JP2012252937A - Light source device and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device, along with a display device, capable of achieving a function equivalent to a parallax barrier.SOLUTION: The light source device includes a plurality of phosphor sections arranged at intervals in a designated direction and emitting first visible light by being excited with designated exciting light, and first light sources for emitting the designated exciting light. Further, second light sources controlling light emission by being independent from the first light sources and emitting second visible light toward the phosphor sections are arranged in the light source device. Here, ultraviolet light is used as designated exciting light.

Description

  The present disclosure relates to a light source device and a display device that enable stereoscopic viewing by a parallax barrier (parallax barrier) method.

  A parallax barrier type stereoscopic display device is known as one of the stereoscopic display methods capable of stereoscopic viewing with the naked eye without wearing special glasses. In this stereoscopic display device, a parallax barrier is disposed opposite to the front surface (display surface side) of a two-dimensional display panel. The general structure of the parallax barrier is provided with shielding portions that shield display image light from the two-dimensional display panel and stripe-shaped openings (slit portions) that transmit display image light alternately in the horizontal direction. Is.

  In the parallax barrier method, a parallax image for stereoscopic viewing (a right-eye viewpoint image and a left-eye viewpoint image in the case of two viewpoints) is spatially divided and displayed on a two-dimensional display panel. Stereoscopic viewing is performed by separating the parallax in the horizontal direction by the barrier. By appropriately setting the slit width and the like in the parallax barrier, when the observer views the stereoscopic display device from a predetermined position and direction, light of different parallax images is observed on the left and right eyes of the observer via the slit portion. Can be incident separately.

  For example, when a transmissive liquid crystal display panel is used as the two-dimensional display panel, a configuration in which a parallax barrier is disposed on the back side of the two-dimensional display panel is also possible (FIG. 10 of Patent Document 1 and FIG. 2). 3). In this case, the parallax barrier is disposed between the transmissive liquid crystal display panel and the backlight.

Japanese Patent No. 3565391 (FIG. 10) Japanese Patent Laying-Open No. 2007-187823 (FIG. 3)

  However, since a parallax barrier type stereoscopic display device requires a dedicated component for 3D display called a parallax barrier, the number of parts and the arrangement space are required to be larger than those of a normal display device for 2D display. There is a problem of becoming.

  An object of the present disclosure is to provide a light source device and a display device capable of realizing a function equivalent to a parallax barrier.

  A plurality of light source devices according to the present disclosure are arrayed at intervals in a predetermined direction, are excited by predetermined excitation light and emits first visible light, and a first light source that emits predetermined excitation light It is equipped with.

  A display device according to the present disclosure includes a display unit that displays an image and a light source device that emits light for image display toward the display unit, and the light source device is configured by the light source device of the present disclosure. is there.

  In the light source device or the display device according to the present disclosure, the phosphor portion is excited by predetermined excitation light from the first light source, and first visible light is emitted. Since a plurality of phosphor parts are arranged at intervals in a predetermined direction, the phosphor part can have a function as a parallax barrier. That is, equivalently, it can function as a parallax barrier having the phosphor portion as an opening (slit portion).

  According to the light source device or the display device of the present disclosure, a plurality of phosphor portions are arranged at intervals in a predetermined direction, and the phosphor portions are excited by predetermined excitation light to emit first visible light. Therefore, it can have a function as a parallax barrier.

It is sectional drawing which shows one structural example of the display apparatus which concerns on 1st Embodiment of this indication with the emission state of the light ray from a light source device at the time of setting only a 1st light source to an ON (lighting) state. FIG. 3 is a cross-sectional view showing an example of the configuration of the display device shown in FIG. 1 together with the state of emission of light from the light source device when only the second light source is turned on (lighted). It is sectional drawing which shows one structural example of the display apparatus which concerns on 2nd Embodiment with the emission state of the light ray from a light source device at the time of setting only a 1st light source to an ON (lighting) state. FIG. 4 is a cross-sectional view showing a configuration example of the display device shown in FIG. 3 together with the state of emission of light from the light source device when only the second light source is turned on (lighted). It is sectional drawing which shows one structural example of the display apparatus which concerns on 3rd Embodiment with the emission state of the light ray from a light source device at the time of setting only a 1st light source to an ON (lighting) state. It is sectional drawing which shows one structural example of the display apparatus which concerns on 4th Embodiment with the emission state of the light ray from a light source device at the time of setting only a 1st light source to an ON (lighting) state. FIG. 7 is a cross-sectional view showing a configuration example of the display device shown in FIG. 6 together with the state of emission of light from the light source device when only the second light source is turned on (lighted).

  Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

<First Embodiment>
[Overall configuration of display device]
1 and 2 illustrate a configuration example of the display device according to the first embodiment of the present disclosure. The display device includes a display unit 1 that performs image display, and a light source device that is disposed on the back side of the display unit 1 and emits light for image display toward the display unit 1. The light source device includes, in order from the viewer side (display unit 1 side), an ultraviolet cut filter (optical filter) 53, a phosphor unit 52 formed on the transparent substrate 51, and a first light source 61 (for 2D / 3D display). Light source) and a second light source 62 (light source for 2D display). In addition, the display device includes a control circuit for the display unit 1 necessary for display, but the configuration is the same as that of a general display control circuit. Omitted. Although not shown, the light source device includes a control circuit that performs on (lighting) / off (non-lighting) control of the first light source 61 and the second light source 62.

  This display device can selectively switch between a two-dimensional (2D) display mode on a full screen and a three-dimensional (3D) display mode on a full screen. Switching between the two-dimensional display mode and the three-dimensional display mode is performed by performing switching control of image data displayed on the display unit 1 and switching control of on / off of the first light source 61 and the second light source 62. It is possible. FIG. 1 schematically shows the emission state of light from the light source device when only the first light source 61 is turned on (lit), which corresponds to the three-dimensional display mode. FIG. 2 schematically shows the emission state of the light beam from the light source device when only the second light source 62 is turned on (lighted), which corresponds to the two-dimensional display mode.

  The display unit 1 is configured using a transmissive two-dimensional display panel, for example, a transmissive liquid crystal display panel, and includes, for example, an R (red) pixel, a G (green) pixel, and a B (blue) pixel. There are a plurality of pixels, and the plurality of pixels are arranged in a matrix. The display unit 1 performs two-dimensional image display by modulating light from the light source device for each pixel according to image data. A plurality of viewpoint images based on three-dimensional image data and images based on two-dimensional image data are selectively switched and displayed on the display unit 1. The three-dimensional image data is data including a plurality of viewpoint images corresponding to a plurality of viewing angle directions in a three-dimensional display, for example. For example, when two-dimensional three-dimensional display is performed, the viewpoint image data is for right-eye display and left-eye display. When performing display in the three-dimensional display mode, for example, a composite image including a plurality of stripe-like viewpoint images in one screen is generated and displayed.

  A plurality of, for example, alternately, the first light source 61 and the second light source 62 are provided in the same housing 60, and constitute one direct type backlight as a whole. The first light source 61 and the second light source 62 are connected to drive circuits (not shown) that are independent of each other, and brightness can be controlled independently of each other. Each of the first light source 61 and the second light source 62 becomes a planar light source as a whole, and a mixing space 63 is formed in the housing 60 so that the phosphor portion 52 can be irradiated with a substantially uniform light beam. Is provided. In order to make the emitted light uniform, a light diffusing plate or the like may be disposed on the upper surface of the housing 60. When the mixing space 63 is narrow and has a depth of, for example, about 10 mm, in order to extract uniform light for each of the first light source 61 and the second light source 62, for example, a light source having a wide light distribution characteristic at a pitch of 10 mm. Realization is possible by arranging.

  As shown in FIG. 1, the first light source 61 emits ultraviolet light L61 as predetermined excitation light for exciting the phosphor portion 52 to generate the first visible light L61A. The second light source 62 emits second visible light L62 as shown in FIG. The 1st light source 61 and the 2nd light source 62 can be comprised by LED (Light Emitting Diode), for example. However, the first light source 61 and the second light source 62 may not be LEDs as long as they emit ultraviolet light or visible light. For example, a laser light source or a fluorescent lamp such as CCFL (Cold Cathode Fluorescent Lamp) may be used. Also, different types of light sources may be used in combination.

  The first light source 61 and the second light source 62 are controlled to be turned on (lighted) and turned off (not lighted) in accordance with switching between the two-dimensional display mode and the three-dimensional display mode. Specifically, the first light source 61 is controlled to be in a lighting state when displaying an image based on the three-dimensional image data on the display unit 1 (in the case of the three-dimensional display mode) and two-dimensionally displayed on the display unit 1. When an image based on the image data is displayed (in the case of the two-dimensional display mode), it is controlled to a non-lighting state or a lighting state. Further, the second light source 62 is controlled to be in a non-lighting state when displaying an image based on the three-dimensional image data on the display unit 1 (in the case of the three-dimensional display mode), and the two-dimensional image is displayed on the display unit 1. When displaying an image based on data (in the case of the two-dimensional display mode), the lighting state is controlled.

  The phosphor part 52 is formed by applying phosphors in a predetermined arrangement pattern on the surface of the transparent substrate 51. As the transparent substrate 51, a colorless and transparent acrylic plate or glass plate can be used. The transparent substrate 51 is not a plate-like material and may be a PET film or the like. 1 and 2 show an example in which the phosphor portion 52 is formed on the display portion 1 side in the transparent substrate 51, but there is a back side (the first light source 61 and the second light source 62 are present). Side).

  The phosphor portion 52 functions as an opening (slit portion) in the parallax barrier method in the three-dimensional display mode (when only the first light source 61 is turned on). Therefore, a plurality of phosphor portions 52 are arranged at intervals in a predetermined direction so as to have a structure corresponding to the opening portion of the parallax barrier. In addition, as a barrier pattern of the parallax barrier corresponding to the arrangement pattern of the phosphor portions 52, for example, a striped pattern in which a large number of vertically long slit-like openings are arranged in parallel in the horizontal direction via the shielding portion. Various types can be used such as, but not limited to a specific type.

[Operation of display device]
In the display device, when displaying in the three-dimensional display mode, the display unit 1 displays an image based on the three-dimensional image data, and the first light source 61 and the second light source 62 are used for three-dimensional display. On (lit) and off (non-lit) are controlled. Specifically, as shown in FIG. 1, the first light source 61 is turned on (lit) to emit ultraviolet light L61, and the second light source 62 is controlled to be turned off (not lit). In this state, a part of the ultraviolet light L61 emitted from the first light source 61 is converted into the first visible light L61A by the phosphor portion 52. The first visible light L61A passes through the ultraviolet cut filter 53 and enters the display unit 1. This state is optically equivalent to that in the parallax barrier system, the light from the backlight passes through the opening of the parallax barrier and enters the liquid crystal panel or the like. Light that is not converted into visible light by the phosphor portion 52 is absorbed by the ultraviolet cut filter 53.

  On the other hand, when performing display in the two-dimensional display mode, the display unit 1 performs image display based on the two-dimensional image data, and the first light source 61 and the second light source 62 are used for two-dimensional display. Controls on (lit) and off (not lit). Specifically, for example, as shown in FIG. 2, the first light source 61 is turned off (non-lighted), and the second light source 62 is controlled to be turned on (lighted) so as to generate the second visible light. Issue L62. In this state, the second visible light L62 emitted from the second light source 62 passes through the transparent substrate 51, the phosphor part 52, and the ultraviolet cut filter 53 over almost the entire surface, and enters the display part 1. To do. This state is the same as the combination of a normal surface emitting backlight and a liquid crystal panel.

  In addition, when performing display in the two-dimensional display mode, it is conceivable that the state of transmission of the second visible light L62 differs between the portion where the phosphor portion 52 is present and the portion where the phosphor portion 52 is not present in the transparent substrate 51. This influence varies depending on the width and thickness of the phosphor portion 52, but if this influence cannot be ignored, it can be improved by turning on the first light source 61 in an auxiliary manner.

[effect]
As described above, according to the display device according to the present embodiment, it is possible to function equivalently as a parallax barrier having the phosphor portion 52 as an opening (slit portion). In particular, if the transparent substrate 51 that forms the phosphor portion 52 is formed in a film shape, the weight can be reduced.

<Second Embodiment>
Next, a display device according to the second embodiment of the present disclosure will be described. Note that components that are substantially the same as those of the display device according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.

[Overall configuration of display device]
3 and 4 illustrate a configuration example of a display device according to the second embodiment of the present disclosure. This display device can arbitrarily and selectively switch between the two-dimensional display mode and the three-dimensional display mode, similarly to the display devices of FIGS. 1 and 2. 3 corresponds to the configuration in the 3D display mode, and FIG. 4 corresponds to the configuration in the 2D display mode. 3 and 4 also schematically show the emission state of light from the light source device in each display mode.

  In the configuration examples of FIGS. 1 and 2, the first light source 61 and the second light source 62 are configured as direct backlights. However, in the present embodiment, the first light source 61 and the second light source 62 The light source 62 is provided on the side surface of the same light guide plate 70 and constitutes one light guide type backlight as a whole. For example, white reflective dots 71 are provided on the bottom surface of the light guide plate 70. The reflective dots 71 are provided in a predetermined pattern so that uniform light is emitted from the upper surface of the light guide plate 70.

  The first light source 61 emits ultraviolet light L61 (FIG. 3) from the side surface direction toward the inside of the light guide plate. The second light source 62 emits the second visible light L62 (FIG. 4) from the side surface direction toward the inside of the light guide plate 70. Each of the first light source 61 and the second light source 62 is disposed on the side surface of the light guide plate 70 one by one. For example, when the planar shape of the light guide plate 70 is a quadrangle, the number of side surfaces is four, but the first light source 61 and the second light source 62 may be arranged on at least one of the side surfaces. 3 and 4 show a configuration example in which the first light source 61 and the second light source 62 are arranged on two side surfaces of the light guide plate 70 facing each other.

[Operation and effects of display device]
This display device is different from the first embodiment in that the configuration of the light source portion is a light guide type backlight, but its display operation (light source control operation) and effects are fundamental. This is the same as the first embodiment.

<Third Embodiment>
Next, a display device according to the third embodiment of the present disclosure will be described. Note that components that are substantially the same as those of the display device according to the first or second embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.

[Overall configuration of display device]
FIG. 5 illustrates a configuration example of a display device according to the third embodiment of the present disclosure. This display device can arbitrarily and selectively switch between the two-dimensional display mode and the three-dimensional display mode, similarly to the display devices of FIGS. 1 and 2. FIG. 3 corresponds to the configuration in the three-dimensional display mode.

  In this display device, the transparent substrate 51 in the configuration example of FIGS. 1 and 2 is an ultraviolet cut glass 51A, and a phosphor portion 52 is formed on the back side (light source side) of the ultraviolet cut glass 51A. By using the ultraviolet cut glass 51A as the transparent substrate 51 forming the phosphor portion 52, the ultraviolet cut filter 53 can be omitted from the configuration.

[Operation and effects of display device]
This display device is different from that of the first embodiment in the configuration of the portion that performs ultraviolet cut, but its display operation (light source control operation) and effects are basically the same as those of the first embodiment. is there.

<Fourth embodiment>
Next, a display device according to the fourth embodiment of the present disclosure will be described. Note that components that are substantially the same as those of the display device according to the first to third embodiments are denoted by the same reference numerals, and description thereof is omitted as appropriate.

[Overall configuration of display device]
6 and 7 illustrate a configuration example of a display device according to the fourth embodiment of the present disclosure. This display device can arbitrarily and selectively switch between the two-dimensional display mode and the three-dimensional display mode, similarly to the display devices of FIGS. 1 and 2. 6 corresponds to the configuration in the 3D display mode, and FIG. 7 corresponds to the configuration in the 2D display mode. 6 and 7 also schematically show the emission state of light from the light source device in each display mode.

  This display device includes a light guide plate 3 in place of the transparent substrate 51 in the configuration examples of FIGS. The light guide plate 3 has a first internal reflection surface 3A and a second internal reflection surface 3B that face each other. The surface of the light guide plate 3 other than the second internal reflection surface 3B is transparent over the entire surface. For example, when the planar shape of the light guide plate 3 is a quadrangle, the first internal reflection surface 3A and the four side surfaces are transparent over the entire surface.

  In the present embodiment, the first light source 61 is provided on the side surface of the light guide plate 3. The first light source 61 emits ultraviolet light L61 (FIG. 6) from the side surface direction toward the inside of the light guide plate 3. At least one first light source 61 is disposed on the side surface of the light guide plate 3. For example, when the planar shape of the light guide plate 3 is a quadrangle, the number of side surfaces is four, but the first light source 61 may be disposed on at least one of the side surfaces. 6 and 7 show a configuration example in which the first light source 61 is arranged on two side surfaces of the light guide plate 3 facing each other.

  In the present embodiment, the phosphor portion 52 is formed on the second internal reflection surface 3 </ b> B of the light guide plate 3. In the second internal reflection surface 3 </ b> B, a portion where the phosphor portion 52 is not formed is a total reflection area 32. For example, the phosphor portion 52 can be formed by forming a groove in the second internal reflection surface 3B of the light guide plate 3 by laser processing, sandblasting, or the like and filling the groove with the phosphor. . In the second internal reflection surface 3B, the phosphor portion 52 functions as an opening (slit portion) as a parallax barrier and the total reflection area 32 functions as a shielding portion when in the three-dimensional display mode. It has become. That is, the second internal reflection surface 3B has a structure corresponding to a parallax barrier. As the material of the light guide plate 3, Sumitomo Chemical's Sumipex 010, for example, having a high ultraviolet transmittance can be used.

  In the present embodiment, the second light source 62 is disposed opposite to the light guide plate 3 on the side where the second internal reflection surface 3B is formed. The second light source 62 emits second visible light L62 (FIG. 7) from the back side of the light guide plate 3 toward the light guide plate 3. In the present embodiment, the second light source 62 may be a planar light source that emits light with uniform in-plane luminance, and the structure itself is not limited to a specific one, and a commercially available planar backlight. Can be used. For example, a structure using a light emitter such as CCFL or LED and a light diffusing plate for making the in-plane luminance uniform can be considered.

[Operation of display device]
This display device is different from the first embodiment in the configuration of the first light source 61 and the configuration of the portion forming the phosphor portion 52, but the display operation (light source control operation) is basically the same. This is the same as in the first embodiment.

<Other embodiments>
The technology according to the present disclosure is not limited to the description of each of the above embodiments, and various modifications can be made.
For example, in the fourth embodiment (FIGS. 6 and 7), the configuration example in which the phosphor portion 61 and the total reflection area 32 are provided on the second internal reflection surface 3B side in the light guide plate 3 has been described. However, the structure which provided them in the 1st internal reflective surface 3A side may be sufficient.

For example, this technique can take the following composition.
(1)
A plurality of phosphor portions arranged at intervals in a predetermined direction and excited by predetermined excitation light to emit first visible light; and
A light source device comprising: a first light source that emits the predetermined excitation light.
(2)
The light source device according to (1), further comprising: a second light source that emits second visible light toward the phosphor portion, the light emission of which is controlled independently of the first light source.
(3)
The light source device according to (1) or (2), further including an optical filter that absorbs the predetermined excitation light.
(4)
The light source device according to any one of (1) to (3), wherein the predetermined excitation light is ultraviolet light.
(5)
The said 1st light source and the said 2nd light source are provided in the same housing | casing, and comprise the one direct type | mold backlight as a whole. Any one of said (2) thru | or (4). Light source device.
(6)
Any one of the above (2) to (4), wherein the first light source and the second light source are provided on a side surface of the same light guide plate to constitute one light guide type backlight as a whole. The light source device according to one.
(7)
A light guide plate having a first internal reflection surface and a second internal reflection surface facing each other;
The phosphor portion is formed on the first internal reflection surface or the second internal reflection surface,
The first light source is configured to irradiate the predetermined excitation light from a side surface of the light guide plate toward the inside of the light guide plate,
The second light source is disposed to face the light guide plate, and irradiates the second visible light from the back side of the light guide plate toward the light guide plate. Any one of (2) to (4) The light source device according to 1.

  DESCRIPTION OF SYMBOLS 1 ... Display part, 3 ... Light guide plate, 3A ... 1st internal reflection surface, 3B ... 2nd internal reflection surface, 32 ... Total reflection area, 51 ... Transparent substrate, 51A ... Ultraviolet cut glass, 52 ... Phosphor part , 53 ... UV cut filter (optical filter), 60 ... housing, 61 ... first light source (light source for 2D / 3D display), 62 ... second light source (light source for 2D display), 63 ... mixing space, 70 ... light guide plate, 71 ... reflecting dots, L61 ... excitation light (ultraviolet light), L61A ... first visible light, L62 ... second visible light.

Claims (11)

A plurality of phosphor portions arranged at intervals in a predetermined direction and excited by predetermined excitation light to emit first visible light; and
A light source device comprising: a first light source that emits the predetermined excitation light. The light source device according to claim 1, further comprising: a second light source that is controlled to emit light independently of the first light source and emits second visible light toward the phosphor portion. The light source device according to claim 1, further comprising an optical filter that absorbs the predetermined excitation light. The light source device according to claim 1, wherein the predetermined excitation light is ultraviolet light. The light source device according to claim 2, wherein the first light source and the second light source are provided in the same casing, and constitute one direct type backlight as a whole. The light source device according to claim 2, wherein the first light source and the second light source are provided on a side surface of the same light guide plate, and constitute one light guide type backlight as a whole. A light guide plate having a first internal reflection surface and a second internal reflection surface facing each other;
The phosphor portion is formed on the first internal reflection surface or the second internal reflection surface,
The first light source is configured to irradiate the predetermined excitation light from a side surface of the light guide plate toward the inside of the light guide plate,
The light source device according to claim 2, wherein the second light source is disposed to face the light guide plate, and irradiates the second visible light from a back side of the light guide plate toward the light guide plate. A display unit for displaying images;
A light source device that emits light for image display toward the display unit,
The light source device is:
A plurality of phosphor portions arranged at intervals in a predetermined direction and excited by predetermined excitation light to emit first visible light; and
And a first light source that emits the predetermined excitation light. The light source device is:
The display device according to claim 8, further comprising: a second light source that is controlled to emit light independently from the first light source and emits second visible light toward the phosphor portion. The display unit selectively displays a plurality of viewpoint images based on 3D image data and an image based on 2D image data.
The second light source is controlled to be in a non-lighting state when displaying the plurality of viewpoint images on the display unit, and is lit when displaying an image based on the two-dimensional image data on the display unit. The display device according to claim 9 controlled by a state. The first light source is controlled to be lit when displaying the plurality of viewpoint images on the display unit, and is not lit when displaying an image based on the two-dimensional image data on the display unit. The display device according to claim 10, wherein the display device is controlled to a state or a lighting state.

Images