JPH08160887A - Information display terminal - Google Patents

Abstract

PURPOSE: To miniaturize an information terminal using LEDs, so that it is mounted on a head by arranging a light emitting device, first and second reflection mirrors so that the light beams emitted from the device and the image forming beams reflected on the second reflection mirror are made crossed to each other. CONSTITUTION: A second reflection mirror 305 is provided so that it is horizontally placed for an eyepiece lens 303 through which image forming beams are visualized. A light emitting device 304 is provided between the lens 303 and the mirror 305 and is placed below the horizontal line with which the respective centers of the lens 303 is connected the mirror 305 so that the light beams emitted from the device 304 and the image forming beams reflected by the mirror 305 are made crossed to each other. Moreover, a first reflection mirror 308 is provided between the lens 303 and the mirror 305 and is placed above the horizontal line connecting the respective centers of the lens 303 and the mirror 305. Thus, the information display terminals is miniaturized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable display for displaying image information using a light emitting element.

[0002]

2. Description of the Related Art As a background for developing this information display terminal, there is a new information delivery system. The new information distribution system is a system for distributing image information on a newspaper produced by a newspaper company (center station) to homes throughout the country using satellite lines. The most important feature of this information distribution system is that it realizes so-called paperlessness by using "paper", which is a conventional recording medium for newspaper information, etc., as electrical data from the time of delivery, and also satellite communication. The advantage is that it can deliver fresh newspaper information nationwide by taking advantage of the simultaneity and multi-destination.

However, the newspaper information handled by this information distribution system is composed of "character" information such as headlines, text articles, advertisement articles, etc. and "picture" information such as photographs and diagrams, as the newspaper information. If you try to express with a dot image, the number of dots will become enormous. Therefore, a display terminal that reproduces newspaper information is required to have high resolution display. For example, an information display terminal includes a cold cathode ray tube (CRT), a liquid crystal display (LCD), and the like. When an attempt is made to display newspaper information on a CRT or liquid crystal display,
With the current technology, the device becomes large.

Therefore, recently, a method using an LED as described in Japanese Patent Application Laid-Open No. 2-42476 has been receiving attention. In these systems, linearly arranged LEDs emit arbitrary information as line information, and the line information is sequentially deflected by a rotary mirror or a vibrating mirror to reproduce paper surface information. However, the present invention does not suggest the case of visually recognizing one LED array arranged in a straight line with both eyes, and proposes to provide one LED array corresponding to the left and right eyes.
Further, Japanese Patent Application Laid-Open No. 4-307590 discloses a case where the above method is visually recognized with both eyes. Specifically, the light emitting element array is arranged vertically with respect to the observer's face, and the light emitted from the light emitting element array is sequentially reflected in the left and right directions by the rotating mirror, and the output light deflected by the rotating mirror is output. One fixed mirror is provided on each of the left and right eyes to further deflect the left and right eyes of the observer. It also describes a technique for displaying an image corresponding to the left and right eyes by time-divisionally deflecting the output of the information display terminal with respect to the rotating mirror.

[0005]

However, in the above-mentioned conventional technique for visually recognizing LEDs with both eyes, it is necessary to arrange the LED array, the magnifying lens and the rotating mirror on the same straight line, and the information display terminal is an observer. On the other hand, the structure will be projected to the front. Further, the LED array also needs to be vertically arranged with respect to the face of the observer. Further, in the above-mentioned conventional technique, since the time division is performed by the rotating mirror, it takes twice as long as usual to project an image corresponding to the left and right eyes, and the projected image generally causes flickering.

Even from such a point, the L
The information display terminal using the ED does not consider the miniaturization thereof, and if the resolution is required to some extent, the size of the existing display element is limited, so that the device becomes large, or I had to take a complicated structure.

In order to solve the above problems, the present invention provides an LED
It is an object of the present invention to provide a miniaturized structure that can be worn on the head of an information display terminal using.

[0008]

In order to achieve the above object, the present invention provides a light emitting device comprising a plurality of light emitting elements, and a first reflecting mirror for reflecting light emitted from the light emitting device. A second reflecting mirror that forms an image of the light from the light emitting device by reflecting the light reflected by the first reflecting mirror in a predetermined operation, and the light emitted from the light emitting device and the second reflecting mirror. The light emitting device, the first reflecting mirror, and the second reflecting mirror are arranged so that the imaged light reflected by the reflecting mirror intersects.

[0009]

That is, according to the present invention, the second reflecting mirror is provided horizontally with respect to the eyepiece lens for visually recognizing the imaged light, and the light emitted from the light emitting device is reflected by the second reflecting mirror. The light emitting device is provided below the horizontal line connecting the centers of the eyepiece lens and the second reflecting mirror and between the eyepiece lens and the second reflecting mirror so that the imaged light intersects. By providing the first reflecting mirror above the horizontal line connecting the centers of the eyepiece lens and the second reflecting mirror and between the eyepiece lens and the second reflecting mirror. , The information display terminal was downsized.
However, such an LED array, a rotary reflecting mirror, and a fixed reflecting mirror are arranged so as to secure the optical path length required to reproduce an image.

[0010]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. The goggle type referred to in the present invention means that the image image (newspaper information) displayed is visually recognized with both eyes.

FIG. 1 shows one form of an information distribution system using a goggle type display. The new information delivery system in FIG. 1 is a center station 1 that is a delivery source of newspaper information and has a function of accessing a communication satellite, and the center station 1
A communication satellite 2 having a function of delivering information transmitted from all over the country, a remote station 9 having a function of reproducing newspaper information and a destination of newspaper information, and information recorded on the recording medium 5. And a goggle type display 8 of the present invention having a function of virtually reproducing. The remote station 9 specifically comprises a receiver 3 for receiving newspaper information from the communication satellite 2 and a recording device 4 for recording the received newspaper information on a recording medium such as an optical disk or a memory. In such an information distribution system, a recording device provided at homes (remote stations 9) throughout the country for image information of newspapers delivered from a newspaper company (center station 1) using a satellite line. By using the goggle type display 8 as a reproducing device of the recording medium 5 by recording the information on the recording medium 5 in accordance with No. 4, it is possible to reproduce the newspaper information at a necessary time at any place.

The details of the goggle type display 8 of the present invention are shown in FIG. The goggle type display 8 has a terminal section 11 for reading newspaper information recorded on the recording medium 5.
And a goggle section 12 for reproducing the read newspaper information by a light emitting element such as an LED. In order to reproduce, for example, an A2 size newspaper page (one page of the newspaper page), the terminal section 12 reads out the information of one line unit of the A2 size newspaper page and reads the goggles section 11
Send to. At that time, the terminal unit 12 needs to transmit the read information in units of one line within a limited time, so that the serial data is converted into parallel data and then transmitted to the goggle unit 11. On the other hand, the goggle unit 11 reproduces a newspaper page by controlling blinking of a plurality of light emitting elements based on the transmitted data.

1. Goggles Section FIG. 3 shows the structure of the goggles section 12 shown in FIG. FIG.
In the goggles section 12, the housing 301 and the cover 30 are provided.
2, an eyepiece part 303 for an observer to visually recognize an image (newspaper information), a light emitting device 304 that emits light based on the newspaper information that is input in parallel, and reflects the light emitted by the light emitting device 304. And a fixed type reflection mirror 308 for reflecting the light reflected by the fixed type reflection mirror 308.
03, a rotary reflecting mirror 305 for deflecting the rotary reflecting mirror 305, a driving device 306 for rotating the rotary reflecting mirror 305, and a screen cueing sensor 307 for synchronizing newspaper information to be displayed. Further, the screen cueing sensor 307
Is composed of a shielding plate 307a and a photo interrupter 307b. In addition, in this embodiment, the fixed reflecting mirror 30 is used.
Although 8 is treated as a plane mirror, it is possible to optically change the optical path length by using it as a convex mirror or a concave mirror, and it can also be used for adjusting the angle of view. Further, although the rotary type reflecting mirror is adopted in the present embodiment, a vibrating type reflecting mirror may be used. Further, the fixed reflecting mirror and the rotating reflecting mirror may be arranged in reverse.

The processing operation in the goggle unit 12 is as follows. First, the light emitting device 304 turns on the LED provided in the light emitting device 304 according to the paper surface data (each horizontal line) sequentially sent from the terminal unit 11. Light emitting device 3
The light emitted from 04 is guided to the rotary reflecting mirror 305 via the fixed reflecting mirror 308. In the goggle unit 12, the rotary reflecting mirror 305 is rotated to obtain a two-dimensional image in order to obtain a high-definition image. That is, the rotary reflector 30
A two-dimensional image is obtained by turning on the LED of the light emitting device 304 during the rotation so that light enters the eyepiece lens 303 during the rotation of 5. In this case, in order to utilize the afterimage effect of the human eye, it is necessary to consider the image synchronization in which the same image as the scanning cycle is generated for a certain period of time so as to overlap the prints.

The direction of rotation must be clockwise in FIG. 6, which will be described later, in order for an observer to view the screen from top to bottom.

The scanning cycle is between 30 Hz and 15 Hz. Since the rotary reflecting mirror 305 is a double-sided mirror, the rotation speed of the reflecting mirror is set to 15 Hz to 7.5 Hz (900 to 450 rotations / minute), which is half the scanning speed. Rotating mirror 3
05 is a period of turning from ψ1 to ψ2 out of a half turn (turning 180 degrees).

A motor 306 is used as a rotation driving mechanism. This reduces the rotation speed of the motor 306 with gears and slightly adjusts the current. There is also a method of using a double-sided mirror to display half of the information on one screen on one surface and the other half on the other surface. This half of the information may be in the upper half of the screen or the lower half of the screen, but may be in every other line as in the case of a television interface.

Regarding image synchronization, in order to determine the timing of the starting point of image scanning, a pulse is generated by the screen cueing sensor 307 from the rotation of the rotary reflecting mirror 305. Specifically, it is a pulse generated when the shield plate 307a directly connected to the axis crosses the photo interrupter 307b to block light. The screen synchronization will be described in more detail in the description of the terminal section.

Attention should be paid to the goggles section 12 as follows.
The point is that the newspaper surface is reproduced by the above-described processing operation in a miniaturized structure having a length of 90 mm, a width of 160 mm, and a depth of 40 mm. Therefore, in the goggle unit 12, the light emitting device 304, the fixed reflecting mirror 308, and the rotating reflecting mirror 3 are provided.
05 as one system, and they meet predetermined conditions (light emitting device,
It was arranged so as to satisfy the optical system arrangement). In addition, here, one system includes a light emitting device 304, a fixed reflecting mirror 308,
One rotating reflecting mirror 305 and one rotating reflecting mirror 305 are provided, and the light emitting device 3
It means that the light from 04 is visible with both eyes.

As an example, a predetermined condition for reproducing an A2 size newspaper page in the goggles will be described.

1.1 Light Emitting Device FIG. 4 is a diagram showing the light emitting device 304 in detail. The light emitting device 304 in FIG. 4 is composed of an LED, which is a light emitting element, and a plurality of connectors capable of receiving newspaper information transmitted from the terminal unit 12 in parallel. Specifically, in the light emitting device 304, 1792 LED arrays (the length of the issuing portion is 114 mm) are linearly arranged. Like this
By arranging 1792 ED arrays, the light emitting device 30
As for 4, the resolution of A6 size newspaper page data is 40
0 dpi = 1792 dots (the number of LEDs) /4.48
Output is made in inches (one side of A6 size). The goggle type display 8 wants to reproduce an A2 size newspaper surface as a maximum paper surface at a resolution of 200 dpi, but in that case, by performing a process of thinning out A2 size newspaper surface data for each dot in the terminal unit 11. make it happen. Even if you reproduce an A4 size newspaper,
If this light emitting device is used, a resolution of 200 dpi can be secured, so there is no problem. If it is a display device with a resolution of 200 dpi or more, one character (about 3 mm
Corner) can be expressed by 24 dots or more, and the dot resolution can be satisfied so as not to damage the character information.

On the other hand, the length of the LED array is 114 mm by determining the number of light emitting elements based on the A6 size.
(1792 × 63.5 μm). The LED size of 63.5 μm can be considered to be the smallest in existing products. Light emitting device of this length (134mm including the outline)
If you use, you can install it in the range of average head width 150mm by referring to "Ergonomics Standard Numerical Formula Handbook" (supervised by Takahiko Sato), and it becomes possible to design an optimal goggle type display. .

That is, the goggle type display 8 is
In order to handle 2 size newspaper page data (3232 dots horizontally and 4736 dots vertically when the resolution is 200 dpi), A6 size page data is 400 dpi (long) considering the average human head width. 114 mm) L
By adopting an ED array, we have achieved optimal goggle display.

1.2 Optical System Arrangement 1.2.1 Optical path length (goggle type) Next, when the light from the above-described light emitting device 304 is viewed with both eyes, specifically, when a person reads a newspaper. Similarly, conditions for reproducing a newspaper page with a virtual image at a position 30 cm in front of the eyes will be described with reference to FIG.

In FIG. 5, the goggle section 12 has 17
A light emitting device 304 in which 92 LEDs are linearly arranged,
Two eyepiece lenses 303-A and B, which are magnifying lenses having a viewing angle of 45 degrees and a diameter of about 30 mm (effective diameter of 26 mm),
It is composed of prisms 501-A and B provided in each of the eyepiece lenses 303-A and B. Note that, in FIG. 5, the above-mentioned rotary reflecting mirror and fixed reflecting mirror are not shown. The distance between the centers of the eyepieces 303-A and B described above is an example for an adult male with reference to the eye width (pupil distance) shown in "Ergonomics Standard Numerical Equation Manual" (supervised by Takahiko Sato). Since the average is 63.2 mm and the standard deviation is 3.6 mm, 65 mm was adopted as the center value.

The optical path length from the light emitting device 304 (LED array) for making the light from the light emitting device 304 visible with both eyes to the eyepieces 303-A and 303-B will be described.

Since the viewing angles of the eyepieces 303-A and 303B are about 45 ° as described above, the light emitting device 304 must be arranged within the viewing angles of these eyepieces. The viewing angle θ through the eyepiece lens can be expressed by the equation (1).

[0028]

[Equation 1]

When the optical path length from the light emitting device 304 to the eyepieces 303-A and B is 126 mm excluding the eyepieces, the viewing angle θ through the eyepieces is 46.4 °. And the viewing angle of the eyepiece lens is 45 °. Further, if the position of the user's pupil is 5 mm away from the end of the eyepiece lens, the viewing angle θ ′ through the eyepiece lens at that time is 40.1 ° from the equation (2).

[0030]

[Equation 2]

In the present embodiment, the optical path length is 126 mm, but this is because the angle of view of the light emitting device (LED array) viewed from the end of the eyepiece is about 45 °, and the light emitting device (LED) is seen from the pupil through the eyepiece. It is a value when the view angle of the (array) is set to about 40 °.

Table 1 shows the relationship between the optical path length and the angle of view when the distance between the eyepieces is 65 mm.

[0033]

[Table 1]

As can be seen from Table 1, when the angle of view when the light emitting device (LED array) is viewed from the pupil through the eyepiece lens is about 40 °, the minimum value of the optical path length from the pupil is about 150.
mm. By subtracting the distance from the eyepiece to the pupil (including the thickness of the eyepiece of 19 mm) of 24 mm from this 150 mm, the optical path length from the end of the eyepiece to the light emitting device (LED array) becomes 126 mm. The angle of view in the optical path length satisfies about 45 °. From the above, the optical path length of this embodiment is determined.

However, although the optical path length changes depending on how much angle of view is set on the display device, it is desirable to set the angle of view to about 40 ° to 45 ° shown in this embodiment.

Further, the eyepieces 303-A, B are provided with prisms 501-A, B for correcting the congestion angle.
The congestion angle is the center P (1) of the eyepiece lens 303-A.
And the center O (1) of the display device 304 and the eyepiece lens 30.
It is an angle formed by the center Q (1) of 3-B. By adjusting this angle, it is possible to adjust the sense of distance of the image image reproduced in the goggle unit 12. That is, the focus of each eye can be corrected to a distance from the actual position by passing through the individual eyepiece lenses 303-A and 303-B, but even in that case, when one object is shown with both eyes. The actual optical path length of 126 mm is recognized by the observer. For this reason, the human eye grasps an object with an actual optical path length of 126 mm, even though the eyepiece corrects the focus far, which is unnatural. To eliminate this unnaturalness, it is necessary to correct the above-mentioned congestion angle. As shown in FIG. 5, the congestion angle in this embodiment is 65 m across the eye.
If m and the optical path length are 126 mm, then θ ₃ = 1 from the equation (3).
It becomes 4.5 °.

[0037]

(Equation 3)

Therefore, the image visually recognized by the user is about 126.
It is close to mm. As for the size of the image at this time, the light emitting portion 114 mm of the light emitting device is felt as it is. Therefore, in order to generate an image image at a distance of 30 cm from the eye (eyepiece), it is necessary to set the congestion angle 2θ ₃ ′ = 12.4 ° from the equation (4).

[0039]

[Equation 4]

Therefore, in the goggle type display 8, according to the equation (5), the deflection angles θ _{4 of the} prisms 501-A and B =
The congestion angle in the goggles 12 was corrected to 12.4 ° by setting it to 8.3 °.

[0041]

(Equation 5)

As a result, the goggle type display 8 reproduces an image image at a distance of 30 cm from the eye. The 30 cm is a desirable distance for humans to read characters.

Further, the goggle section 12 is provided with an interpupillary adjustment knob for adjusting the difference in the interpupillary distance of each observer in consideration of individual differences, and a focus adjustment knob for correcting the variation in the visual acuity of the observer. It may be provided (not shown).

FIG. 7 shows an embodiment of the goggle section 12 which satisfies the above-mentioned conditions such as the optical path length. In the goggles section 12,
In order to secure the above-mentioned optical path length, the light from the light emitting device 304 is guided to the eyepiece lens unit 303 via the fixed reflecting mirror 308 and the rotating reflecting mirror 305.

1.2.2 Arrangement (Miniaturization) Up to now, it has been explained that the newspaper information can be visually recognized by the both eyes by ensuring a predetermined optical path length in the goggle unit 12. Considering the required portability, it is desirable to further reduce the size of the goggle unit 12. An example of the downsized goggle type display 8 is shown in FIG. In this description, a view of a person's head from the side is used, and the optical system, the optical path, etc. are two-dimensionally handled within this plane. In the present invention, the directions perpendicular to this plane may be considered the same.

In FIG. 6, the goggle section 12 has a light emitting device 304 including a plurality of light emitting elements, a fixed reflecting mirror 308 for reflecting the light emitted from the light emitting device 304, and the fixed type. And a rotary reflecting mirror 305 that forms an image of the light from the light emitting device 304 by reflecting the light reflected by the reflecting mirror in a predetermined operation.
A big difference from FIG. 7 is that the light emitting device 304, the fixed reflecting mirror 308 and the light emitting device 304 are arranged so that the light emitted from the light emitting device 304 and the imaged light reflected by the rotating reflecting mirror 305 intersect with each other. This is the point where the rotary reflecting mirror 305 is arranged. Specifically, a rotary reflecting mirror 305 is provided in a horizontal direction with respect to an eyepiece lens 303 for visually recognizing the imaged light, and the light emitted from the light emitting device 304 and the reflected light from the rotary reflecting mirror 305 are combined. So that the imaged light intersects
The light emitting device 304 is provided below the horizontal line connecting the centers of the eyepiece lens 303 and the rotary reflecting mirror 305, and between the eyepiece lens 303 and the rotary reflecting mirror 305, and the eyepiece lens The fixed reflecting mirror 308 is provided between the eyepiece lens 303 and the rotating reflecting mirror 305 above the horizontal line connecting the centers of the 303 and the rotating reflecting mirror 305. The above-described optical path length is ensured by guiding the light from the light emitting device 304 to the eyepiece lens unit 303 via the fixed reflection mirror 308 and the rotary reflection mirror 305.

Details of the above configuration will be described with reference to FIGS.

(A) Light emitting device 304, rotary reflecting mirror 30
5 and the positional relationship between the eyepiece lens unit 303. FIG. 6 shows the conditions for setting the positional relationship between the light emitting device 304, the rotary reflecting mirror 305, and the eyepiece lens unit 303. The width and the tilt of the mirror are shown.

As shown in FIG. 6, the light source P of the light emitting device 304 is connected to the center Q (2) of the fixed reflecting mirror, the rotation center O (2) of the rotating reflecting mirror, and the optical axis of the eyepiece lens. The line that connects them is the nominal optical path. Nominal means the center of the light that is scanned by the rotary reflecting mirror. For the sake of explanation, the position of the image image visually recognized by the observer through the eyepiece lens is P ′, and the extension of the optical path connecting the fixed reflection mirror 308 and the rotary reflection mirror 305 is P ″, OP ″. The angle formed by a line perpendicular to the optical axis of the lens unit 303 is α, and the angle formed by PQ and a line perpendicular to the optical axis of the eyepiece lens unit 303 is β.

In FIG. 6, if the nominal angle ψo of the rotary reflecting mirror 305 is π / 4 (= 45 °), OP ″ is perpendicular to OP ′. Stand up (rotate the reflecting mirror 305 clockwise in FIG. 6 by α
1/2 rotation) and P ″ are tilted toward the eyepiece lens unit 303 side, and the nominal angle ψo of the rotary reflecting mirror 305 is given by formula (6).

[0051]

(Equation 6)

In this case, the angle formed by the fixed reflecting mirror 308 and the optical axis of the eyepiece lens, that is, the inclination of the fixed reflecting mirror 308 is (α-β) / 2.

The width of the fixed reflecting mirror 308 is determined by two straight lines connecting the end of the mirror image of the rotating reflecting mirror 305 generated by this mirror and the light source P of the light emitting device 304. That is, of the light from the light source P, only the light inside these two straight lines is reflected by the fixed reflecting mirror 308 and reaches the rotating reflecting mirror 305. From this, it is understood that the width of the fixed reflecting mirror 308 is useless even if it is more than the width cut by these two straight lines, and the width is determined by this.

Naturally, the straight line on the rotary reflecting mirror 305 side should not be blocked by the rotary reflecting mirror 305.
Similarly, the straight line on the eyepiece lens section 303 side must not be interrupted by the surface of the housing (the surface with the eyepiece lens section 303). However, as long as it is not blocked, it is desirable that the fixed reflecting mirror 308 approaches the surface on which the eyepiece lens unit 303 is attached, which has the effect of thinning the entire housing. Further, the angle α increases as it approaches the surface of the housing, and can take the maximum value. Further, as can be seen from the expression (6), the larger the angle α, the smaller the nominal angle ψo of the rotary reflecting mirror 305, and the mirror of the rotary reflecting mirror 305 stands up, and the vertical angle of view becomes large. There is also an effect to do. From this, the position of the fixed reflecting mirror 308 is
It can be moved by determining the nominal angle ψo of the rotary reflecting mirror 305. At this time, the fixed reflecting mirror 308 is at a position where the angle α is increased (the nominal angle ψ o
It is preferable to place it in a position where the is smaller. This is because the rotary reflecting mirror 305 can reflect on the eyepiece lens unit 303 with an inclination close to the direction perpendicular to the optical axis of the eyepiece lens unit 303. However, that is also the range in which the light from the light emitting device 304 reaches the fixed reflecting mirror 308 without being blocked by the eyepiece lens unit.

(B) The rotation angle of the rotary reflecting mirror 305 and 2
Angle of View of Dimensional Image In the goggle unit 12, the direction of the light entering the eyepiece lens unit 303 from the rotary reflecting mirror 305 is tilted by rotating the rotary reflecting mirror 305 so that it is obliquely downward or oblique to the eyes of the observer. A two-dimensional image is obtained by being incident as light from the upper side. Therefore, it is necessary to emit light from the light emitting device 304 when the rotary reflecting mirror 305 is within a certain range before and after the nominal angle ψo, that is, within a range in which light can be guided to the eyepiece. The angle of view of the two-dimensional image viewed by the observer is twice this angle because of specular reflection.

8 and 9, the case where light is emitted from the light emitting device 304 in the range of ψ1 (= ψo-Δψ1) to ψ2 (= ψo + Δψ2) in the goggles will be described.

Angles of view θ1, θ2 of the two-dimensional image viewed by the observer
Is calculated by the relationship of the equation (7). (Rotary reflector 305
Is large enough. )

[0058]

(Equation 7)

When θ1 = θ2, Δψ1 = Δψ2.

The size of the rotary reflecting mirror 305 required to satisfy this is obtained by calculating a / r _1,2 from equation (8) with the radius of rotation r _1,2 .

[0061]

(Equation 8)

As long as the mirror is rotated, one side is twice the larger length obtained here. Therefore, r1
Is larger than r2, the angle is larger than θ2 for a mirror having a radius of gyration r1.

Here, the distance from the rotary reflecting mirror 305 to the eyepiece lens unit 303 is a parameter, but this value is the value of the mirror image of the light source of the light emitting device 304, the rotary reflecting mirror 305, and the fixed reflecting mirror 308. The two lines connecting the ends on the side of the rotary reflecting mirror 305 emit light from the light emitting device 304.
It is desirable to keep the length as short as possible under the condition that light is not blocked in the range of 1 (= ψo-Δψ1) to ψ2 (= ψo + Δψ2). The light emitting device 304 is linear and has a small width (6 mm in this embodiment).
The distance between the rotary reflecting mirror 305 and the eyepiece lens unit 303 can be made very small by bringing the light emitting source of the above-mentioned item to the eyepiece lens unit 303 as close as possible.

(C) Optical System Arrangement Determining Method Although the optical arrangement is determined under the conditions described above, the deciding method is the following iterative calculation.

(0) Setting of required conditions Field of view: Set required values for the fields of view θ1 and θ2 of the eyepiece lens unit 303.

Optical path length: The optical path length is determined by the viewing angle of the eyepiece lens.

Geometrical arrangement: The light source position of the light emitting device 304, the position of the eyepiece lens unit 303, the optical axis direction of the eyepiece lens unit 303, and the rotation center of the rotary reflecting mirror 305 are on the same optical axis.

(1) Assumption The radius of gyration of the rotary reflecting mirror 305, the nominal angle, and the distance between the center of rotation of the rotary reflecting mirror 305 and the eyepiece lens unit 303 are assumed.

(2) Calculation Fixed reflecting mirror 308: Position, size, tilt angle Rotating reflecting mirror 305: Swing angle, turning radius (3) Judgment Whether light is blocked or there is no other contact, miniaturization is sufficient Determine if it is done.

(4) Feedback Based on the judgment result of (3), the assumption of (1) or the requirement of (0) is corrected.

Next, the terminal section for transmitting the image data to the goggle section will be described.

2. Terminal section Terminal section 1 of goggle type display 8 shown in FIG.
1 will be described.

As described above, the goggle type display employs the LED array of 1792 dots in order to reproduce the character information at the resolution of 200 dpi.
When the data input to the LED array is performed with a clock of 20 MHz which is the limit of the shift register, the shift time alone requires 89.6 μs per line, and the user is projected on the goggle unit 13. The image image cannot be visually recognized as a still image.

Therefore, in the terminal section 11, the image data is
By converting the image data into a predetermined array and dividing the image data for one line and transmitting it to the LED array 304, the shift time per line is about 5 μs (one screen scanning time 1
0 ms, for a high-definition image of about 2,000 vertical lines). Specifically, the LED array 304 includes two shift registers 501 each of which is configured in units of 64 bits.
By providing eight shift registers 501 and changing the input to each shift register 501 to 28 independent serial inputs, and shifting these 28 shift registers in parallel by 64 bits with a clock of 20 MHz, 28 times more than in the past. It enabled data transfer at a speed (3.2 μs).

When transferring at a higher speed than this, L
It is good to divide ED and reduce the number of bits to shift,
The number of input lines becomes too large, and it is necessary to further increase the number of bits of the cable and the image memory circuit 406 for outputting data, which causes a problem that the circuit scale and the like increase. For this reason, the terminal unit 11 adopts division in units of 64 bits. L as above
By dividing the EDs and inputting them in parallel, it is possible to satisfy the image data transfer rate required to realize a high-definition image without flicker (flicker) by high-speed scanning.

The structure of the terminal unit 11 is shown in FIG. Its main components are image memory circuit section 406 which holds the image data on the newspaper and outputs it to LED printer head 304, synchronizing circuit section 407 for screen synchronization, and image data input to the terminal. Recording medium unit 404, a memory unit 403 for temporarily holding image data input from the recording medium 408, a compression / decompression unit 405 for compressing / decompressing image data, a processor for input / output at a terminal and data processing A unit 402 is an operation unit 401 that controls the operation of the terminal (image enlargement / reduction, page switching). More specifically, the memory unit 403 has a function of temporarily holding the image data from the recording medium 408 in the terminal unit because the image data is about 2 Mbytes per page. It is also used as a memory area for image processing such as thinning.

The compression / decompression unit 405 fetches the compressed data from the recording medium 408 and performs the decompression operation.
Transfer the decompressed data to 3. This compression / decompression section 405
Is composed of a dedicated LSI and peripheral circuits.

The processor section 402 controls all operations of the terminal section. Image processing operations such as data transfer to the image memory 410, fetching of data from the recording medium 408, control of the compression / expansion unit 405, enlargement / reduction of display image / page switching / scrolling are performed. Various operations,
It is executed by sending an interrupt signal from the operation unit 401 to the processor unit 402.

When the user wants to change the operation of the terminal, the operation unit sends a command so that the processor unit 402 executes the program and changes the state. Specifically, page switching of the display image, enlargement / reduction,
Image processing such as scrolling is performed.

The processing operation of the terminal section 11 will be described in detail below.

2.1 Data Transfer to LED The processing flow in the terminal unit 11 will be described with reference to FIGS. 9 and 10.

First, the image data to be input to the terminal section 11 is stored in the recording medium 408, and the recording medium 408 is inserted into the recording medium section 404. The image data on the recording medium 408 is, for example, newspaper data,
One page of newspaper is 3,232 × 4,736-bit (A2 size 200 dpi, A4 size 400 dpi) binary image data. Therefore, for a recording medium having a smaller capacity than the total amount of data, the data is compressed and stored (step 100). Next, it is determined whether the image data stored on the recording medium 408 is compressed data (step 101). In the case of compressed data, the data is transferred to the compression / expansion unit 405, and the data expansion processing is performed (step 102). However, if it is not compressed on the recording medium 408, the process directly proceeds to the next state. The image data recorded on the recording medium by this processing becomes uncompressed data (original binary image data), and the memory unit 40
3 and is held (step 103). Next, the binary image data held in the memory unit 403 is transferred to the image memory circuit unit 406 after the array conversion process is executed by the processor unit 402 (step 104). Here, the array conversion processing means that, as shown in FIG. 11, one line of data of the original image is horizontally divided into blocks of 64 bits each, and the data of each block (1-28 blocks) is converted into an image memory circuit unit. The image memory 410 of 406 (the image memory 410 will be described later) is arranged in the address direction corresponding to 1 to 28 bits.

By such array conversion processing, 64-bit image data is output from each bit of the image memory 410 according to the address (step 105), and is input to each block corresponding to the LED array 304. One line of the image is reproduced (step 106). By performing a series of processing including this array conversion on each horizontal line of the image data of the original image and sequentially arranging them in the image memory 410, reproduction and display of a high-definition image are realized.

In step 104 described above, the original 3,232 × 4,736 bit data is replaced by the adjacent two.
The logical sum of the bits is taken, and if either one is black (1), the data is thinned out to 1 in the horizontal and vertical directions, and the data (1, 616 x 2,36
By transferring 8) to the image memory 410, it is possible to display a reduced screen, and it is also possible to display one newspaper page. The selection of the enlarged image / reduced image (switching of display) is realized by transmitting an arbitrary signal to the processor unit 402 by pressing the enlargement / reduction button of the operation unit 401.

2.2 Processing operation in the image memory circuit section 406 Here, the image memory circuit section 406 which becomes the transmission section of the image data to the LED array 304 in the terminal section 11
Will be described in detail. 12 and 13 show the configuration and processing operation of the image memory circuit unit 406.

In FIG. 12, the image memory circuit unit 406
Is an image memory 4 that holds image data that has undergone array conversion.
10, a memory access request arbiter 406b requesting switching of writing / outputting of image data to / from the image memory 410, and image data to / from the image memory 410 in response to a signal from the memory access request arbiter 406b. Address multiplex circuit 412 for switching the write address / output address of the image, the screen horizontal direction control counter 406c for counting the column component of one line of the image image to be reproduced, and the line component of the image image to be reproduced Screen counter 406
a, an LED control circuit for transmitting signals such as latches and strobes to the LED array 304. In this embodiment, the image memory 410 is a VRAM (Video RAM) having a serial input / output port. The image memory 410 used is a DRAM (D
It is composed of a dynamic RAM) section and a register section capable of holding data for one row (one row) of the DRAM, and the register section enables serial data multi-input transfer (parallel processing). Equipped with a serial port. The image memory 410 can hold image data of 2048 × 4096 dots = about 1 MByte. In this embodiment, 28 bits of the output data bus of 32 bits included in the VRAM itself are LE.
It is used as an output port to the D array. Therefore, the image memory 410 stores, for example, one page of newspaper page 3,2.
2,048 × of binary image data of 32 × 4,736 bits (A2 size 200 dpi, A4 size 400 dpi)
4,096 bit dots are held by making one pixel correspond to one bit. Therefore, the actually effective image data is 1,792 × 4,096 bits.

The image memory circuit shown in FIG. 12 is characterized in that the processor peripheral circuit for accessing from the processor unit 402 and the serial output peripheral circuit for serial output are independent of each other.

Here, the processor peripheral circuit is a circuit for writing the image data sequentially sent from the processor unit 402 into the image memory 410, and R
The memory access request arbiter 406b serves as an AS (row address strobe) and CAS (column address strobe) timing circuit, an address multiplex circuit, and the like.

That is, when the image data is sent from the processor unit 402, the image data is sent to the image memory 41.
Memory access request arbiter 4
An address corresponding to the image data is given and written via 06b. At this time, the address multiplex circuit 412 recognizes that the address given to the image memory 410 is for writing.

On the other hand, the serial output peripheral circuit is a circuit for outputting the image data written in the image memory 410 to the LED array.

Specifically, when the image memory 410 performs serial output, the row address and the column address which are time-divided to the image memory 410 are used to output the data for one row according to the column address. Output serially. Therefore, in the serial output peripheral circuit, the column address is always zero (the column address is not input to the image memory), and the row address is only given by the screen line counter 406a. As a result, the image memory 410 only needs to give an arbitrary row address from the address multiplex circuit 412, and
Row data is output in the order of column addresses. When the output of the data for one row is completed, the screen horizontal direction control counter 406c instructs the memory access request arbiter to output the data for the next one row.

The arbiter circuit 40 is provided so that the image memory accesses of the two independent peripheral circuits do not collide.
6b, the address bus is time-divisionally output by the data selector, and the access by the processor unit 402 and the data output access are exclusively executed.

Next, FIG. 13 shows an output processing flow of the image memory circuit section 406.

First, the state immediately after the screen horizontal direction control counter (512-base counter) 406c and the screen line counter (512-base counter) 406a are reset by the input of the synchronization signal sent from the synchronization circuit 407 will be described. To start.

The screen horizontal direction control counter (hereinafter referred to as the horizontal direction counter) is added according to the data output clock frequency of the image memory 410 (step 501). That is, the counter of the horizontal counter is incremented by outputting the data in bit units from the image memory 410. Since one line of the display screen is formed by sending 64 dots from each serial port to the LED, addition is performed until the horizontal counter becomes a multiple of 64 (step 502). If the horizontal counter becomes a multiple of 64 in step 502, the horizontal counter 4
06c is LE through the LED control circuit 411.
A data load signal is sent to D (step 50).
3). By such processing, the data output for one line is completed. Similarly, the processing for the second and subsequent lines is performed.

Next, when the horizontal counter 406c reaches 512 (step 504), the access address of the image memory is advanced by 1, so that the screen line counter 406a is incremented.
(Hereinafter referred to as a vertical direction counter) is added (step 505). The reason for performing this processing is that the image memory 410 in this embodiment outputs the data through the serial access port (SAM section) having 512 addresses in the column direction.
This is because, when outputting every 64 bits, it is necessary to add the row address after displaying 8 lines and transfer the data of the next row address to the serial access port register (step 506). When this image memory read transfer (from the DRAM section to the SAM section) is completed, the horizontal counter is reset (step 507).

On the other hand, when a synchronizing signal is input from the synchronizing circuit section 407 (step 508), the horizontal counter and the vertical counter are reset by the synchronizing signal (step 509), and the process returns to step 501 to perform the same processing. To do.

By repeating the above steps 501 to 509, the same image data is output to the LED according to the rotation of the rotation boundary.

2.3 Processing Operation in LED Array 304 The processing operation of the LED array 304 will be described with reference to FIG.

In the LED array 304, 28 pieces of array-converted image data sent from the above-mentioned image memory circuit section 406 are input to 28 shift registers 501 provided in the LED array 304. When the data for one line (1792 dots) is input to the shift register 501, the bit output of each shift register 501 is latched in the latch 502. The data latched by each latch 502 is sent to the LED driver 504 by a strobe signal, and L
The ED driver 504 is LE according to the sent data.
Make D emit light. Here, the strobe signal is a signal for controlling the light emitting operation of the LED array, and when the strobe signal is not generated, the LED array does not emit light regardless of the presence or absence of data. This prevents unnecessary light emission of the LED and saves power.

2.4 Processing Operation of Synchronous Circuit Section The principle of the synchronous circuit section will be described with reference to FIG. In order to realize a still high-definition image, the image memory circuit unit 4
The output from 06 (LED lighting) is used as the rotary reflecting mirror 30.
It is necessary to synchronize with the rotation cycle of 5. That is, it is necessary to obtain image data output timing such that the same data is always output for a certain displacement angle of the rotary reflecting mirror 305. In order to achieve this purpose, a sensor 307 that detects that the rotation axis has reached a certain displacement angle and outputs a signal to the outside is attached to the rotation axis of the rotary reflecting mirror 305 of the goggles. The synchronizing circuit section 407 for generating a start timing signal for image output in response to the above signal is incorporated in the terminal section. In this embodiment, the sensor 307 is the photo interrupter 30.
7b is adopted. The photo interrupter 307b is LE
It is composed of D and a photo coupler, and an object outputs a signal by blocking light from the LED between the slits. Therefore, the shield plate 307 is attached to the rotation axis of the second reflecting mirror 305.
When a is attached and the plate passes through the slit of the photo interrupter 307b, a synchronizing signal is generated.

Next, the synchronous circuit section 407 in the present embodiment.
The operation will be described with reference to FIG. Sensor 307
The synchronizing signal from is input to the synchronizing circuit unit 407. Using this synchronization signal, the 512-base counter for setting the row address of the output from the image memory 410 is reset. By this operation, when the displacement angle of the rotary reflecting mirror 305 reaches a certain angle (position), the head (first line) of the image is always output. As a result, since the transfer speed and the rotation speed of the image data are constant, the same image is always displayed from the first line of the image, and the synchronization is realized.

Further, by making the relative time interval between the synchronizing signal from the sensor 307 and the reset pulse to the counter variable, the timing of outputting the beginning of the image can be finely adjusted. This allows the display image to be moved up and down. In this embodiment, a pulse length variable circuit using a multivibrator is used.

Further, since the rotary reflecting mirror 305 is rotating, the LED 304 is above and below the image.
Must be off. Therefore, in synchronization with the reset pulse of the above screen, L with the width of the lighting time
Generates the strobe signal of ED304, and LED304
Light up. In this embodiment, the display range of the screen can be adjusted in the vertical direction by making the lighting pulse length variable. In addition, the lighting pulse length of the LED 304 for each line of the display image is also made variable so that the brightness of the entire screen can be adjusted.

[0105]

According to the present invention, in an information display terminal using an LED array, it is possible to provide a miniaturized structure that can be worn on the head. As a result, it is possible to provide an information display terminal having excellent portability with respect to a medium that handles character information.

Further, the information display terminal can be realized not only with a simple structure of an LED array, a rotary mirror and a fixed mirror using an existing display element, but also with an LE.
Since the miniaturization is achieved by considering the three arrangements of the D array, the rotary reflecting mirror, and the fixed reflecting mirror, the light emitted from the LED array is sequentially scanned by the rotary reflecting mirror to obtain a simple conventional structure The principle of can be applied as it is.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a usage form of the present invention.

FIG. 2 is an external view of the present invention.

FIG. 3 is a diagram showing a structure of a goggle portion of the present invention.

FIG. 4 is a diagram showing a light emitting device of the present invention.

FIG. 5 is a diagram showing conditions for making the light emitting element of the present invention visible with both eyes.

FIG. 6 is an embodiment showing a structure of a downsized goggle portion of the present invention.

FIG. 7 is an example showing a structure of a downsized goggle portion of the present invention.

FIG. 8 is a diagram showing design conditions of a downsized goggle portion of the present invention.

FIG. 9 is a functional block diagram of a terminal unit of the present invention.

FIG. 10 is a flowchart showing processing in the terminal unit of the present invention.

FIG. 11 is a diagram showing a relationship between an image memory layout of image data and output according to the present invention.

FIG. 12 is a block diagram of an image memory circuit of the present invention.

FIG. 13 is a flowchart showing processing in the image memory circuit of the present invention.

FIG. 14 is a diagram showing data input to the LED printer head of the present invention.

FIG. 15 is a principle diagram of a synchronization method of the present invention.

16A and 16B are a block diagram of a synchronizing circuit and a timing schematic diagram of the present invention.

[Explanation of symbols]

 5 recording medium 8 goggle type display 11 terminal section 14 goggles section 303 eyepiece section 304 light emitting element 305 rotary reflecting mirror 306 driving apparatus 307 sensor 308 fixed reflecting mirror 401 operating section 402 processor section 403 memory section 404 recording medium section 405 compression / Expansion unit 406 Image memory circuit unit 407 Synchronous circuit unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromi Harada 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock company Hitachi Information & Communication Division

Claims (2)

[Claims] 1. A light emitting device comprising a plurality of light emitting elements, and a first reflecting mirror for reflecting light emitted from the light emitting device.
A second reflecting mirror that forms an image of the light from the light emitting device by reflecting the light reflected by the first reflecting mirror in a predetermined operation, and the light emitted from the light emitting device and the second reflecting mirror. An information display terminal, wherein the light emitting device, the first reflecting mirror, and the second reflecting mirror are arranged so that the imaged light reflected by the reflecting mirror intersects with each other. 2. The second reflecting mirror is provided horizontally with respect to the eyepiece lens for visually recognizing the imaged light, and the light emitted from the light emitting device and the image reflected by the second reflecting mirror are formed. The light emitting device is provided between the eyepiece lens and the second reflecting mirror below a horizontal line connecting the centers of the eyepiece lens and the second reflecting mirror so that the light intersects. And the first reflecting mirror is provided above the horizontal line connecting the centers of the eyepiece lens and the second reflecting mirror and between the eyepiece lens and the second reflecting mirror. The information display terminal according to claim 1.