JP2003140593A - Method and device for video display and light source unit for video display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for video display for displaying video with high dynamic resolution and high presence and a light source unit for the video display. SOLUTION: The video display device displays the video at a frame frequency, nearly equal to or above the ratio of the minimum resolution visual angle of the human eye and the maximum angular speed of the pursuit movement of the eyeball.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display method and device, and an image display light source device, and is suitable for application to, for example, a projection type image display device (projector device).

[0002]

2. Description of the Related Art Conventionally, in a video display device, a large number of still images are sequentially switched and displayed as a moving image. The number of image frames displayed by the video display device per unit time is called a frame frequency, a frame rate, or the number of frames.

For example, according to the broadcasting standard, NTSC (National
Television System Committee) frame frequency is 29.97 [Hz], BS (Broadcasting Satellite) digital broadcasting standard 1080p is defined as 59.94 [Hz], PC
(Personal Computer) VESA for display (Vide
o Electronics Standards Association)
The maximum for XGA is specified as 85 [Hz]. In addition, the movie film is 24 frames per second.

The display of a moving image on such a video display device utilizes apparent movement caused by the visual characteristics of the human eye. Therefore, the frame frequency and the like in such a video display device are specified so that they can be perceived as a natural moving image.

However, it is generally known that when an image is displayed at a low frame frequency, flicker (flicker) occurs on the screen and the reproduced image quality deteriorates. Therefore, for example, in the case of movies, as a measure to mitigate this flicker, 1
Light is emitted twice per frame. Also, in the case of the NTSC system, the frame frequency is as low as 29.97 [Hz], but in the 2: 1 interlace system, 1/2 frame is used for every 2 frames.
The occurrence of flicker is mitigated by displaying an image by interlaced scanning at double field frequency 59.94 [Hz].

On the other hand, in the BS digital broadcast standard 1080p format, 59.94 [Hz] progressive scanning enables the display of higher-definition and high-quality moving images while suppressing the occurrence of flicker.

In PC displays, the frame frequency (refresh rate) is set higher, and recently, it has been set to 85 [Hz] or higher. This is because flicker is likely to be felt when the PC display is used for still image display mainly for character display such as document processing.

The reason is generally explained as follows. That is, it is known that there are two types of photoreceptor cells existing in the human retina: cones and rods. The cones have the ability to perceive color and are densely distributed in the macula. Then, the cone has the highest resolved visual angle sensitivity near the fovea at the center thereof. The visual range of the macula is about 1 in terms of viewing angle.
Equivalent to [°]. On the other hand, rods are widely distributed in the retina and have no color discrimination ability, but respond to light and dark with high sensitivity. According to a report, the presence or absence of flicker was measured by injecting a light beam that blinks at an angle of about 30 ° with respect to the visual axis into the retina, and as a result, the visual response sensitivity of the rod is high in image contrast. In some cases, it will reach up to about 70 [Hz].

In applications such as graphic processing and document processing for displaying a still image, the viewpoint and the screen are close to each other, so that the screen viewing angle is large. As a result, since the screen image is projected over a wide area on the retina, it is received by the rods distributed in the peripheral portion, which is far away from the macula. Therefore, a frame frequency higher than that of flicker is perceived. Therefore, in order to reduce the flicker under the above-mentioned usage conditions on a PC display, 85
Higher frame frequencies above [Hz] will be adopted.

Thus, as a countermeasure against flicker, increasing the frame frequency is effective for improving the image quality.

[0011]

Recently, in recent years, HD
TV (High Definition Television) system and UXG
With the introduction of the A display, high resolution and high image quality of video are rapidly progressing in the fields of broadcasting and PC. Higher resolution due to the increase in the number of pixels will realize realistic images on a large screen, and is expected to make further progress in the future.

[0012] As described above, the dynamic resolution is a relatively new issue relating to the image quality on the long-distance road toward higher image quality and higher realism.

The dynamic resolution represents the resolution of an object image moving on the screen in a moving image, and is determined by several factors. One of them is the quality of the input image, which depends on the degree of blurring of each frame image. The other is a screen scanning method of a video device, which includes a beam scanning method, a line scanning method, a frame sequential scanning method, a frame frequency thereof, a sub-frame forming method for gradation display, and the like.

The problem of the dynamic resolution is, for example, the PA of a video signal.
It has been discussed as a problem of image quality in conversion between the L (Phase Alternation by Line) system and the NTSC system, and in image conversion from interlaced scanning to progressive scanning (for example, Kurita, Sugiura, NHK Giken R & D, No. 45). , 1997
May, pp.39-53, (1997)). In addition, as a problem closely related to the dynamic resolution, a false contour noise of a moving image in a PDP (Plasma Display Panel) (S.Mikosiba, et al,: SID'92
Digest, p.659, (1992)) has been discussed.

In order to eliminate such deterioration of the dynamic resolution, it is effective to increase the shutter speed at the time of image capturing in order to reduce the blurring or blurring of the input image.

However, when an image with little blurring or blurring is adopted as a frame image, a moving image displayed by a video system having a low frame frequency is perceived as an unnatural image in which the motion of a moving object is not smooth. It has been known. In fact, in a video shot of a fast-moving subject such as sports broadcasting with a high-speed shutter, the unnaturalness of the subject movement is often seen.

Usually, in the moving image display system according to the current format, a natural and smooth moving image display is obtained by shooting with a slower shutter speed. Further, in recent game machines, when creating a fast-moving image, motion blur is added to a combined still image image so that the image looks smooth when a moving image is displayed.

As described above, at present, due to format restrictions, a trade-off between natural and smooth moving image display and reduction in dynamic resolution cannot be avoided.

The present invention has been made in consideration of the above points, and it is possible to eliminate the restriction on the dynamic resolution of the current video display system and display a more realistic video with a higher dynamic resolution. An image display method and device, and a light source device for image display are proposed.

[0020]

In order to solve the above problems, the present invention provides, in a video display method, a frame frequency which is approximately equal to the ratio of the minimum resolved viewing angle of the human eye to the maximum angular velocity of the eyeball following movement, or Images are displayed at a higher frame frequency than that. As a result, according to this image display method, the image can be displayed at the resolution of the characteristic limit of the eye-following movement, so that the dynamic resolution of the displayed image can be significantly improved as compared with the conventional case.

According to the present invention, the image display device displays an image at a frame frequency substantially equal to or higher than the ratio of the minimum resolved viewing angle of the human eye to the maximum angular velocity of the eyeball following movement. I did it. As a result, with this image display device, an image can be displayed at a resolution that is the limit of the characteristic of eye-following movement, and therefore the dynamic resolution of the displayed image can be significantly improved compared to the conventional case.

Further, in the present invention, in the image display light source device, an image signal having a frame frequency substantially equal to or higher than the ratio of the minimum resolved viewing angle of the human eye to the maximum angular velocity of the eye tracking movement. On the basis of,
Provided is a modulated light generation unit that collectively generates modulated light for each scanning line in frame units, and a scanning unit that collectively scans the generated modulated light for each scanning line on a predetermined image display surface in frame units. I chose As a result, with this image display light source device, an image can be displayed at a resolution that is the limit of the characteristic of eye-following movement, and therefore the dynamic resolution of the displayed image can be significantly improved compared to the conventional case.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Principle As a method for solving the above-mentioned limitation on the dynamic resolution of the current video display system to realize a higher dynamic resolution and a more realistic video display, a high frame frequency is used. Is effective. Therefore, the optimum condition of the frame frequency will be examined below.

(1-1) Following Movement As a clue for examining the frame frequency, it is important to consider the following movement of the human eyeball.

It is known that human eye movements are roughly classified into two types, saccades and follow-up movements. First, saccade is a movement that instantly moves a viewpoint from one gazing point to another gazing point, and it appears in the movement of the eyes in the case of checking what is called a glance. The angular velocity of eye movement at that time is known to reach up to 700 degrees per second (eg, Ishiyama, Yamada, Isono, NHK Giken R & D, No.4).
3, November 1996, pp.1-9, (1996)). It is known that the follow-up movement is a movement of an eyeball that continuously follows a moving object and is about 30 degrees per second at the maximum.

The maximum angular velocity of this follow-up motion can be understood as the maximum angular velocity that can follow the moving object while being caught by the macula. Therefore, for an object that moves at an angular velocity higher than this, it is difficult for the eyeball to continuously follow and move, and the image projected on the retina of the moving object inevitably blurs with respect to the retina. If so, the dynamic resolution will be reduced.

(1-2) Minimum resolution visual angle The minimum resolution visual angle of the human eye is 0.5 minutes, and the minimum resolution length is a visual distance of 30.
It is said to be 80 [μm] in the range of [cm] to 50 [cm] (see, for example, Display Advanced Technology, Kyoritsu Shuppan, (1998)).

The minimum resolution visual angle, so-called visual acuity, is usually measured by a method in which a subject looks at a Landolt ring from a position of 5 [m]. According to the measurement, the visual acuity of 1.0 is obtained when the cut of the ring with a viewing angle of 1 minute is seen, and the visual acuity is 2.0 when the cut of the ring with the viewing angle of 0.5 is seen. Its minimum resolved viewing angle is
It is said to correspond to the viewing angle determined by the interval of two cones distributed in the fovea centralis.

(1-3) Minimum Frame Frequency Now, consider a case where an observer follows a moving image of a moving object projected on a screen with his / her eyes. At this time, the moving image is displayed by sequential scanning at a frame frequency of 60 per second,
It is assumed that a moving object moves at an angular velocity of 30 degrees per second from the observer's viewpoint.

In that case, the contour of the object is 0.5 for each frame.
Move the display position about once. And at this time the observer
Perceived as double contour. For example, it is common to see the displayed pointer double when the pointer of a moving mouse is tracked on a PC monitor.

Therefore, the minimum frame frequency necessary for eliminating the double contour will be considered. In the following, regarding the size of the unit pixel of the display, it is assumed that the viewing angle of a single pixel from the viewpoint of the observer is equal to the minimum resolution viewing angle of the observer's visual acuity.

Consider a case where an object moves on the screen at the fastest following speed. When the moving distance of each frame of an object corresponds to the size of one pixel, it is expected that the image projected on the cones distributed in the macular fovea on the retina has the highest contrast. It is inferred from the description of the measurement target.

Here, consider the case where the object moves at the maximum angular velocity of the follow-up motion of 30 degrees per second. If the moving speed is higher than this speed, the human eye cannot follow the object without reducing the dynamic resolution. Therefore, when it is assumed that the video display has high dynamic resolution and high sensation of reality, it is sufficient to discuss at the maximum speed of the tracking motion.

When an object moving at the highest angular velocity of the following motion is followed, the image of the object moving at a frame frequency obtained by dividing the angular velocity by the minimum resolution viewing angle is displayed to achieve the condition for maintaining such contrast. Therefore, it can be perceived as a display with high fidelity.

When an object moves at a maximum angular velocity of 30 degrees per second with a minimum resolving visual angle of 0.5 minutes, its frame frequency is 3.6 [kHz]. In a display system that displays images at such a high frame frequency, a viewer looking from a point of view where the angle at which a unit pixel is viewed is equal to the minimum resolution angle, an observer who sees an object moving at or below the maximum angular velocity of the eye-following movement has a resolution unique to the frame image. It becomes possible to perceive. In other words, the resolution when a person looks at a moving object displayed in a frame on the screen, that is, the dynamic resolution can be improved to the resolution at which a still frame image is viewed, that is, the static resolution level.

(1-4) Current video display system However, in the conventional video display system, HDTV
It is difficult to display such a high-definition image at a high frame frequency of 3.6 [kHz].

For example, in a CRT (Cathode Ray Tube), a fluorescent screen is scanned with an electron beam to convert a video signal into light and display a video. In this case, the electron beam starts scanning horizontally from the upper left corner of the screen, repeats horizontal scanning for one frame, and reaches the lower right corner of the screen. Then, using the blanking period, the robot returns to the upper right position and prepares for scanning the next frame. This blanking period is about 1 [msec] in the case of the NTSC system. When increasing the frame frequency, it is necessary to shorten the scanning time for each frame and, at the same time, greatly reduce the blanking period. In that case, first, a technical obstacle is to cope with the speedup of the deflection yoke drive circuit.

In an LCD (Liquid Crystal Display), the switching response time of a liquid crystal pixel cell is usually 10
Since it is about [msec], image display at a high frame frequency of 3.6 [kHz] cannot be supported at present due to the characteristics of the liquid crystal element.

The DMD (Digital Micromirror Device) display is a new spatial modulation element in which micromirrors are arranged in a two-dimensional array on a silicon IC. The light emitted from the light source is uniformly applied to the surface of the micromirror, the reflected light is spatially modulated by the mirror inclination, and an image is projected and displayed on the screen. The switching time of the micromirror is about 10 [μsec]. It is three orders of magnitude faster than liquid crystal devices. The gradation display method uses pulse width modulation. In the current format display, sufficiently high quality video is realized. However, when applied to video display with a high frame frequency of 3.6 [kHz], the switching speed of the micromirror is a constraint, so the display gradation is insufficient at present and high-quality video display is impossible. .

As a new technology, GLV (Grating Light
Attention is being paid to displays that use t Valve. G
The LV is a spatial light modulator that utilizes the interference effect of light. For example, a projection type display including a one-dimensional array type GLV, a frame scanning system and a projection optical system has been reported. GLV features 20 switching times.
It is even faster with [nsec]. The gradation display method is
Both analog modulation and pulse width modulation are applicable.
GLV displays take advantage of their high-speed responsiveness, and
It is possible to support a frame frequency of about 120 [Hz] with a resolution equivalent to DTV. However, the GLV display is not sufficient at present to be applied to image display at a high-speed frame frequency of 3.6 [kHz].

As described above, the possibility of applying the typical current image display system to the high-speed frame frequency for realizing the dynamic resolution of the characteristic limit of the eye-following movement has been examined, but it is difficult to realize any of them. I understood. Therefore, the contents of the image display system according to the present invention, which is operable at a high frame frequency and enables the dynamic resolution of the characteristic limit of the eye tracking movement, will be described in detail below.

(2) Regarding the video display system of the video display system according to the present embodiment, as shown in FIG. 1, a person is projected on the screen 1 at a certain distance (hereinafter referred to as a visual distance) L. Consider the case of watching a video. In the following, the image is the distance α
It is assumed that it is formed by a group of a large number of pixels p which are sequentially arranged in a two-dimensional array with an interval of.

[0044] In the embodiment of the present embodiment, when viewed each pixel p on the screen 1 from the position of the viewer an image, the maximum viewing angle per pixel thereof theta, a minimum degradation viewing angle of the eye 2 theta _{r es} As

[0045]

[Equation 1]

As described above, the viewing distance L is set so that the maximum viewing angle θ per pixel is substantially equal to or smaller than the minimum resolution viewing angle θ _res of the eye 2.

For example, assuming that the maximum viewing angle θ is given to the pixel p whose visual axis is orthogonal to the screen 1,
L satisfying the formula (1) is expressed by the following formula.

[0048]

[Equation 2]

Is given by As a specific example, α = 0.5 [m
In the case of [m], L ≧ 3.4 [m]. In the following, this equal sign shall hold.

The frame frequency for realizing a high dynamic resolution and highly realistic image display is a frequency of 3.6 [kHz] or higher, which is determined from the minimum resolving visual angle and the maximum velocity of the eyeball following motion as described above.

Generally, the minimum resolved viewing angle of a person changes depending on the illumination condition of the environment. Therefore, the frame frequency that realizes a high dynamic resolution display adaptively changes with respect to the minimum resolution viewing angle depending on the illumination condition of the image display environment.

For example, when the illumination condition is made brighter than the visual acuity measurement condition, the resolved visual angle is considered to be limited by the distribution density of the cone cells on the retina, and the frame frequency is 3.6 [kHz].
There is no change. On the other hand, it is known that when the lighting condition is made darker, the decomposition ability is lowered. In that case, the minimum resolution viewing angle is large, so the frame frequency is
Reduced from 3.6 [kHz]. Even in such a case, the image display system with the frame frequency of 3.6 [kHz] can provide the dynamic resolution adapted to the viewing angle characteristics of the human eye. Alternatively, the frame frequency of the video system may be lowered from 3.6 [kHz].

(3) Configuration of Projection Display Device 10 According to this Embodiment FIG. 2 shows the projection display device 10 according to this embodiment, and is supplied with a high frame frequency (for example, 3.6.
A color image light beam L1 based on the color image signal S1 of [kHz]) is generated and projected onto the image display surface 11A of the screen 11, thereby displaying a color image having a high frame frequency based on the color image signal S1. 11 can be displayed.

That is, in the projection type display device 10,
The supplied color video signal S1 is separated into a video color signal S2 and a synchronizing signal S3 in the signal separating unit 12, and the video color signal S2 is input to the light source driving unit 13 and the synchronizing signal S3 is inputted.
Is input to the scan driver 14.

The light source driving section 13 is effective for each of the red (R), green (G) and blue (B) color components of the color image based on the supplied image color signal S2 based on the supplied image color signal S2. Drive signals S3R, S3G for each scanning line,
S3B is collectively generated for each frame, and drive signals S3R and S3 for each color component and each effective scanning line are generated.
G and S3B are sent to the multicolor array type light source unit 15 in parallel in frame units.

In the multicolor array type light source unit 15, red, green or blue light beams corresponding to the number of effective scanning lines are respectively made to correspond to the red component, the green component and the blue component of the color image, and the optical axes thereof are set. High-speed modulated first to third array type laser light sources 15R, 15 capable of emitting while maintaining parallel
G and 15B are provided.

The first to third array type laser light sources 15R, 15G and 15B are respectively provided in the light source drive unit 1.
3 corresponding drive signals S3R, S3G, S
Driven based on 3B, the modulated light beams L2R, L2G, and L2B generated by modulating and generating the corresponding color components (red component, green component, or blue component) for each effective scanning line are emitted. The driving method of the first to third array type laser light sources 15R, 15G and 15B at this time is as follows.
Various modulation methods such as a pulse width modulation driving method or a light intensity modulation driving method can be used.

At this time, the array type optical amplifying section 16 is made to correspond to the first to third array type laser light sources 15R, 15G and 15B in the multicolor array type light source section 15 respectively.
-Third array type optical amplifiers 16R, 16G and 16B are provided. The first to third array type optical amplifiers 16R, 16G and 16B are modulated light beams L2R, L2G and L2B emitted from the corresponding first to third array type optical amplifiers 16R, 16G and 16B. The light is received, and the light is amplified and emitted.

The modulated light beams L3R, L3G, L3B emitted from the first to third array type optical amplifiers 16R, 16G, 16B are then incident on the optical coupling section 17 and the optical coupling section 17 concerned. In, the components of the respective color components corresponding to the same scanning line are combined so as to overlap each other on the same optical axis. As a result, a color image light beam L1 composed of spatially modulated light for each effective scanning line of the color image based on the color image signal S1 is generated and is incident on the frame scanning unit 18.

The frame scanning unit 18 has an optically flat reflecting mirror such as a polygon rotating mirror or a galvano mirror capable of high-speed deflection, and an actuator for vibrating or rotating the reflecting mirror. On the basis of the scan drive signal S4 given from 14, the color image light beam L1 is deflected so as to scan (horizontal scan) from the right end to the left end of the screen 11 in synchronization with the incidence of the color image light beam L1 for one frame. To do.

As a result, every time the color image light beam L1 deflected by the frame scanning unit 18 scans from the right end to the left end of the screen 11, a color image for one frame is sequentially displayed, which is a frame of the color video signal S1. Done in frequency.

At this time, the frame scanning section 18 is used to adjust the color image light beam L1 by converging or narrowing it so that the color image light beam L1 is appropriately converged and projected on the screen 11. An optical processing system (not shown) is appropriately provided.

In this way, in the projection type display device 10, a color image based on the supplied color image signal S1 can be projected and displayed on the screen 11.

(4) Detailed Configuration of Main Parts of Projection Display Device 10 Next, the first to first main parts of the projection display device 10 will be described.
Third array type laser light sources 15R, 15G, 15B,
First to third array type optical amplifiers 16R, 16G, 16B
The configuration will be described in detail.

(4-1) Detailed Configuration of First to Third Array-Type Laser Light Sources 15R, 15G, and 15B In the case of the projection display device 10, the first to third array types of the multicolor array-type light source unit 15 are used. Laser light sources 15R, 15G, 15
In B, as shown in FIG.
A condenser lens array 21, a half mirror array 22, and a light absorber array 23 are integrally laminated in this order on the upper side.

In this case, in the light emitting element array 20, as shown in FIG. 4, 10 × n semiconductor lasers, VCSELs (Vertical Cav) are provided on the monolithic semiconductor substrate 30.
light emitting elements 31 capable of high-speed direct light modulation such as a surface emitting LED) or a surface-emitting LED or an organic LED and having excellent monochromaticity are arranged and formed in a two-dimensional array. It is configured by being electrically connected to a corresponding drive element (not shown). Here, n represents the number of effective scanning lines or the number of effective pixels, for example, 490 in the case of the NTSC system,
In the case of BS digital 1080p, the number is 1080.

In the case of this light emitting element array 20, ten light emitting elements 31 arranged in the row direction (the arrow x direction and the opposite direction) correspond to one scanning line, and these ten light emitting elements are arranged. The light beams modulated and generated based on the drive signals S3R, S3G, and S3B from the corresponding drive elements, which are respectively emitted from 31, are combined as described below, and one modulated light corresponding to one scanning line is generated. Beams L2R, L2G, L
2B is formed.

The light emitting elements 31 are formed at substantially equal intervals by a lithography process or the like. In the case of this embodiment, the size of the light emitting region of each light emitting element 31 is about 10 [μ
m], and the interval is about 20 [μm]. In such a high-density array mounting, since the light amplification function is used, the light emitting element 31
This can be achieved by reducing the light output from the microwatt (μW) level. As a result, heat generation from the light emitting elements 31 is suppressed, and effects such as relaxation of mounting conditions of the light emitting elements 31, reduction of thermal interference between the light emitting elements 31, and improvement of the operating life of the light emitting elements 31 are expected. .

In the condensing lens array 21, two light emitting elements 31 of the light emitting element array 20 are associated with each other.
It has 10 × n condensing lenses 32 arranged in a dimensional array, and each condensing lens 32 is located directly above the radiation axis direction (arrow z direction) of the light beam of the corresponding light emitting element 31. Thus, it is positioned and fixedly arranged on the issuing element array 20.

As a result, in the condenser lens array 21, the light beams emitted from the respective light emitting elements 31 of the light emitting element array 20 are converted into parallel light by the corresponding condenser lenses 32, and thus the respective light beams after this are converted. These light beams can be efficiently combined when they are combined.

In the case of this embodiment, the condenser lenses 32 of the condenser lens array 21 are integrally molded so as to be mechanically coupled to each other, whereby the mechanical strength is enhanced and the position during alignment is increased. It is possible to expect effects such as improvement in accuracy and suppression of change over time.

The half mirror array 22 has a plurality of half mirrors 33 arranged at the same intervals as the intervals between the light emitting elements in the light emitting element array 20, and each of the half mirrors 33 corresponds to the corresponding light emitting element 31. Is positioned and fixedly arranged on the condenser lens array 21 so that the light beam of is positioned on the optical axis condensed by the corresponding condenser lens 32.

In this case, each half mirror 33 is formed with an inclination of 45 [°] with respect to the optical axis of the light beam from the light emitting element 31 condensed by the condenser lens 32. The light beams emitted from the respective light emitting elements 31 of the light emitting element array 20 by the mirror 33 go straight along the incident optical axis and the same propagation direction on the same predetermined optical axis parallel to the arrow x ( It can be separated in two directions (arrow x direction).

Further, at this time, the distribution ratio of the light beam in each half mirror 33 (that is, the transmittance of the light beam in the half mirror 33) is selected to be approximately 50%, whereby the light reflected in the arrow x direction is selected. The beam power can be sequentially combined with other light beams reflected in the same propagation direction on the same optical axis while the beam power is sequentially reduced by half by the half mirror 33.

In the case of this embodiment, the half mirror array 22 is formed by adhering a plurality of optical glasses 34 coated with the half mirror 33 by adhesion, whereby the half mirror array 22 is formed.
It is possible to expect effects such as improvement in mechanical strength as a whole, improvement in positional accuracy during alignment, and suppression of change over time.

On the other hand, in the light absorber array 23, the light absorbers 36 containing a black pigment or the like are formed in a two-dimensional array on one surface side of the monolithic substrate 35 so as to correspond to the respective light emitting elements 31. It is configured.

In this case, the position of each light absorber 36 is from the corresponding light emitting element 31 to the corresponding condenser lens 32.
And are selected so as to be located on the optical axis of the light beam that is sequentially incident through the half mirror 33. As a result, the first to third array type laser light sources 15R, 15G, 15B
, The half mirror 3 of the half mirror array 22
By absorbing the light beam that has passed through 3 in the corresponding light absorber 36 of the light absorber array 23, noise due to stray light can be reduced.

The monolithic substrate 35 in the light absorber array 23 is formed of a material having a high thermal conductivity, so that the heat generated by the light absorber 36 absorbing the light beam can be efficiently transferred to the outside. It is designed to prevent the occurrence of defects due to the influence of the heat.

Next, the combination of the light beams emitted from the respective light emitting elements 31 of the light emitting element array 20 in the first to third array type laser light sources 15R, 15G and 15B will be described. In the following description, the initial value of the optical power of the light beam emitted from the light emitting element 31 is set to 4 units for easy understanding of the description.

As shown in FIG. 5, in the first to third array type laser light sources 15R, 15G and 15B, the first light beam emitted from one first light emitting element 31 is of optical power. Two units are reflected by the corresponding first half mirror 23 in the half mirror array 22, travel to the second half mirror 23 adjacent in the arrow x direction, and the remaining two units are the first half mirror. After passing through 33, the light absorber 36 is absorbed by the corresponding light absorber 36 in the light absorber array 23.

Then, the first light beam with the optical power of 2 units directed to the second half mirror 33 is transmitted by one unit of the optical power in the second half mirror 33, and goes straight.
The remaining one unit is reflected and absorbed by the corresponding light absorber 36 in the light absorber array 23.

Similarly, the second light beam emitted from the second light emitting element 31 adjacent to the first light emitting element 31 in the direction of arrow x is equivalent to 2 units of the optical power of 4 units. Is reflected by the second half mirror 33 toward the third half mirror 33 adjacent in the direction of the arrow x, and the remaining two units are transmitted straight through the second half mirror 33 and go straight in the light absorber array 23. Is absorbed by the light absorber 36. Therefore, the power of the light beam directed to the third half mirror 33 becomes a combined light beam of 3 units.

As described above, when the powers of the light beams are repeatedly combined and all 10 light emitting elements 31 are turned on, the maximum power is 4 units- ^2-8 units. Therefore, the first to third array type laser light sources 15 according to this embodiment
In case of R, 15G, 15B, 10 corresponding to one scanning line
By arbitrarily combining ON / OFF of the individual light emitting elements 31, it is possible to perform gradation display of 1023 gradations.

Such parallel processing enables color display with high frame rate, high resolution and high bit, and the modulated light beams L2R, L2G, L thus obtained.
2B is supplied to the corresponding first to third array type optical amplifiers 16R, 16G and 16B of the optical amplifier 16.

(4-2) Detailed Structure of First to Third Array Type Optical Amplifiers 16R, 16G and 16B On the other hand, the first to third array type optical amplifiers 16R, 16G and
In 16B, it is configured as shown in FIG.
Corresponding first to third array type laser light sources 15R, 15
The modulated light beams L2R, L2G, and L2B, which are emitted from G and 15B and are spatially one-dimensionally expanded for the number of effective scanning lines,
The coupling optical system 40 and the optical filter 41 that transmits only the wavelength light of the light beam are sequentially introduced into the optical gain medium 42.

The optical gain medium 42 has a pumping light source 43.
The excitation light beam L10 having the first wavelength emitted from the laser beam is made uniform in intensity distribution in the light density uniformizing optical system 44, and then is sequentially incident through the dichroic mirror 45 and the optical filter 41. As the pumping light beam L10, a semiconductor laser or a solid-state laser, which is wavelength-matched in the vicinity of the wavelength where the optical absorption cross-section of the doped dopant doped in the optical gain medium 42 is maximum or sufficiently large as described later, is used.

The optical gain medium 42 has a function of amplifying the incident modulated light beams L2R, L2G, L2B corresponding to the number of effective scanning lines while maintaining their spatial mutual positional relationship, as shown in FIG. In addition, the excitation light beam L10 (solid line) is absorbed, and the light having the same wavelength as the modulated light beams L2R, L2G, and L2B emitted from the corresponding first to third array type laser light sources 15R, 15G, and 15B (broken line). Doped to emit.

Thus, each of the modulated light beams L2R, L2G, L2B incident on the optical gain medium 42 is amplified to a predetermined intensity according to the gain of the optical gain medium 42 in the optical gain medium 42, and then the optical filter 41. The light enters the optical coupling portion 17 through the optical filter 46 having the same optical characteristics as.

The optical gain medium 4 having the reflection distribution is formed.
From 2, it is known that light emission occurs due to the spontaneous emission process. A part of this light is the modulated light beam L2.
As with R, L2G, and L2B, they propagate through the optical gain medium 42 and are amplified. This propagation amplified light L11 (FIG. 6) is called ASE (Amplified Spontaneous Emission, natural amplified light), and is modulated light beams L2R and L2.
It becomes a noise component for G and L2B.

Therefore, in this embodiment, as shown in FIG. 6, the ASE component propagating in the same direction as the modulated light beams L2R, L2G, L2B generated in the optical gain medium 42 is passed through the optical filter 46. The ASE component propagating in the opposite direction to the modulated light beams L2R, L2G, and L2B is guided by the light absorber 47 and absorbed by the light absorber 47 to be removed.
The optical filter 41 and the dichroic mirror 45 on the incident end side of 2R, L2G, and L2B are sequentially guided to the light absorber 48 and absorbed by the light absorber 48 to be removed.

Here, in practice, the optical gain medium 42 is composed of an optical amplification active region 50, an optical confinement layer 51 and a coating 52, as shown in FIG. The light amplification active region 50 is provided with the modulated light beams L2 from the corresponding first to third array type laser light sources 15R, 15G, 15B.
It has a high layer composed of a fiber-shaped optical amplification channel 53 provided corresponding to R, L2G, and L2B, and an optical amplification channel separation layer 54. This structure forms a continuous structure that is continuous from the entrance end surface to the exit end surface of the optical gain medium 42, and thereby enables the mutual positional relationship between the modulated light beams L2R, L2G, and L2B to be maintained at the entrance end surface.

The optical amplification channel 53 is provided with the modulated light beam L2.
It is formed by doping a material that is optically transparent to R, L2G, L2B and the excitation light beam L10 with a dopant that absorbs the excitation light beam L10 at an appropriate concentration. The dopant has a large absorption cross section in the wavelength band of the excitation light beam L10, and the modulated light beams L2R, L2G,
A material that has a large emission cross section in the L2B wavelength band and is capable of unique electronic transition is used.

The optical amplification channel 53 is excited by the excitation light beam L10 and modulated light beams L2R, L2G, L.
It has a function of guiding the modulated light beams L2R, L2G, L2B incident on its incident end face to its outgoing end face while amplifying 2B. For example, an acrylic organic material doped with an organic dye or a rare earth ion is used. , PMMA or frosted glass can be applied.

The optical amplification channel separation layer 54 and the optical confinement layer 51 are used for the modulated light beam L2 propagating in the optical gain medium 42.
Of the R, L2G, L2B and the pumping light beam L10, at least the modulated light beams L2R, L2G, L2B are confined in the optical amplifying channel 53 and the adjacent optical amplifying channels 53.
It has a function of blocking the crosstalk of the signal of, thereby realizing highly efficient optical signal amplification, and
The modulated light beams L2R, L2G, and L2B can be guided while maintaining the relative positional relationship at the incident end face to the emitting end face of the optical gain medium 42.

The interval pitch of the optical amplification channels 53 of the optical gain medium 42 depends on the modulated light beams L2R, L2G, L.
The pitch is selected to be a pitch of 2B or a fraction thereof, so that the spatial resolution can be maintained.

(5) Operation and effects of the present embodiment With the above configuration, in this projection type display device 10, as shown in FIG. 9, the supplied frame frequency is 3.6 [kHz].
Of the video signal S1 of
2 and a sync signal S3, and based on the video color signal S2, the light source drive unit 13 collectively generates drive signals S3R, S3G, and S3B for each effective scanning line for each color component on a frame-by-frame basis. Signals S3R, S3
The first to the first multicolor array light source units 15 based on G and S3B
The third array type laser light sources 15R, 15G and 15B are driven.

The modulated light beams L2R, L2G and L2B emitted from the first to third array type laser light sources 15R, 15G and 15B are respectively supplied to the first to third corresponding array type optical amplifiers 16. Array type optical amplifier 16
Optical amplification is performed in R, 16G, and 16B, and then these are combined in the optical combining unit 17 to generate a color image light beam L1 for each scanning line of one frame.

Further, the color image light beam L1 for each scanning line is projected on the image display surface of the screen 1 while being deflected by the frame scanning section 18 thereafter. As a result,
A color image having a frame frequency of 3.6 [kHz] based on the color image light beam L1 is displayed on the image display surface of the screen 1.

Therefore, in this projection type image display device 10, the frame frequency (3.6 [kHz]) is approximately equal to the ratio of the minimum resolved viewing angle of the human eye to the maximum angular velocity of the eyeball following movement.
Since the image is displayed with, the image can be displayed with the resolution of the characteristic limit of the eye-following movement, and thus the image with a high sense of presence can be displayed with a high dynamic resolution.

Further, in this projection type image display device 10, when displaying an image at such a frame frequency, the first to third array type laser light sources 15 of the multicolor array type light source section 15 are used.
The light emitting elements 31 arranged two-dimensionally in R, 15G, and 15B are simultaneously driven to modulate the modulated light beam L2 for each scanning line.
Since R, L2G, and L2B are generated, it is possible to achieve high quality and high definition of the displayed image while practically sufficiently supporting the image display at the high frame frequency.

Further, in this projection type image display device 10,
The modulated light beams L2R, L2G, and L2B emitted from the first to third array type laser light sources 15R, 15G, and 15B of the multicolor array type light source unit 15 respectively correspond to the first to the corresponding ones of the array type optical amplification unit 16. Third array type optical amplifier 16
Since the light is amplified in R, 16G, and 16B, it is possible to improve the energy efficiency and operate with less power.

Actually, for example, the resolution of HDTV is taken as an example, and concrete numerical values are shown, the first to third array type laser light sources 1 are shown.
1080 × 10 of 5R, 15G, 15B light emitting element array 20
As a two-dimensional array element of elements, the optical output of the modulated light beams L2R, L2G, and L2B corresponding to one scanning line is 2 [μW],
Each color video signal light L1 with optical amplification gain of 27 [dB]
Output is 1.08 [W], and the total of the three primary colors is about 3 [W].
It is possible to display a sufficiently bright image on a 0-inch large screen.

Further, in this case, the total light output of the multicolor array type light source section 15 is as small as about 22 [mW], so that low power consumption operation is possible, and further, as a deflecting means in the frame scanning section 18, a 24-sided polygon mirror is used. By rotating the 9000 at 9000 [rpm], it is possible to scan at 3.6 [kHz] with low power consumption.

Further, in this projection type image display device 10,
By making the multicolor array type light source unit 15 monolithic and adopting the array type optical amplification unit 16 as described above, it is possible to reduce the size of the entire device and improve the reliability.

According to the above configuration, the image is displayed at the frame frequency (3.6 [kHz]) which is approximately equal to the ratio of the minimum resolved visual angle of the human eye to the maximum angular velocity of the eyeball following movement. The image can be displayed at the resolution of the characteristic limit of the eye-following movement, and thus, the image with high dynamic resolution and high sensation of reality can be displayed.

(6) Other Embodiments In the above embodiment, the frame frequency is set to 3.
Although the case has been described as 6 (kHz), the present invention is not limited to this, the point is that the frame frequency is approximately equal to the ratio of the minimum resolved viewing angle of the human eye and the maximum angular velocity of the eyeball following movement. Alternatively, if the frame frequency is higher than that, the frame frequency may be a value other than 3.6 [kHz]. Also, if the minimum resolved viewing angle of the human eye under the lighting conditions of the viewing environment is also taken into consideration, the frame frequency is
It may be a value smaller than 3.6 [kHz].

In the above-described embodiment, the first to third array type laser light sources 1 of the multicolor array type light source unit 15 are used.
The light emitting element array 20 in 5R, 15G, and 15B is
The case where the light emitting elements 31 are arranged in a two-dimensional array has been described. However, the present invention is not limited to this. For example, the light emitting elements 31 are one-dimensionally associated with effective scanning lines of one frame. You may make it the structure arrange | positioned at array form.

Further, in the above-mentioned embodiment, in the light emitting element array 20 of the first to third array type laser light sources 15R, 15G and 15B of the multicolor array type light source section 15, one effective scanning line is set. Although the case where ten light emitting elements 31 are provided has been described above, the present invention is not limited to this, and the number may be less than or more than ten.

Further, in the above-described embodiment, based on the video signal having the frame frequency substantially equal to or higher than the ratio of the minimum resolved visual angle of the human eye and the maximum angular velocity of the eye tracking movement, First to third array type laser light sources 15 as modulated light generating means for collectively forming the color image light beam L1 for each scanning line in frame units.
Although the case where R, 15G, and 15B are configured as shown in FIG. 3 has been described, the present invention is not limited to this, and various other configurations can be widely applied.

Further, in the above-described embodiment, the screen scanning unit 18 as a scanning unit for collectively scanning the image display surface 11A of the screen 11 on a frame-by-frame basis by the batch-generated color image light beam L1 for each scanning line is a polygon. A case has been described in which an optically flat reflecting mirror such as a rotating mirror or a galvanometer mirror capable of high-speed deflection, an actuator for vibrating or rotating the reflecting mirror, and a scan driving unit 14 are used. The invention is not limited to this, and various other configurations can be widely applied.

Further, in the above-described embodiment, the first
~ Modulated light beam L2R for each scanning line collectively generated by the third array type laser light sources 15R, 15G, 15B,
The first to the first as optical amplification means for optically amplifying L2G and L2B
The case where the third array type optical amplifiers 16R, 16G and 16B are configured as shown in FIG. 6 has been described.
The present invention is not limited to this, and various other configurations can be widely applied.

In this case, as shown in FIG. 10 in which the first to third array type optical amplifiers 16R, 16G and 16B have the same reference numerals as those in FIG. 6, the pumping light beam L10 is optically transmitted. The modulated light beams L2R, L2G, and L2B in the gain medium 42 may be configured to be incident from the emission end side, and further, as shown in FIG. Light beam L10
Are modulated light beams L2R and L2 in the optical gain medium 42.
The light may be incident from both the incident end side and the emission end side of G and L2B.

[0113]

As described above, according to the present invention, in the image display method, the frame frequency which is approximately equal to the ratio of the minimum resolved viewing angle of the human eye to the maximum angular velocity of the eye tracking movement, or a frame frequency higher than that. By displaying the image at the frequency, it is possible to display the image at the resolution of the characteristic limit of eye tracking movement, thus realizing a video display method that can display a more realistic image with higher dynamic resolution. it can.

In the present invention, the image display device displays an image at a frame frequency substantially equal to or higher than the ratio of the minimum resolved viewing angle of the human eye to the maximum angular velocity of the eyeball following movement. By doing so, it is possible to display an image with a resolution that is the limit of the characteristic of eye-following movement, and thus it is possible to realize an image display device that can display a more realistic image with a higher dynamic resolution.

Further, according to the present invention, in the image display light source device, an image signal having a frame frequency substantially equal to or higher than the ratio of the minimum resolved viewing angle of the human eye to the maximum angular velocity of the eye tracking movement. On the basis of,
Provided is a modulated light generation unit that collectively generates modulated light for each scanning line in frame units, and a scanning unit that collectively scans the generated modulated light for each scanning line on a predetermined image display surface in frame units. By doing so, it is possible to display the image at the resolution of the characteristic limit of eye tracking movement,
Thus, it is possible to realize a video display light source device capable of displaying a video with a higher dynamic resolution and a higher sense of presence.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining a video display system according to an embodiment.

FIG. 2 is a block diagram showing a configuration of a projection type display device according to the present embodiment.

FIG. 3 is a side view showing a configuration of first to third array type laser light sources.

FIG. 4 is a plan view showing a configuration of a light emitting element array.

FIG. 5 is a conceptual diagram for explaining multiplexing coupling in first to third array type laser light sources.

FIG. 6 is a block diagram showing a configuration of first to third array type optical amplifiers.

FIG. 7 is a characteristic curve diagram showing light absorption and fluorescence characteristics of a dopant.

FIG. 8 is a sectional view showing the structure of an optical gain medium.

FIG. 9 is a conceptual block diagram for explaining the operation of the projection display apparatus according to the present embodiment.

FIG. 10 is a block diagram showing another embodiment.

FIG. 11 is a block diagram showing another embodiment.

[Explanation of symbols]

10 ... Projection type image display device, 11 ... Screen, 1
1A ... Image display surface, 13 ... Light source driving section, 15 ... Multicolor array type light source section, 15R, 15G, 15B ... Array type laser light source, 16 ... Array type optical amplification section, 16R, 1
6G, 16B ... Array type optical amplifier, 17 ... Optical coupling section, 18 ... Frame scanning section, 20 ... Light emitting element array, 21 ... Condensing lens array, 22 ... Half mirror array, 23 ... Optical Absorber array, 31 ... Light emitting element,
32 ... Condensing lens, 33 ... Half mirror, 36, 4
7, 48 ... Optical absorber, 42 ... Optical gain medium, 43 ...
... excitation light source, 50 ... light amplification active region, 51 ... light confinement layer, 52 ... coating, 53 ... light amplification channel, 54 ...
... Optical amplification channel separation layer, L1 ... Color image light beam, L2R, L2G, L2B, L3R, L3G, L3B
...... Modulated light beam, S1 …… Color video signal, S3R,
S3G, S3B ... Drive signal.

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) H01S 5/40 H01S 5/40 H04N 5/74 H04N 5/74 H

Claims (46)

[Claims] 1. An image at a first frame frequency which is approximately equal to the ratio of the minimum resolved viewing angle of the human eye to the maximum angular velocity of the following movement of the eyeball, or a second frame frequency higher than the first frame frequency. An image display method characterized by displaying. 2. The first frame frequency is approximately 3.6 [k
Hz]. The image display method according to claim 1, wherein 3. A first step of collectively generating modulated light for each scanning line on a frame-by-frame basis on the basis of the video signal of the first or second frame frequency, and collectively generated modulated light for each scanning line. 2. The image display method according to claim 1, further comprising: a second step of collectively scanning a predetermined image display surface in units of the frame. 4. In the first step, a plurality of light emitting elements, which are arranged one-dimensionally or two-dimensionally corresponding to each scanning line, are modulated and driven based on the video signal, so that each scanning line 4. The video display method according to claim 3, wherein the modulated light of is generated in a unit of the frame. 5. A plurality of the light emitting elements are arranged for each of the scanning lines, and the light beams emitted from the corresponding plurality of light emitting elements are multiplexed for each of the scanning lines to thereby combine the light beams. The image display method according to claim 4, wherein modulated light is generated. 6. The light beams emitted from the corresponding plurality of light emitting elements are adjusted and combined so that the ratio of the optical power of the respective light beams is proportional to a geometric progression of 2. The video display method according to claim 5, wherein: 7. The light beams emitted from the corresponding plurality of light emitting elements for each scanning line are reflected by half mirrors in the same propagation direction on the same optical axis, and the respective light beams are emitted. The image display method according to claim 5, wherein the beams are sequentially multiplexed. 8. Each of the half mirrors has a transmittance of about 50.
The image display method according to claim 7, wherein the image display method is [%]. 9. An optical amplification step, which is provided between the first and second steps, and which optically amplifies the modulated light for each scanning line, which is collectively generated in the first step. The image display method according to claim 3. 10. An image at a first frame frequency that is approximately equal to the ratio of the minimum resolved viewing angle of the human eye and the maximum angular velocity of the eye movement, or a second frame frequency that is higher than the first frame frequency. An image display device characterized by displaying. 11. The first frame frequency is approximately 3.6.
The image display device according to claim 10, wherein the image display device has a frequency of [kHz]. 12. Modulated light generation means for collectively generating modulated light for each scanning line on a frame-by-frame basis based on the video signal of the first or second frame frequency, and the modulated light for each scanning line generated collectively. 11. The image display device according to claim 10, further comprising: a scanning unit that collectively scans a predetermined image display surface on a frame-by-frame basis. 13. The modulated light generating means comprises a plurality of light emitting elements arranged one-dimensionally or two-dimensionally corresponding to each scanning line, and modulates and drives each of the light emitting elements based on the video signal. 13. The video display device according to claim 12, wherein the modulated light for each scanning line is collectively generated for each frame. 14. The image display device according to claim 13, wherein the plurality of light emitting elements are integrated. 15. The modulated light generating means has a plurality of the light emitting elements arranged for each scanning line, and emits each light beam emitted from the corresponding plurality of light emitting elements for each scanning line. 14. The video display device according to claim 13, further comprising a multiplexing unit that generates the modulated light by multiplexing. 16. The combining means adjusts the respective light beams emitted from the corresponding plurality of light emitting elements so that the ratio of the optical power of the respective light beams is proportional to a geometric progression of 2. 16. The video display device according to claim 15, wherein the video display device and the light are multiplexed. 17. The combining means is arranged corresponding to each of the plurality of light emitting elements for each scanning line, and propagates the light beams emitted from the corresponding light emitting elements on the same optical axis. 16. The image display device according to claim 15, further comprising a plurality of half mirrors that sequentially combine the respective light beams so as to be reflected in a direction. 18. Each of the half mirrors has a transmittance of about 50.
The image display device according to claim 17, wherein the image display device is [%]. 19. The image display device according to claim 17, wherein the plurality of half mirrors are integrated. 20. The light combining means comprises a light absorber for absorbing the respective light beams transmitted through the respective half mirrors.
7. The video display device according to 7. 21. The image display device according to claim 20, wherein each of the half mirrors and the light absorber are integrated. 22. The scanning means comprises an optically flat reflecting mirror, and driving means for vibrating or rotating the reflecting mirror in synchronization with the video signal.
The video display device described in. 23. The image display device according to claim 22, wherein the reflecting mirror is a rotary polygon mirror or a galvanometer mirror. 24. An optical amplifying means is provided between the modulated light generating means and the scanning means, and optically amplifies the modulated light for each scanning line collectively generated by the modulated light generating means. The image display device according to claim 12. 25. The modulated light, wherein the light amplifying means is doped with a light absorbing and emitting material that absorbs excitation light of a predetermined wavelength and emits light of the same wavelength as the modulated light when the modulated light enters. 25. The image display device according to claim 24, comprising an optical amplification medium made of an optical material transparent to the excitation light, and an excitation light source for emitting the excitation light in the optical amplification medium. 26. The optical amplifying medium has a plurality of waveguides provided corresponding to the modulated lights emitted from the modulated light generating means, respectively, and guides the modulated lights respectively. The waveguide guides light to the exit end face of the optical amplification medium while maintaining the mutual positional relationship of the modulated lights at the incidence end face of the optical amplification medium without being coupled with the other modulated light. The image display device according to claim 25. 27. Each of the waveguides has a fiber shape, and the incident end face and the output end face of the optical amplification medium are formed by binding the end portions of the waveguides. 26. The video display device according to 26. 28. The optical amplifying medium is formed by integrating the respective waveguides.
6. The video display device according to item 6. 29. An image display light source device used in a beam scanning type image display device, wherein a first frame frequency approximately equal to a ratio between a minimum resolved viewing angle of a human eye and a maximum angular velocity of eyeball following movement, Alternatively, a modulated light generation unit that collectively generates modulated light for each scanning line on a frame-by-frame basis based on a video signal having a second frame frequency higher than the first frame frequency, and the collectively generated modulation for each scanning line. A light source device for video display, comprising: a scanning means for collectively scanning light on a predetermined video display surface in the frame unit. 30. The first frame frequency is approximately 3.6.
30. The light source device for image display according to claim 29, which is made of [kHz]. 31. The modulated light generating means includes a plurality of light emitting elements arranged one-dimensionally or two-dimensionally corresponding to each scanning line, and modulates and drives each light emitting element based on the video signal. 30. The light source device for image display according to claim 29, wherein the modulated light for each scanning line is collectively generated in the frame unit. 32. The light source device for image display according to claim 31, wherein the plurality of light emitting elements are integrated. 33. The modulated light generating means includes a plurality of light emitting elements arranged for each scanning line, and emits each light beam emitted from the corresponding plurality of light emitting elements for each scanning line. 32. The light source device for image display according to claim 31, further comprising a combining means for generating the modulated light by combining. 34. The combining means adjusts the respective light beams emitted from the corresponding plurality of light emitting elements so that the ratio of the optical power of the respective light beams is proportional to a geometric progression of 2. 34. The light source device for image display according to claim 33, wherein the light sources are combined and multiplexed. 35. The combining means is arranged so as to correspond to the plurality of light emitting elements for each scanning line, and the light beams emitted from the corresponding light emitting elements are co-propagated on the same optical axis. 34. The light source device for image display according to claim 33, comprising a plurality of half mirrors for sequentially multiplexing the respective light beams so as to be reflected in a direction. 36. Each half mirror has a transmittance of approximately 50.
The image display light source device according to claim 35, wherein the light source device is [%]. 37. The light source device for image display according to claim 35, wherein the plurality of half mirrors are integrated. 38. The combining means comprises a light absorber for absorbing each of the light beams transmitted through each of the half mirrors.
5. The image display light source device according to item 5. 39. The image display light source device according to claim 38, wherein each of the half mirrors and the light absorber are integrated. 40. The scanning means comprises an optically flat reflecting mirror, and driving means for vibrating or rotating the reflecting mirror in synchronization with the video signal.
The light source device for image display according to. 41. The light source device for image display according to claim 40, wherein the reflecting mirror is a rotary polygon mirror or a galvanometer mirror. 42. An optical amplifying means is provided between the modulated light generating means and the scanning means, and optically amplifies the modulated light for each scanning line collectively generated by the modulated light generating means. The light source device for image display according to claim 29. 43. The modulated light, wherein the light amplifying means is doped with a light absorption / emission material that absorbs excitation light of a predetermined wavelength and emits light of the same wavelength as the modulated light upon incidence of the modulated light. 43. The light source device for image display according to claim 42, comprising an optical amplification medium made of an optical material transparent to excitation light, and an excitation light source for emitting the excitation light in the optical amplification medium. . 44. The optical amplification medium has a plurality of waveguides respectively provided corresponding to the modulated lights emitted from the modulated light generating means, and guides the modulated lights respectively. The waveguide guides light to the exit end face of the optical amplification medium while maintaining the mutual positional relationship of the modulated lights at the incidence end face of the optical amplification medium without being coupled with the other modulated light. The light source device for image display according to claim 43. 45. The waveguide is fiber-shaped, and the incident end face and the output end face of the optical amplification medium are formed by binding the end portions of the waveguides. 44. The image display light source device according to item 44. 46. The optical amplifying medium is formed by integrating the respective waveguides.
4. The image display light source device according to item 4.