JP2011090261A - Scanning type display device optical system or non-scanning one-dimensional display device optical system and display device using these optical systems - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scanning type optical system which has two spectroscopic elements simultaneously, to perform minute separation of wavelength of white light, such as several nano meters or less, and uses a spatial modulation element such as a CMOS which can singly control color separating adjustment, to control all the wavelength distributions to reproduce spectral distribution. <P>SOLUTION: In the scanning type display device optical system, light from a lamp 1 is dispersed and synthesized by at least two transmission type diffraction elements 7 and 11, and is spatially modulated by an LCOS (Liquid Crystal on Silicon) 9 arranged while dispersing and synthesizing the light, and then the spatially modulated and synthesized light is projected as an image onto a screen S by a one-dimensional scanner mirror 14, and whereby a two-dimensional image in which each line image element has optional wavelength distribution is projected. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the present invention, each line segment image element in an image is arbitrarily determined using at least two spectroscopic elements such as a reflection type diffraction element and a transmission type diffraction element, and a high-speed spatial modulation element represented by LCOS (Liquid Crystal on Silicon). A line scanning display optical system and a line scanning display device that form an image having a spectral distribution by scanning, or a display optical system that does not have line scanning (non-scanning one-dimensional display device optical system) and those optical systems Related to the display device.

  Conventionally, a light source that emits white light, a continuous spectrum light forming unit that converts the white light emitted by the light source into spectral light continuously distributed in space, and each pixel of a color image to be displayed Projection-type display including a light valve that drives each pixel element arranged secondarily to time-division-modulate incident light, and a spectral light scanning unit that cyclically scans continuous spectral light in one direction on the light valve. An apparatus (e.g., US Pat. No. 6,057,049), at least one light source configured to provide spectrally and spatially resolved light, and receiving and modulating the spectrally and spatially resolved light; A spatial light modulator configured to selectively send a spatial color selected from to form a set of partial images, and to receive the set of partial images and to Scanning display device optical system and scanning display device comprising a display system including at least one scanning device configured to scan a set of partial images to create a full frame color image (for example, Patent Document 2) ) Etc. are known.

Japanese Patent Laying-Open No. 2004-240293 (refer to claims 1 and 1) Japanese Patent Laying-Open No. 2005-326837 (see claims 1 and 1 and 2)

Incidentally, a two-dimensional image display device in which the spectral distribution of each pixel is arbitrarily determined is realized by using two spectral elements, a spatial modulation element, and a scanning system.
However, in this display device, since the rewriting speed of the spatial modulation element, that is, the modulation frequency must be very high, the cost is high, and the use of DMD has complicated the optical system.

  Further, in conventional display devices, scanning display device optical systems, and scanning display devices, color display based on conditional color (R, G, B) is fundamental. There was a problem that the color perceived by the person who made it came out. In other words, the image of the target object captured by the camera has the same color on the display device as the original color for an observer who has the same color matching function as the standard color matching function. However, the same color was not seen by observers with different color matching functions.

  This is more conspicuous for an observer with color blindness, which may be a serious problem in a display device using three LED light sources. Further, in the synthesis of the limited three primary colors of R, G, and B, a color at a single wavelength and a color in the vicinity thereof cannot be displayed, and color reproduction is performed in a region where the original chromaticity coordinates are limited.

  Moreover, in the color vision inspection related to driving, the display of the traffic light using the LED could not make an image reproducing the spectral distribution of the LED with the conventional display device. It could not be done with a display device.

  Therefore, in the present invention, all of the spectral elements using two spatial light modulators such as LCOS that have two spectroscopic elements at the same time, finely decompose the wavelength of white light to a few nanometers or less, and independently control the color coding adjustment, It is an object of the present invention to provide a scanning optical system or a non-scanning one-dimensional display device optical system capable of reproducing the spectral distribution by controlling the wavelength distribution, and a display device using these optical systems.

  For example, at least two optical elements (spectral elements) such as a reflective diffractive element and a transmissive diffractive element are used at the same time, and the three primary colors of white light (R (red light), G (green light), and B (blue light)) are used. Performs separation and synthesis of light of many types of wavelengths that are not limited, and performs the desired spectral adjustment control with a high-speed spatial modulator such as LCOS placed between at least two optical elements (spectral elements) to create a subtle spectral distribution A two-dimensional image in which a lattice pattern with each line having an arbitrary spectral distribution in one direction in the image, which was difficult to realize with a conventional projection apparatus (spectral distribution using a conventional programmable light source) (However, the programmable light source only displays one type of spectral distribution.), Fully reproduces the natural spectral distribution, or reproduces the unique spectral distribution such as an LED. And to provide a display device which bets can. Another object of the present invention is to provide a display device that can be used for inspection of color contrast, luminance contrast, and the like.

  In order to solve the above-mentioned problem, the invention of claim 1 divides the light from the white light source into a slit shape, performs decomposition for each wavelength by the first spectroscopic element, and transmits the transmitted intensity for each wavelength decomposed by the spatial modulation element. Is adjusted by a temporal method or a change in transmittance, and is synthesized for each wavelength by the second spectroscopic element so that each pixel has an arbitrary wavelength distribution (corresponding to the original white slit). A one-dimensional image) is formed, and the scanning projection system scans and projects the one-dimensional image having the arbitrary wavelength distribution in the vertical direction or the horizontal direction. An optical system of a scanning display device, which displays a two-dimensional image having

  That is, according to the first aspect of the present invention, the light from the white light source is dispersed and synthesized by at least two spectral elements, the intensity is modulated by the spatial modulation element disposed between the spectral and the synthesized, and the intensity is modulated and synthesized. The scanning display device optical system is characterized in that the projected light is projected onto a screen by a scanning means and each line drawing element projects a two-dimensional image having an arbitrary wavelength distribution.

  According to the second aspect of the present invention, light from a white light source is split and combined by at least two spectroscopic elements, intensity-modulated by a spatial modulation element disposed between the spectroscopic and synthesizing, and spatially modulated and combined. Is a non-scanning one-dimensional display device optical system that projects an image on a screen by a cylinder lens and projects a two-dimensional image in which each line drawing element has an arbitrary wavelength distribution.

  A third aspect of the present invention is a display device having the display device optical system according to the first or second aspect.

  According to the present invention, at least two spectroscopic elements such as a reflective diffractive element and a transmissive diffractive element are used at the same time for the three primary colors of white light (R (red light), G (green light), B (blue light)). Separation and synthesis using light of an unlimited wavelength, desired spectral transmittance control can be performed with a high-speed spatial modulation element such as LCOS, and it is possible to present vertical or horizontal lines having an arbitrary spectral distribution, In the experiment for the psychophysical experiment about the color vision, it exerts the big effect which was not thought until now.

FIG. 1 is an optical diagram of a first embodiment of an optical system of a scanning display device according to the present invention. FIG. 2 is an explanatory diagram showing an example of a line image drawn on the screen. FIG. 3 is an explanatory diagram showing another example of a line image drawn on the screen.

Example 1
FIG. 1 is an optical diagram showing a first embodiment of an optical system of a scanning display device according to the present invention.

  The scanning display device optical system includes a white light source lamp 1, an elliptical reflector 1 a, a light pipe 2, a relay lens 3, a slit member 4, a relay lens 5, a transmission type diffractive element (first spectroscopic element) 7, and a condensing element. Lens 8, LCOS 9 which is a transmission type spatial modulation element, collimating lens 10, transmission type diffraction grating (second spectral element) 9, condenser lens 10, spatial modulation element (transmission type diffraction element) 11, relay lens 12, relay lens 13, a one-dimensional scanner mirror 14, an encoder device (the encoder device is not shown), and a screen S.

  The light synthesized by the scanning display device optical system becomes a one-dimensional image (sometimes fan-shaped) 15 ′ having a spectral distribution for each pixel, and this one-dimensional image is applied to the screen S by the scanning optical system. A two-dimensional image that is scanned and projected and each line drawing element has an arbitrary wavelength distribution is displayed on the screen S.

In addition, when the LCOS 9 that is a transmissive spatial modulation element is sufficiently fast, a two-dimensional image in which each pixel has an arbitrary spectral distribution can be displayed. Further, when the speed of the LCOS 9 which is a transmission type spatial modulation element is medium, display of an image (visual stimulus) in which the spectral distribution changes slowly in the scanning direction (low spatial frequency) and the vertical and horizontal spatial resolutions are different. (Presentation) is possible.
At least a finally obtained two-dimensional image having a spectral distribution only in the dimensional direction can be rewritten at 30 to 300 frames per second. As a result, a motor vision experiment is also possible as a visual psychophysical experiment.

This point will be described with reference to FIGS.
As shown in FIG. 2, the scanning display device optical system shows a two-dimensional image in which each line drawing element has an arbitrary spectral distribution. For example, it is assumed that there are 640 scanning lines SL in the horizontal direction of the paper (FIG. 2). FIG. 2 shows a case where the one-dimensional scanner mirror 14 scans in the vertical direction of the paper surface (FIG. 2), and each scanning region has a different spectral distribution (in this example, it has 640 types of spectral distributions).

  In this case, after scanning a certain area, when scanning the adjacent area, weighting the spectral distribution for scanning the original area and superimposing the spectrum, the adjacent area is scanned. It will have different spectral distributions in the area, and it can display a two-dimensional image with a grid pattern with each line having an arbitrary spectral distribution in one direction in the image, and complete the natural spectral distribution Or a unique spectral distribution such as an LED can be reproduced.

  Further, as shown in FIG. 3, the scanning display device optical system has 640 scanning lines SL, and can change the vertical spectral distribution by rewriting LCOS 9 which is a spatial modulation element. This is not possible with a cylinder lens system that does not scan. For example, if the frame rate (image rewriting speed) of a spatial modulation element such as LCOS 9 is 300 FPS and the final image is 30 FPS, rewriting can be performed 10 times in the vertical direction.

  This means that each pixel of one vertical line drawing can have a different spectral distribution. In other words, after forming one pixel of one vertical line drawing, when forming adjacent pixels, different spectra can be superimposed to form different spectral distributions. Can be changed.

  This makes it possible to display a two-dimensional image in which a grid pattern in which any pixel in one line drawing in the image has an arbitrary spectral distribution is generated, to completely reproduce the natural spectral distribution, Spectral distribution can be reproduced.

  As shown in FIG. 1, the scanning display device optical system has at least two diffractive elements 7 and 11 as transmission diffractive elements at the same time.

  Here, a xenon lamp may be used as the lamp 1, and the brightness is 300W to 500W. The light pipe 2 has a numerical aperture NA of 0.5, a long side of about 2.1 mm, a short side of 0.01 to 0.1 mm, and an optimum short side dimension of 0.03 to 0.3 mm. 05 mm. The relay lens 4 desirably has a magnification of about 5 times.

  The slit member 4 has a numerical aperture NA of 0.1, a length of about 10.0 mm to 11.0 mm, and an optimum length of 10.92 mm. Further, the size of the hole diameter of the slit member 4 is 0.1 to 0.5 mm, and the optimum size is about 0.2 mm.

  LCOS 9, which is a spatial modulation element, is 0.7 inch, vertical and horizontal (14 mm to 15 mm) × (10 mm to 11 mm), and an optimal example is 14.56 mm × 10.92 mm.

  In addition, it has a size of about 12.3 mm in the spectroscopic direction (400 nm to 700 nm). The transmissive diffraction grating 11 has about 1000 diffraction gratings per 1 mm.

The focal lengths f of the relay lenses 12 and 13 are about f = 16 mm and 25 mm, respectively.
The scanning angle of the one-dimensional scanner mirror 14 is (scan angle) ± 8 degrees, and the mirror size is 4 mm × 4 mm.
The frame rate (image rewriting speed) of LCOS 9 is typically 300 Frames per second (FPS).

The distance from the scanner mirror 14 to the screen S is about 750 mm, and the screen size is 20 inches.
The slit member 4 and the LCOS 9, which is a spatial modulation element, are conjugate when considered for each wavelength.

  With the above configuration, the light from the white light source is decomposed for each wavelength by the first spectral element, the spectral transmittance is adjusted by the LCOS according to the orientation of the liquid crystal molecules at each position, and the second spectral element is combined for each wavelength. To form a one-dimensional image having an arbitrary wavelength distribution in a portion corresponding to each pixel, and project this one-dimensional image on the screen S by a scanning scanning display device optical system having a scanner mirror 14. A two-dimensional image in which the line drawing element has an arbitrary spectral distribution is displayed.

  By scanning the one-dimensional scanner 14 without changing the LCOS 9 that is a spatial modulation element, the present invention can form, for example, a clear vertical stripe image close to natural color, It can also be applied to visual and color vision inspections at driver's license test centers, or photometers and luminance meters.

  The LCOS 9 is controlled by the arithmetic control unit 16 to synthesize a desired spectral distribution, and the light of each wavelength component that has been decomposed in detail by the transmissive diffraction element 7 is spatially modulated by the LCOS 9 that is a spatial modulation element and transmitted. Detailed synthesis of the spectral distribution is performed via the type diffraction element 11.

It is possible to present an image that has been modulated with any spectral distribution and brightness in a certain one-dimensional direction, which is necessary for psychophysical experiments and color vision tests.
In addition, since the color stimulus presented to the subject can be rewritten at the LCOS rewrite frequency, when the spectral distribution is only a one-dimensional change, the display itself is considerably faster (LCOS is 300 Hz). In this case, since it can be rewritten by 300 frames per second), it can also be used for a psychophysical experiment for measuring a motion threshold of a one-dimensional lattice.

  Note that the light source is not limited to a white light source, white light or a light source having a wide wavelength width corresponding to the light source, a composite light source in which a plurality of light sources are used to artificially widen the wavelength width, and a discrete wavelength range of a wide wavelength range. It is possible even with a light source.

  Also, a video information providing unit is added to the scanning display device optical system of FIG. 1, and a disc on which video data is recorded is placed in the video information providing unit and provided to the arithmetic control unit. Alternatively, video information transmitted through radio waves or optical cables can be provided to the arithmetic unit.

Control of the spatial modulator by the arithmetic control unit 14 for displaying an arbitrary spectral distribution of 256 pixels vertically and 320 pixels horizontally is as follows.
Assuming that the LCOS 9 has a rewriting speed of 640 × 480 pixels at 300 FPS, images having different spectral distributions of a maximum of 640 lines are obtained as line drawings.

  In addition, since a one-dimensional image having a spectral distribution in the middle can be rewritten up to 300 seconds, if the final image requires a rewriting speed of 30 FPS, it can be rewritten 10 times for each line. , A two-dimensional image of 640 × 10 pixels can be obtained.

  If the rewriting speed of LCOS9, a transmission type spatial modulation element, or a reflection type modulation element is increased, for example, if it is 3000 FPS, a spatial modulation element with the same number of pixels is assumed and a two-dimensional 640 × 100 pixel is assumed. An image is obtained.

  In addition, by using the scanner part as a cylinder lens and enlarging the slit in the direction parallel to the paper surface, the same effect as mechanical scanning can be obtained, and each line drawing element presents a two-dimensional image having an arbitrary wavelength distribution. It can also be a device.

DESCRIPTION OF SYMBOLS 1 ... Lamp 7 ... Transmission type diffraction element 9 ... LCOS
11 ... Transmissive diffraction element 14 ... 1D scanner

Claims (3)

  The light from the white light source is split and combined by at least two spectroscopic elements, the intensity is modulated by the spatial modulator arranged between the spectroscopic and synthesizing, and the intensity-modulated and synthesized light is projected onto the screen by the scanning means. A scanning display device optical system, wherein each line drawing element projects a two-dimensional image having an arbitrary wavelength distribution.   The light from the white light source is split and combined by at least two spectroscopic elements, the intensity is modulated by a spatial modulation element arranged between the spectroscopic and synthesizing, and the intensity-modulated and synthesized light is projected onto the screen by a lens. A non-scanning one-dimensional display device optical system, wherein each line drawing element projects a two-dimensional image having an arbitrary wavelength distribution.   A display device comprising the display device optical system according to claim 1.

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