JP2009216822A - Display device and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device for displaying a high-brightness and high-quality image while achieving power saving, and to provide an electronic apparatus provided with the display device. <P>SOLUTION: The display device comprises: a light modulation device provided with a plurality of transmissive window parts; a light source device 3 provided with a light source 31 emitting light; a light guide member 4 provided with a tubular reflective surface 41 having a function of guiding light toward the light modulation device from the light source 31; and a reflection part which is disposed according to a part other than the transmissive window parts in the neighborhood of the light source 31 side of the light modulation device and/or in the light modulation device, and reflects light from the light guide member 4 to the light guide member 4 side. The tubular reflective surface 41 converges from the light modulation device side to the light source device 3 side so as to guide the light reflected on the reflection part to the transmissive window parts, and an inclination angle θ with respect to an axial line (optical axis OA) of the tubular reflection surface 41 is 8° or more. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device and an electronic apparatus.

A display device such as a projection type projector or a display includes, for example, a light modulation element such as a liquid crystal light valve, and a light source such as an LED (light emitting diode) or an LD (laser diode) that emits light to the light modulation element. (For example, refer to Patent Document 1).
Further, in the display device according to Patent Document 1, a rod integrator is provided between the light modulation element and the light source. Then, the light modulation element is irradiated with light from the light source via the rod intector. Thus, by using a rod integrator, the light from a light source can be uniformly irradiated to the desired area | region of a light modulation element.

By the way, in a light modulation element such as a liquid crystal light valve, a part that transmits light and a part that does not transmit light are inevitably formed, but the part that transmits light is formed in the entire light modulation element (display area). Occupancy ratio, so-called aperture ratio is low.
In the display device according to Patent Document 1, a part of the light from the light source is reflected by the portion that does not transmit the light and is wasted without being used. For this reason, in order to display an image having a desired brightness, a high-luminance light source device is required, resulting in an increase in power consumption.

JP 2005-140837 A

  The objective of this invention is providing the display apparatus which can display a high-intensity and a high quality image, and an electronic device provided with this display apparatus, aiming at power saving.

Such an object is achieved by the present invention described below.
The display device of the present invention includes a light modulation element including a plurality of light-transmissive windows, and
A light source device including a light source that emits light;
A light guide member including a cylindrical reflection surface having a function of guiding light from the light source toward the light modulation element;
Provided in the vicinity of the light source side of the light modulation element and / or in the light modulation element so as to correspond to a portion other than the light transmission window portion, and reflects light from the light guide member toward the light guide member side. And a reflective part
The cylindrical reflecting surface converges from the light modulation element side to the light source device side so as to guide light reflected by the reflecting portion to the light transmitting window portion, and the cylindrical reflecting surface The inclination angle θ with respect to the axis is 8 ° or more.
Thereby, since the light reflected by the reflecting portion is effectively used, it is possible to display a high-luminance and high-quality image while saving power.

In the display device according to the aspect of the invention, the light source device is provided so as to cover an inner region of one end of the cylindrical reflecting surface, and the light modulation element covers an inner region of the other end of the cylindrical reflecting surface. It is preferable that a region provided so as to be covered and surrounded by the cylindrical reflection surface, the light source device, and the light modulation element forms a closed region including the light source.
Thereby, since the light reflected by the reflecting portion is more effectively used, a high-luminance and high-quality image can be displayed.
In the display device according to the aspect of the invention, it is preferable that the inclination angle θ is constant over substantially the entire region in the axial direction of the cylindrical reflecting surface.
Thereby, it is possible to easily and reliably improve the uniformity of light emitted from the light source device to the light modulation element and display a high-quality image.

In the display device of the present invention, a polarization separation element that transmits polarized light in a predetermined direction and reflects polarized light in a direction orthogonal to the predetermined direction is provided between the light modulation element and the light source device. Is preferred.
Thereby, the light which does not permeate | transmit a polarization separation element can be used effectively.
In the display device of the present invention, it is preferable that a retardation plate for controlling the polarization state is provided between the polarization separation element and the light source device.
Thereby, when returning from the light guide member by shifting the phase of light that does not pass through the polarization separation element, the ratio of passing through the polarization separation element can be increased to effectively use the light.

In the display device of the present invention, a color filter having a plurality of wavelength selection units is provided in the vicinity of the light modulation element, and at least one of the wavelength selection units has a characteristic of reflecting light in an opaque wavelength band. It is preferable to have.
Thereby, the light which does not pass the wavelength selection part of a color filter can be used effectively.

In the display device according to the aspect of the invention, it is preferable that the plurality of wavelength selection units include wavelength selection units having a plurality of different wavelength bands.
When displaying an image using a wavelength selection unit of multiple colors (for example, when displaying a full color image using a wavelength selection unit of three colors of R (red), G (green), and B (blue)), light The aperture ratio of the modulation element becomes extremely small. Therefore, the effect becomes remarkable by applying the present invention.

In the display device according to the aspect of the invention, it is preferable that the light modulation element includes a wiring, and the reflection portion is provided corresponding to the wiring and also serves as a light shielding layer that shields the wiring.
When displaying an image using a wavelength selection unit of multiple colors (for example, when displaying a full color image using a wavelength selection unit of three colors of R (red), G (green), and B (blue)), light The aperture ratio of the modulation element becomes extremely small. Therefore, by applying the present invention, the light shielded by the light shielding layer can be used effectively, and the effect becomes remarkable.

In the display device of the present invention, it is preferable that the light applied to the light modulation element is configured to be substantially white light.
Thereby, for example, a full color image can be easily realized in combination with a color filter.
In the display device of the present invention, the light source device has a phosphor in contact with or near the light source, and the light source emits excitation light that excites the phosphor. Is preferred.
Most of the light reflected by the reflecting portion is guided to the light transmitting window portion by the cylindrical reflecting surface, but the remaining portion is guided to the light source. Therefore, the remaining light can be used for excitation of the phosphor. As a result, the brightness of the image can be improved.

In the display device of the present invention, it is preferable that the color temperature of substantially white light emitted from the light source device is 6500K or higher.
Thereby, in the result of using the light reflected by the reflecting part for excitation of the phosphor, it is possible to balance the excitation light and the fluorescence and maintain a good color balance.
An electronic apparatus according to the present invention includes the display device according to the present invention.
Accordingly, it is possible to provide an electronic device that displays a high-luminance and high-quality image while saving power.

Hereinafter, preferred embodiments of a display device and an electronic apparatus according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view showing a schematic configuration of an embodiment of a display device according to the present invention, FIG. 2 is a longitudinal sectional view (cross-sectional view taken along line AA in FIG. 1) of the display device shown in FIG. FIG. 4 is a sectional view showing a schematic configuration of the light modulation element shown in FIG. 2, FIG. 4 is a sectional view showing a schematic configuration of the light source device shown in FIG. 2, and FIG. 5 is for explaining the light guide member shown in FIG. (A) is an AA line sectional view in Drawing 1, (b) is a BB line sectional view in Drawing 1. In FIGS. 2 and 5, the dimensions and the like are exaggerated for convenience of explanation.

  A display device 1 shown in FIG. 1 projects an image by projecting image light onto a screen S. As shown in FIGS. 1 and 2, the display device 1 includes a light modulation device 2 having a light modulation (spatial modulation) function, a light source device 3 that irradiates light to the light modulation device 2, and a light source device. 3 includes a light guide member 4 having a function of guiding light from 3 to the light modulation device 2 and a projection lens 5 that projects light (image light) modulated by the light modulation device 2 onto a screen S.

Hereinafter, each part which comprises the display apparatus 1 is demonstrated sequentially.
(Light modulation device)
The light modulation device 2 has a function of performing two-dimensional luminance modulation on the irradiated light L. As shown in FIG. 3, such a light modulation device 2 includes a color filter 21, a liquid crystal panel (light modulation element) 22 bonded to the color filter 21, and 1 provided so as to sandwich them. It has a pair of polarizing layers 23 and 24.

The color filter 21 includes a substrate 211, a plurality of wavelength selection units 212, and a light shielding layer 213 provided between the substrate 211 and the plurality of wavelength selection units 212.
A substrate 211 and a transparent substrate are made of, for example, various glass fused quartz.
A plurality of wavelength selection units 212 are bonded to the lower surface of the substrate 211 in FIG. 3 via a light shielding layer 213.

The plurality of wavelength selectors 212 are arranged in a matrix.
In the present embodiment, the plurality of wavelength selection units 212 includes a plurality of wavelength selection units 212R that convert incident light into red, a plurality of wavelength selection units 212G that convert incident light into green, and blue light that is incident. And a plurality of wavelength selectors 212B for converting to. Thereby, a full color image can be displayed.
In this way, when the plurality of wavelength selection units 212 are configured by a plurality of different wavelength selection units 212R, 212G, and 212B, the aperture ratio of the liquid crystal panel 22 becomes extremely small. Therefore, the effect by applying this invention using the light guide member 4 mentioned later becomes remarkable.

  Further, it is preferable that at least one of the plurality of wavelength selection units 212 has a characteristic of reflecting light in the non-transmission wavelength band (wavelength band other than the wavelength band targeted for color conversion as described above). Thereby, the light which does not pass the wavelength selection part 212 of the color filter 21 can be used effectively. In this case, for example, a dielectric multilayer configured to transmit light in a wavelength band targeted for color conversion to at least one of the plurality of wavelength selection units 212 and reflect light in other wavelength bands. An element using a film or a self-cloning photonic crystal may be provided.

  The light shielding layer 213 has a plurality of openings 214 corresponding to the plurality of wavelength selection units 212 described above and a plurality of individual electrodes 224 described later. Each aperture 214 is a transparent window portion, and light can be incident on each wavelength selection unit 212 corresponding thereto through each aperture 214. In this embodiment, each opening 214 is filled with a transparent material such as a transparent resin material, glass material, or metal material.

The light shielding layer 213 is also provided corresponding to a switching element 229 and its wiring, which will be described later, and has a function of preventing light from being irradiated to the switching element 229 and its wiring, which will be described later. As a result, it is possible to prevent the occurrence of problems such as light leakage of the switching element 229.
In particular, the surface of the light shielding layer 213 on the substrate 211 side has light reflectivity. That is, the light shielding layer 213 constitutes a reflection part that reflects (returns) light from the light guide member 4 toward the light guide member 4 side.

Thus, since the light shielding layer 213 also serves as the reflection portion as described above, the light shielded by the light shielding layer 213 can be guided to the light guide member 4 to be described later, and the light can be effectively used.
The constituent material of the light shielding layer 213 is not particularly limited as long as the surface of the light shielding layer 213 on the substrate 211 side has light reflectivity and light shielding properties. For example, silver, aluminum A metal such as an aluminum alloy, a dielectric multilayer film (optical multilayer film), or the like can be used. Further, the entire light shielding layer 213 may be made of metal, or only the vicinity of the surface of the light shielding layer 213 on the substrate 211 side may be made of metal or a dielectric multilayer film.

The light shielding layer 213 may be any layer that reflects at least one of light (excitation light) from the light source 31 (to be described later) and fluorescence from the phosphor 32, but light (excitation) from the light source 31 (to be described later). It is preferable to have a reflectance peak in the vicinity of at least one of the peak wavelength of the light) and the peak wavelength of the fluorescence from the phosphor 32.
A liquid crystal panel 22 is provided on the light emission side surface of the color filter 21.

The liquid crystal panel 22 is a transmissive light modulation element that changes the spatial distribution of the polarization direction of irradiated light.
Such a liquid crystal panel 22 includes a substrate 221, a liquid crystal layer 222 made of liquid crystal sealed between the substrate 221 and the color filter 21, a plurality of pixel electrodes 223 for applying a voltage to the liquid crystal layer 222, and A common electrode 224 and a pair of alignment films 225 and 226 for aligning the liquid crystal of the liquid crystal layer 222 are provided.

The substrate 221 is a transparent substrate and is made of, for example, various glasses.
The liquid crystal layer 222 contains liquid crystal molecules (not shown), and the alignment of the liquid crystal molecules, that is, the liquid crystal changes according to the voltage application state between the pixel electrode 223 and the common electrode 224.
Such a liquid crystal layer 222 is provided between the pair of alignment films 225 and 226 so as to be in contact therewith. Thereby, the liquid crystal of the liquid crystal layer 222 at a predetermined time can be brought into a predetermined alignment state.

A plurality of pixel electrodes 223 are provided on the opposite side of the alignment film 225 from the liquid crystal layer 222, and a common electrode 224 is provided on the opposite side of the alignment film 226 from the liquid crystal layer 222.
Each pixel electrode 223 and common electrode 224 are transparent electrodes, and are made of, for example, indium tin oxide (ITO).
The plurality of pixel electrodes 223 are provided corresponding to the plurality of wavelength selection units 212 described above, and are arranged in a matrix.

A switching element 229 such as a TFT is provided in the vicinity of each pixel electrode 223 so as to correspond to each pixel electrode 223. The switching element 229 can control the voltage application state between each pixel electrode 223 and the common electrode 224.
In addition, although not shown, a wiring for energizing each switching element 229 is provided between the pixel electrodes 223.

The polarizing layer 23 is provided on the surface of the substrate 221 opposite to the color filter 21, and the polarizing layer 24 is provided on the surface of the substrate 211 opposite to the liquid crystal panel 22.
Each of the pair of polarizing layers 23 and 24 has a function of transmitting only polarized light in a specific direction and shielding polarized light in a direction orthogonal to the specific direction.
In particular, the polarizing layer 24 is configured to reflect polarized light in a direction orthogonal to the specific direction described above. Thereby, the light which does not permeate | transmit the polarizing layer 24 can be effectively utilized by the effect | action of the light guide member 4 mentioned later.

The polarizing layer 24 is not particularly limited as long as it has a function as described above, but a wire grid polarization separation element in which a plurality of fine lines are spaced apart from each other is preferably used.
Instead of the polarizing layer 24, another polarization separation element (such as a photonic lattice polarization element) can also be used.

Further, it is preferable that a retardation plate for controlling the polarization state is provided between the polarizing layer (polarized light separating element) 24 and the light source device 3. Thereby, when the phase of the light that does not pass through the polarizing layer 24 is shifted and returned from the light guide member 4, the ratio of passing through the polarizing layer 24 can be increased to effectively use the light.
The light modulation device 2 includes an image display region (a in FIG. 1) in an inner region of the other end of the cylindrical reflection surface 41 (an end opposite to the light source device 3) as will be described later. An image non-display area (b in FIG. 1) formed around the image display area is provided on the opposite side (light incident side) of the polarizing layer 24 to the color filter 21. ), A reflecting portion 25 is provided as shown in FIG.

The reflective portion (reflective film) 25 has a light reflecting property on the surface opposite to the color filter 21. That is, the reflection unit 25 has a function of reflecting (returning) light from the light guide member 4 toward the light guide member 4 side.
Such a reflection part 25 guides the light irradiated to the image non-display area (that is, the area that does not contribute to image display and does not require light irradiation) to the light guide member 4 to be described later, and effectively uses the light. be able to.

  Such a reflection part 25 can be comprised similarly to the light shielding layer 213 mentioned above. That is, the constituent material of the reflecting portion 25 is not particularly limited, and for example, a metal such as silver, aluminum, and an aluminum alloy, a dielectric multilayer film (optical multilayer film), and the like can be used. Moreover, the reflection part 25 may be composed entirely of metal, or only the vicinity of the surface of the reflection part 25 opposite to the color filter 21 may be composed of metal or a dielectric multilayer film.

The reflection unit 25 may be any unit that reflects at least one of light from the light source 31 (excitation light) to be described later and fluorescence from the phosphor 32, but light from the light source 31 to be described (excitation). It is preferable to have a reflectance peak in the vicinity of at least one of the peak wavelength of the light) and the peak wavelength of the fluorescence from the phosphor 32.
It should be noted that the light shielding layer 213 and the polarizing layer 24 described above may be omitted in a region where the reflection unit 25 is provided (that is, an image non-display region). Further, the reflection portion 25 can be omitted. In this case, it is preferable to provide the light shielding layer 213 and the polarizing layer 24 so as to extend to the image non-display area.

(Light source device)
As shown in FIG. 4, the light source device 3 drives the light source 31, the phosphor 32 provided so as to cover the light emission side of the light source 31, the support base 33 that supports the light source 31, and the light source 31. The circuit board 34 for carrying out, and the base member 35 for fixing these to the light guide member 4 mentioned later are included.

The light source 31 has a function of exciting the phosphor 32. Such a light source 31 includes a light emitting unit 311 that emits light that excites the phosphor 32 (that is, excitation light). In the present embodiment, the light source 31 emits blue light, blue-violet light, or ultraviolet light as excitation light for exciting the phosphor 32.
The light source 31 is not particularly limited, but an LED (light emitting diode), an LD (laser diode), or the like is preferably used. In the present embodiment, the number of the light sources 31 is one, but a plurality of light sources 31 may be provided. In that case, the plurality of light sources may emit excitation light having different wavelengths. At least one of the light sources may be a light source having no phosphor.

Such a light source 31 is joined on the support base 33. The support base 33 is made of a resin material, a ceramic material, or the like, and is installed on the circuit board 34.
The circuit board 34 is electrically connected to the light source 31 via wirings 341 and 342 made of bonding wires or the like. Thereby, electric power can be supplied from the circuit board 34 to the light source 31.

Such a circuit board 34 is fixed to the base member 35.
The pedestal member 35 has a plate shape, and is fixed and installed at an end portion on the light incident side of the light guide member 4 described later.
Such a pedestal member 35 preferably has a light-reflecting surface on the light source 31 side. Thereby, the direct light from the light source 31 and the light returned from the liquid crystal panel 22 side by the light guide member 4 as described later can be reflected to the liquid crystal panel 22 side. As a result, the light use efficiency can be increased and the luminance of the image can be improved. In this case, the surface on the light source 31 side of the pedestal member 35 may be inclined so as to expand toward the light source 31 side.

  The phosphor 32 emits fluorescence when excited by the light (excitation light) from the light source 31 described above. In the present embodiment, the phosphor 32 is configured to emit fluorescence of a color such that the light emitted from the light source device 3 becomes white light (color temperature of 6500 K or more). That is, the light source device 3 excites the phosphor 32 not only by the light from the light source 31 (excitation light) and the light just after being emitted from the light source 31 but also by the light returned from the light shielding layer 213 (reflected light). The light emitted from the liquid crystal panel 22 is combined (synthesized) with the fluorescent light generated by the liquid crystal panel 22 so as to be white light. Thereby, in the result of using the light reflected by the light shielding layer 213 for the excitation of the phosphor 32, it is possible to balance the excitation light and the fluorescence and maintain a good color balance. As a result, a full color image can be easily realized in combination with the color filter 21 as described above.

For example, when a blue light source is used as the light source 31, the fluorescence from the phosphor 32 has a wavelength component from green to red with a peak at a substantially yellow wavelength. Further, when a light source of blue-violet light or ultraviolet light is used as the light source 31, the fluorescence from the phosphor 32 has a wide range of wavelength components from blue to red.
The constituent material of the phosphor 32 is not particularly limited as long as it emits fluorescence as described above, and various fluorescent materials can be used.

  More specifically, examples of fluorescent materials that emit green light include 9,10-bis [(9-ethyl-3-carbazole) -vinylenyl] -anthracene, poly (9,9-dihexyl-2,7- Vinylenefluorenylene), poly [(9,9-dioctylfluorene-2,7-diyl) -co- (1,4-diphenylene-vinylene-2-methoxy-5- {2-ethylhexyloxy} benzene)], Poly [(9,9-dioctyl-2,7-divinylenefluorenylene) -ortho-co- (2-methoxy-5- (2-ethoxylhexyloxy) -1,4-phenylene)] and the like. Examples of fluorescent materials that emit red light include tris (1-phenylisoquinoline) iridium (III), poly [2,5-bis (3,7-dimethyloctyloxy) -1,4. Phenylenevinylene], poly [2-methoxy-5- (2′-ethylhexyloxy) -1,4- (1-cyanovinylene) phenylene], poly [2-methoxy-5- (3,7-dimethyloctyloxy)- 1,4-phenylenevinylene] and the like, and examples of fluorescent materials that emit blue light include 4,4′-bis (9-ethyl-3-carbazovinylene) -1,1′-biphenyl, poly [ (9.9-dioctylfluorene-2,7-diyl) -co- (2,5-dimethoxybenzene-1,4-diyl)], poly [(9,9-dihexyloxyfluorene-2,7-diyl) -Ortho-co- (2-methoxy-5- {2-ethoxyhexyloxy} phenylene-1,4-diyl)], poly [(9,9-dioctylfluorene-2,7-diyl)- Co- (ethylnylbenzene)] and the like. Among these, one kind can be used alone, or two or more kinds can be used in combination.

The phosphor 32 can be formed relatively easily by using various film forming methods and coating methods.
Further, the thickness of the phosphor 32 is not particularly limited as long as it can emit fluorescence as described above, depending on the type of the light source 31 and the inclination angle θ of a cylindrical reflecting surface 41 described later. It is preferable that it is about 10-300 micrometers.

(Light guide member)
As shown in FIGS. 1 and 2, the light guide member 4 includes a cylindrical reflection surface 41. A light source device 3 (light source 31) is provided on one end side of the cylindrical reflection surface 41, and a light modulation device 2 (liquid crystal panel 22) is provided on the other end side. More specifically, the other end (end opposite to the light source device 3) of the cylindrical reflecting surface 41 includes the image display region (a in FIG. 1) of the light modulation device 2 described above. It faces the light modulation device 2.
Such a cylindrical reflection surface 41 has a function of guiding light from the light source 31 toward the liquid crystal panel 22. That is, a light guide space for guiding light is formed inside the cylindrical reflection surface 41. The light guide space is formed so as to be substantially symmetrical with respect to the optical axis OA.

In the present embodiment, the light guide member 4 has a quadrangular prism shape, and a hollow portion 42 penetrating along the axis (optical axis OA) is formed. The inner peripheral surface of the light guide member 4 has light reflectivity and constitutes a cylindrical reflection surface 41.
Further, the hollow section 42 has a square cross section (cross section perpendicular to the optical axis OA). That is, the cross section of the reflecting surface 41 is square. In addition, the cross section of the reflective surface 41 is not limited to a square, For example, a rectangle, a circle, etc. may be sufficient.

Further, as shown in FIGS. 2 and 5, the hollow portion 42 converges from the light modulation device 2 side toward the light source device 3 side. That is, the cylindrical reflection surface 41 converges from the liquid crystal panel 22 (light modulation element) side toward the light source device 3 side. In other words, the cylindrical reflection surface 41 is expanded from the light source device 3 side toward the liquid crystal panel 22 (light modulation element) side.
The light source device 3 described above is provided so as to cover an inner region of one end of the cylindrical reflection surface 41, and the liquid crystal panel (light modulation element) 22 described above is provided at the other end of the cylindrical reflection surface 41. It is provided so as to cover the inner region. A region surrounded by the cylindrical reflection surface 41, the light source device 3, and the liquid crystal panel 22 forms a closed region including the light source 31. Thereby, since the light reflected by the light shielding layer 213 (reflecting portion) is effectively used, a high-luminance and high-quality image can be displayed more reliably.

  Such a cylindrical reflection surface 41 allows light from the light source device 3 to enter from one end thereof and to be emitted to the other end. At this time, the cylindrical reflecting surface 41 reflects one or more times of light from the light source device 3 having a relatively large angle with respect to the optical axis OA. Further, as described above, since the cylindrical reflection surface 41 (light guide space) is expanded from the light source device 3 side toward the light modulation device 2 side, a relatively large angle is formed with respect to the optical axis OA. The light is converted into light having a relatively small angle with respect to the optical axis OA. Thereby, even if the light from the light source device 3 spreads greatly with respect to the optical axis OA, the light modulation device 2 can be irradiated with light with relatively little spread along the optical axis OA.

In particular, the cylindrical reflecting surface 41 reflects light reflected to the light guide member 4 side by the polarizing layer 24 and the light shielding layer 213 (reflecting portion) described above (hereinafter also referred to as “light reflected by the light modulation device 2”). The inclination angle θ with respect to the axis (optical axis OA) of the cylindrical reflecting surface 41 is 8 ° or more so as to lead to the opening 214 (translucent window).
If the tilt angle θ is 8 ° or more, the cylindrical reflection surface 41 can guide most of the light reflected by the light modulation device 2 (specifically, about 70% or more) to the liquid crystal panel 22 side. As a result, the amount of light to the opening 214 can be increased.
Thereby, since the light reflected by the light modulation device 2 is effectively used, it is possible to display a high-luminance and high-quality image while saving power.

In addition, light (remaining part) other than light guided to the liquid crystal panel 22 side (remaining part) among the light reflected by the light modulation device 2 is guided to the light source 31 of the light source device 3 by the cylindrical reflection surface 41.
As described above, in the light source device 3 using the light source 31 and the phosphor 32, the remaining light can be effectively used for excitation of the phosphor 32 provided in the vicinity of the light source 31. As a result, the brightness of the image can be improved.

  In this specification, the inclination angle θ refers to an angle with respect to the axis line (optical axis OA) of the reflection surface 41, and satisfies the above-described inclination angle θ over almost the entire circumferential direction of the cylindrical reflection surface 41. Say. In addition, the inclination angle θ is a value that satisfies the above-described inclination angle θ in substantially the entire axial direction of the cylindrical reflection surface 41. Further, the inclination angle θ may be constant or locally different in the axial direction of the cylindrical reflecting surface 41. Hereinafter, a case where the inclination angle θ is constant in the axial direction of the cylindrical reflecting surface 41 will be described.

As shown in FIG. 5A, the inclination angle θ _A with respect to the axis (optical axis OA) of the cylindrical reflecting surface 41 is 8 ° or more in the cross section along line _AA in FIG. Further, as shown in FIG. 5B, the inclination angle θ _B with respect to the axis (optical axis OA) of the cylindrical reflecting surface 41 is 8 ° or more in the cross section taken along line BB in FIG. Note that the inclination angle θ _A and the inclination angle θ _B may be the same as or different from each other.

  Such an inclination angle θ may be 8 ° or more, but is preferably 8 to 25 °, and more preferably 8 to 15 °. As a result, a high-luminance and high-quality image can be displayed more reliably.

In the present embodiment, the inclination angle θ is constant over substantially the entire region in the axial direction of the cylindrical reflecting surface 41. Thereby, the uniformity of the light irradiated to the liquid crystal panel 22 from the light source device 3 can be easily and surely displayed, and a high-quality image can be displayed.
Such a reflective surface 41 is not particularly limited as long as it can exhibit the functions as described above, but, for example, silver, aluminum, aluminum alloy, etc., similar to the light shielding layer (reflective portion) 213 described above. It is possible to use a metal, a dielectric multilayer film (optical multilayer film), or the like.

The projection lens 5 is a projection optical system composed of a lens group (not shown), and has a function of enlarging the image light that has passed through the light modulation device 3 at a predetermined magnification. Thereby, an image of a desired size can be projected and displayed on the screen S.
According to the display device 1 as described above, since the inclination angle θ with respect to the axis line (optical axis OA) of the cylindrical reflection surface 41 is 8 ° or more, it is guided by the polarizing layer 24 or the light shielding layer 213 (reflecting portion). The light reflected toward the optical member 4 can be effectively used to display a high-luminance and high-quality image while saving power.

The display device according to each embodiment as described above can be applied to electronic devices such as a projector device and a liquid crystal television (monitor). Such an electronic device can display a high-luminance and high-quality image while saving power.
As described above, the display device and the electronic apparatus of the present invention have been described based on the illustrated embodiment, but the present invention is not limited to this. For example, in the present invention, the configuration of each part can be replaced with any configuration that exhibits the same function, and any configuration can be added.

Further, the present invention may be a combination of any two or more configurations (features) of the above-described embodiments.
In the embodiment described above, the light source device uses a light source and a phosphor. However, in the present invention, the phosphor of the light source device can be omitted. In this case, for example, a light source such as a single color LED or LD is used. Furthermore, you may comprise so that it may become a different color light or substantially white light by the combination of the monochromatic LED etc. which have a several different wavelength.

In the above-described embodiment, the display of a full-color image has been described. However, the present invention can also be applied to a display of a single-color or two-color image. For example, it is possible to display an image of a single color or two colors by using a color filter having a single color or two color wavelength selection unit or omitting the color filter.
It is also possible to display a full color image by combining a plurality of display devices of different colors.

It is a perspective view which shows schematic structure of embodiment of the display apparatus concerning this invention. It is a longitudinal cross-sectional view (AA sectional view taken on the line in FIG. 1) of the display apparatus shown in FIG. FIG. 3 is a cross-sectional view illustrating a schematic configuration of the light modulation element illustrated in FIG. 2. It is sectional drawing which shows schematic structure of the light source device shown in FIG. 2A and 2B are schematic views for explaining the light guide member shown in FIG. 2 (FIG. 1A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 2B is a cross-sectional view taken along the line BB in FIG. 1).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Display apparatus 2 ... Light modulation device 21 ... Color filter 211 ... Substrate 212, 212R, 212G, 212B ... Wavelength selection part 213 ... Light-shielding layer (reflection part) 214 ... Opening (translucent window part) 22 ... Liquid crystal panel (light) Modulating element) 221 ... Substrate 222 ... Liquid crystal layer 223 ... Pixel electrode 224 ... Common electrode 225, 226 ... Light distribution film 229 ... Switching element 23, 24 ... Polarizing layer 25 ... Reflecting unit 3 ... Light source device 31 ... Light source 311 ... Light emitting unit 32 ... phosphor 33 ... support base 34 ... circuit board 341, 342 ... wiring 35 ... base member 4 ... light guide member 41 ... cylindrical reflection surface 42 ... hollow part 5 ... projection lens [theta], [theta] _A , [theta] _B ... tilt Angle S ... Screen OA ... Optical axis (axis)

Claims (12)

A light modulation element comprising a plurality of light-transmissive windows;
A light source device including a light source that emits light;
A light guide member including a cylindrical reflection surface having a function of guiding light from the light source toward the light modulation element;
Provided in the vicinity of the light source side of the light modulation element and / or in the light modulation element so as to correspond to a portion other than the light transmission window portion, and reflects light from the light guide member toward the light guide member side. And a reflective part
The cylindrical reflecting surface converges from the light modulation element side to the light source device side so as to guide light reflected by the reflecting portion to the light transmitting window portion, and the cylindrical reflecting surface A display device having an inclination angle θ with respect to an axis of 8 ° or more.   The light source device is provided so as to cover an inner region of one end of the cylindrical reflecting surface, and the light modulation element is provided so as to cover an inner region of the other end of the cylindrical reflecting surface, The display device according to claim 1, wherein a region surrounded by a cylindrical reflection surface, the light source device, and the light modulation element forms a closed region containing the light source.   3. The display device according to claim 1, wherein the inclination angle θ is constant over substantially the entire region in the axial direction of the cylindrical reflecting surface.   4. A polarization separation element that transmits polarized light in a predetermined direction and reflects polarized light in a direction orthogonal to the predetermined direction is provided between the light modulation element and the light source device. The display device described in 1.   The display device according to claim 4, wherein a retardation plate for controlling a polarization state is provided between the polarization separation element and the light source device.   6. A color filter having a plurality of wavelength selection units is provided in the vicinity of the light modulation element, and at least one of the wavelength selection units has a characteristic of reflecting light in an opaque wavelength band. The display apparatus in any one.   The display device according to claim 6, wherein the plurality of wavelength selection units include wavelength selection units of a plurality of different wavelength bands.   The display device according to claim 1, wherein the light modulation element includes a wiring, and the reflection portion is provided corresponding to the wiring and serves also as a light shielding layer that shields the wiring. .   The display device according to claim 1, wherein the light applied to the light modulation element is substantially white light.   10. The light source device according to claim 1, wherein the light source device includes a phosphor in contact with or near the light source, and the light source emits excitation light that excites the phosphor. The display device described in 1.   The display device according to claim 9 or 10, wherein a color temperature of substantially white light emitted from the light source device is 6500K or more.   An electronic apparatus comprising the display device according to claim 1.

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