D display mode and
A first light conversion unit that forms the first light beam based on the first light and causes the first light beam to enter the light guide plate.
The backlight device according to any one of claims 13 to 16, comprising the above. The backlight device according to claim 17, wherein the first light conversion unit performs at least one of angle conversion, homogenization, and collimation with respect to the first light. The first optical converter includes a collimation array, a homogenizing film and a reoriented cube.
The collimation array includes a separate collimator or an integrated collimator.
The homogenized film comprises at least one of a film having a micro-cylindrical pattern, a film having a micro-spherical pattern, and a light-forming diffuser.
The backlighting apparatus according to claim 18, wherein the reoriented cube includes a cube having a symmetrical prism structure or a cube having an asymmetric prism structure. The second lighting unit is
A second light source that emits second light in the 2D display mode,
A second light conversion unit that adjusts the second light to form the second light beam and causes the second light beam to enter the light guide plate.
The backlight device according to any one of claims 13 to 19, wherein the backlight device comprises. The backlight device according to claim 20, wherein the second light conversion unit performs at least one of angle conversion, homogenization, and collimation with respect to the second light. The optical redirection film is any one of claims 13 to 21, wherein the separated first light beam is directed toward the viewer so that the first light beam separated from the light guide plate in the 3D display mode is directed toward the viewer. The backlight device described in the section. The reflective film reflects the second light beam separated from the light guide plate in the 2D display mode to change the angular distribution.
The reflective film includes at least one of a film in which a micro / spherical convex or concave lens is patterned, a film in which a micro-pyramid lens is patterned, and a reflection diffuser having a Lambert angle distribution. The backlight device according to any one of claims 13 to 22. Further including a Fresnel lens film for concentrating the first light beam or the second light beam emitted from the light redirection film on the region where the viewer is located.
The backlight device according to any one of claims 13 to 23, wherein the Fresnel lens film has a radial structure or a cylindrical structure. The backlight device according to any one of claims 13 to 24, further comprising a controller for setting the display mode of the backlight device to any one of the 3D display mode and the 2D display mode. .. The controller
When the backlight device operates in the 3D display mode, the first illumination unit is controlled so as to radiate the first light beam toward the light guide plate.
25. The backlight device according to claim 25, wherein when the backlight device operates in a 2D display mode, the second illumination unit is controlled so as to radiate the second light beam toward the light guide plate.