KR100194497B1 - Direct view type image display device - Google Patents

Abstract

TECHNICAL FIELD This invention relates to the direct-view type image display apparatus which displays an image on an eye retina using a laser beam.

According to the direct-view image display device of the present invention, the laser light is modulated and scanned by an image signal, and the laser light is directly formed on the retina of the eye through an optical system, thereby preventing the occurrence of speckle noise and reducing power consumption. Good image can be seen.

Description

Direct view type image display device

1 is a block diagram showing the configuration of one embodiment of a direct-view image display device of the present invention.

2 is an explanatory diagram similarly showing a detailed configuration of each state.

3 and 4 are explanatory diagrams showing an optical path in the eyeball.

5 is a perspective view showing a configuration of another embodiment of the direct-view image display device of the present invention.

* Explanation of symbols for main parts of the drawings

1: light source 2: video signal supply means

3: modulation means (optical modulation system) 4: scanning signal supply means

5: scanning means (scanning system 6: projection optical system

7: eyes

This invention relates to a direct view type image display apparatus which uses laser light to display an image on the eye retina.

Background Art [0002] Conventionally, an image display device using laser light has a projection type image display device that optically modulates a laser light emitted from a light source or a light source into an image signal and performs horizontal scanning and vertical scanning by a scanning system to project on a screen. The characteristic of this apparatus is that an image of high brightness, high resolution, and high color purity is obtained.

However, in the above image display apparatus, since the surface of the screen is a rough surface, there is a problem that the so-called speckle noise that causes the grown-up laser light is diffused to occur.

This invention was made | formed in view of the said point, and there existed a problem that speckle noise generate | occur | produces by a laser beam.

This invention is made | formed in view of the said point, and an object of this invention is to provide the direct view type image display apparatus which can see a favorable image quality with little light quantity and power consumption, without speckle noise generate | occur | producing by laser light.

The direct view type image display device of the present invention includes a light source for emitting laser light, modulation means for light modulating the laser light emitted from the light source with an image signal, and horizontal scan and vertical scan for the modulated laser light, respectively, by a scan signal. And an optical system for imaging the scanning means and the scanned laser light on the retina of the eye.

In the direct-view image display device of the above-described configuration, the light intensity is modulated by the modulation means, and the beam light horizontally and vertically scanned by the scanning means is directly imaged on the retina of the eye by the optical system, and can be directly recognized as an image. .

Since this image is formed by laser light, high color purity and high resolution can be obtained. In addition, since all light is directed to the eye, high luminance is obtained with a small amount of light. In addition, the generation of speckle noise seen in a projection type image display device using laser light can be prevented.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of the direct view type image display apparatus which concerns on this invention is described with reference to drawings.

Article 1 is a block diagram showing the structure of this embodiment, and FIG. 2 is an explanatory diagram showing the specific structure of each part similarly.

In the image display device according to this embodiment, as shown in FIG. An optical modulation system 3 as modulation means for intensity-modulating the emitted laser light, and a scanning system as scanning means for horizontal scanning and vertical scanning of the modulated laser light by the scanning signal supplied from the scanning signal supply means 4 ( 5) and the projection optical system 6 which forms the scanned laser light directly on the retina of the eye 7. In the case of using a semiconductor laser as the light source 1, the light modulation system 3 can be finished integrally with the light source 1.

Next, with reference to FIG. 2, the specific structure of each part and its operation | movement are demonstrated. In the embodiment of FIG. 2, a He-Ne laser 11 is used as the light source 1. The laser light emitted from the He-Ne laser 11 is incident on the acoustooptic modulator (AOM) 13 which is converged by the block lens 12 and used as the light modulation system 3.

In the AOM 13, the incident laser light is intensity-modulated by the modal signal input from the video signal supply means circuit 14 as the video signal supply means 2. The modulated laser light becomes parallel light by the convex lens 15 and passes through the filter (ND-F) 16 to the reflector 17, and the optical path is deflected at almost right angles. Here, the filter 16 is a black filter and has a function of attenuating the luminosity to a level which is not dangerous even when incident on the eye.

The laser light reflected by the reflector 17 is of an elliptic shape suitable for incidence by the cylindrical lenses 18, 19 and 20 into the acoustooptic deflector (AOD) 21 as a horizontal scanning system. Converted into a beam cross-sectional shape. The laser light incident on the AOD 21 is an ellipse shape suitable for incidence by the cylindrical lenses 18, 19, and 20 into the acoustooptic deflector (AOD) 21 as a horizontal scanning system. Is converted into a beam cross-sectional shape. The laser light incident on the AOD 21 is of an elliptical shape suitable for incidence by the cylindrical lenses 18, 19, and 20 into the acoustooptic deflector (AOD) 21 as a horizontal scanning system. Converted into a beam cross-sectional shape. The laser light incident on the AOD 21 is horizontally scanned in accordance with the horizontal scanning signal input from the horizontal scanning signal supply circuit 22 serving as the scanning signal means 4.

The horizontally scanned laser light is returned to the circular beam shape by the cylindrical lenses 23 and 24, and the polarized plane in the vertical direction is circled by the λ / 4 polarizer 25 inserted therebetween. Converted to polarized light. The circular beam shaped laser light converted into circularly polarized light enters the galvanometric mirror (GM) 26 as a vertical scanning system. The GM 26 is driven by the vertical scan signal input from the vertical scan signal supply circuit 27 as the scan signal supply means 4, and the laser light performs vertical scan.

The laser light modulated and scanned as described above corresponds to the eye 28 (the eye 7 of FIG. 1) through the lenses 29 and 30 constituting the optical system 6 for projection to the eye 28. Incident directly). That is, the laser light once converged on the surface 31 by the lens 29 is converted into a parallel beam by the lens 30, and then enters the eye 28, and the lens 32 of the eye 28 is incident. Is formed on the retina (33).

As shown in FIG. 3, the eye 28 forms light rays emitted from one point of the outer space on the retina 33 by the lens 32, and stimulates the visual cells 34 in the retina 33 to burn. Perceive it as a meeting of shops. In this embodiment, as shown in FIG. 4, the image is scanned by scanning the retina 33 with laser light.

In this embodiment, the amount of light entering the eye 28 is 1 nw to 2 nw, and a resolution of 300 to 350 TVs can be obtained.

In addition, the spot diameter of the laser light in the pupil portion was about 2.2 mm. When the spot diameter becomes 1 mm or less, the image is not visible due to the movement of the pupil 50 or the iris 51, so the diameter is 1 mm or more. It is preferable. In addition, the horizontal viewing angle was 8.8 degrees. This viewing angle is equivalent to viewing 1.9-inch TVs 25cm away. The larger the viewing angle is to look at the large screen, which is preferable.

According to this embodiment, since no screen is used, speckle noise seen in the projection image display device can be eliminated. In addition, since all the laser light is turned to the eye, the required amount of light is at least reduced, and the power consumed by the He-Ne laser 11 emitting the laser light can be reduced. Moreover, an image can be seen only by an observer, and has an invisible characteristic in the surroundings.

5 is a perspective view showing the configuration when the present invention is applied to a color image device. In FIG. 5, the same code | symbol is attached | subjected to the part corresponding to the Example shown in FIG. 2, The description is abbreviate | omitted for convenience.

In this embodiment, as the light source, lasers 11R, 11G, and 11B which emit three colors of laser light of red, green, and blue, respectively, are installed, and AOM (13R, 13G, 13B) lenses 15R, 15G, and 15B are provided in the respective optical paths. ) And dichroic mirrors (41R, 41G 41B) were installed. The laser light emitted from each laser 11 is light-modulated by each color signal of red, green, and blue in each AOM 13 in each optical path. The modulated laser light is finished with one light beam 42 by a dichroic mirror 41 reflecting light of each color and transmitting light of a different color, and then rotating a multifaceted mirror 43 as a horizontal scanning system. Is horizontally scanned by

The horizontally scanned laser light is converted into parallel light 45 by the lens 4, and is again focused by the lens 46 on the GM 26 as a vertical scanning system and scanned vertically.

The laser light 47 of three colors thus modulated-scanned is incident on the eye 28 after passing through the lens 28 and the lens 30 as the optical system for projection of the eye 28.

According to this embodiment, the color image can be displayed by using the lasers 11R, 11G, and 11B of the plurality of wavelengths. The plural wavelengths are not limited to three but may be four or more, thereby increasing the reproduction range of colors.

As described above, the direct view type image display device of the present invention modulates and scans the laser light by an image signal, and forms the laser light directly on the retina of the eye through an optical system, thereby preventing the occurrence of speckle noise. Good images can be seen with low power consumption.

Claims (1)

A light source for emitting laser light, and means for optically modulating the laser light emitted from the light source or the light window by an image signal; And scanning means for horizontally scanning and vertically scanning the modulated laser light by scanning signals, and an optical system for imaging the scanned laser light on an eye retina.