JP3196805B2 - Display device and portable electronic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device and a portable electronic device using a two-axis movable mirror (electrostatic movable mirror), and more particularly, to an ultra-compact, two-axis movable mirror (electrostatic movable mirror). The present invention relates to a display device and a portable electronic device with low power consumption.

[0002]

2. Description of the Related Art Heretofore, in portable notebook personal computers and the like, a flat display (display device) using liquid crystal, plasma emission, or the like has been usually used for displaying data input / output. A flat display using liquid crystal or plasma light emission requires a display having a corresponding number of pixels in order to perform a display necessary for practical use. CRT displays, which are widely used in top-type computers, are too heavy and have been selected as smaller and lighter display mechanisms, and are said to be used because there are no smaller and lighter display devices. Not too much.

In addition to the above-described display device for directly displaying information, there is a device such as a laser printer / plotter or a large-screen laser display device for projecting light to a desired position to display information.

[0004]

However, although the above-mentioned conventional flat display (display device) is lightweight, for example, in a liquid crystal display, pixels are formed on a glass plate having an area corresponding to the display area. Therefore, there is a problem that as the display area increases, the weight becomes inevitably heavy.
In addition, there is a problem that a large amount of power is required for the backlight.

Further, in the conventional laser printer / plotter and the large-screen laser display device, a light beam having a fixed direction such as a laser with low power consumption is deflected in an arbitrary direction for display. It is necessary to use two mirrors that can move correspondingly to two orthogonal angle parameters θ and φ in a rotating coordinate system. Since the deflected positions are physically different for each of the angle parameters θ and φ, the mirror (reflecting mirror) interval, which does not pose any problem when viewed from infinity, is a problem in controlling the deflected angle.

In order to avoid this, control is performed using angle parameters θ and φ.
If the mirror is given two degrees of freedom in order to perform the same circuit, the gimbal (earth sesame) structure must be adopted for the support mechanism shown in FIG. was there. In FIG. 6, 61 is a mirror (reflection mirror), 62 is an inner wheel axis, 63 is an outer wheel axis, 64 is a pivot in the angle parameter θ direction, and 65 is a pivot in the angle parameter φ direction.

Further, since the earth sesame structure has a dynamically large movable mass and a different inertial mass depending on the supporting direction,
Since the mechanical frequency characteristics are different, it is impossible to control the angle parameters θ and φ with completely the same circuit characteristics and driving power when performing high-performance declination control.

An object of the present invention is to make it possible for a light spot to scan at a constant speed on a screen on which a light beam is projected by displacing a movable part in two axes, and to have a strictly symmetrical structure with a simple structure. An object of the present invention is to provide a light-weight, low-power-consumption display device using a two-axis movable mirror (electrostatic movable mirror) that can move in two axes.

[0009]

Another object of the present invention is to provide a portable display device which is lightweight and consumes low power.

Another object of the present invention is to provide a portable electronic device which is lightweight and consumes low power.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0013]

The outline of a typical invention among the inventions disclosed in the present application will be briefly described as follows.

[0014]

That is, the present invention provides a screen,
A linear light source that produces a narrow light beam projected on the lean
From the linear light source projected on the screen
A two-axis movable mirror for deflecting a thin light beam;
Of a thin light beam from the linear light source projected on the
The two-axis movable mirror so that the light spot is scanned at a constant speed.
Means for controlling the deflection of the light source, and a light source synchronized with the scanning.
Means for flashing and displaying an image.
The two-axis movable mirror has a reflecting mirror provided on the upper part.
And a pickled bowl-shaped mirror plate made of a magnetic metal;
Pickpocket-shaped concave provided on the back side of the mirror of the mirror plate
A needle-shaped pivot at the center where the bottom is mounted
Mirror and the mirror so as to face the mirror plate.
While being placed on the table insulated from the mirror table,
First and second electrodes arranged to be orthogonal to each other
A pair, a permanent magnet disposed below the mirror base,
Magnetic yaw placed around the entire mirror stand
And is characterized by comprising.

Further , the present invention provides a main body part and a front part when not in use.
The screen that is folded and stored on the main body
An optical scanning mechanism housed in the main body during use.
The optical scanning mechanism is projected on the screen.
A linear light source for producing a narrow light beam
A thin light beam from the linear light source projected on the
A two-axis movable mirror that deflects the light,
A thin light beam from the linear light source projected on the screen
2-axis movable so that the light spot of the beam is scanned at a constant speed
Means for controlling the deflection of the mirror, and light synchronized with the scanning.
Means for blinking the source and displaying an image
The device, wherein the biaxial movable mirror has a reflecting mirror on an upper part.
Pickled bowl-shaped mirror plate provided and made of magnetic metal
And a slot provided on the back side of the reflecting mirror of the mirror plate.
Needle-shaped pivot in the center with a pot-shaped concave bottom
Having a mirror base and a front so as to face the mirror plate.
When placed on the mirror stand insulated from the mirror stand
Both the first and the second are arranged so as to be orthogonal to each other.
Two electrode pairs and a permanent magnet disposed below the mirror base.
It is arranged so as to surround the stone and the entire mirror base
And a magnetic yoke.

According to the present invention, there is provided a portable display device as described above.
It is a portable electronic device provided as a display unit.

[0018]

According to the above-mentioned means, the first and the second orthogonal to each other are provided.
When a voltage is applied to the second electrode pair and the second electrode pair, a potential difference (potential difference due to static electricity) is generated in the mirror plate, and the mirror plate rotates around the needle-like tip of the pivot so as to approach the electrode direction. Since the first and second electrode pairs are arranged orthogonally to each other, a predetermined biaxial rotation around the pivot is achieved by applying a voltage of opposite amplitude to each pair of orthogonal electrodes. Can be done. By inputting a normal unbalanced signal, the operation amplified output Q and bar Q are obtained. Since the amplitude symmetry is very good except for the opposite sign, one side of the pivot needle centered on the needle-like tip is used. As the repulsion increases, the attraction on the opposite side increases by the difference, the force applied to the pivot is always constant, and the occurrence of vibration due to the movement of the electrostatic movable mirror decreases.

Further, since the magnetic field lines of the permanent magnet form a closed magnetic circuit using the mirror plate and the magnetic yoke as a magnetic circuit, when the application of the voltage is released, the electrostatic movable mirror becomes independent at a position where the energy of the entire magnetic circuit becomes minimum. Is set to If the mirror plate is designed so that the distance from the magnetic yoke is minimized in a state where the mirror plate is parallel to the mirror stand, the position will have the minimum energy. The movable mirror returns to the initial position.

Further, since the positions are made parallel by using a permanent magnet, the mirror plate is naturally attracted to the magnet when there is no pivot. This means that the state supported by the pivot is not at the minimum energy, and the mirror plate is always subjected to a force pushing in the direction of the magnet.
Therefore, even if the position of the electrostatic movable mirror and the mirror base is changed simply by placing the movable on the pivot, even if it is extremely turned upside down, there is no problem in the operation, and the two-axis movable mirror has a very simple component configuration. (Electrostatic movable mirror) can be realized.

As described above, a movable mirror (electrostatic movable mirror) that can move biaxially with strict symmetry with a simple configuration can be realized very easily, so that the power consumption and the size of the light beam projection display can be reduced. Very advantageous.

Further, by swinging the angle of the electrostatic movable mirror right and left and up and down, for example, in a sinusoidal manner, the pixel information stored in the video memory for each line is displayed as normal or reverse, and If the display speed and light intensity are modulated in proportion to the speed on the screen, the image can be displayed without any change by silent observation.

Further, by incorporating the screen and the optical scanning mechanism in a foldable manner, the display device can be reduced in size and weight.
Because it can be quantified, it can be carried.

Further, an information input / output device and a processing device are provided at predetermined positions of the portable display device of the present invention, and the information input / output device and the information processing device are electrically connected to the input / output unit of the portable display device. By connecting, that is, the portable type of the present invention
By providing the display device as a display portion, a portable electronic device such as a portable notebook personal computer and a portable word processor can be easily obtained.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a side view showing a schematic configuration of a portable data input / output device according to an embodiment of the present invention. FIG. FIG. 3 is an explanatory view for explaining the structure of the optical scanning mechanism of the present embodiment, FIG. 4 is a perspective view showing the structure of a two-axis deflecting mirror used for optical scanning, and FIG.
FIG. 5 is a sectional view taken along line AA in FIG. 4.

In the portable data input / output device of this embodiment, as shown in FIG. 1, when not in use, the folded screen 1 and optical scanning mechanism 2 are pulled out in this order and set in a predetermined positional relationship. In the example of FIG. 1, the screen 1 is about twice as large as the width of the keyboard (information input device) 3 of the main body , and is installed at a distance corresponding to the width of the keyboard 3. The optical scanning mechanism 2 may be raised by hand or automatically come to a predetermined position in a pop-up manner. Since the user is at a position where the keyboard 3 can be operated, from the viewpoint, as shown in FIG. 2, by appropriately setting the height of the optical scanning mechanism 2, the screen 1 (display unit) is not hidden. come.

When a thin light beam (laser beam) is emitted from the light scanning mechanism 2 and raster scanning is performed at a high speed so as to draw a predetermined trajectory on the screen 1, the display side of the screen 1 is viewed from the user side by the afterimage effect of the eyes. Appears to be illuminated on the entire surface. When this light beam blinks (blinks) corresponding to a predetermined position on the screen 1, FIG.
As shown in the enlarged schematic display diagram of FIG. 1, an image such as a character can be displayed on the screen 1.

In this case, if a laser beam is used as a light beam, for example, as compared with a backlight which requires the most power in a normal liquid crystal display, even if the entire surface of the laser diode is brightly displayed, the laser diode will Display can be performed with power of several milliwatts or less, which is 1/1000 or less of the power of the backlight, and the battery life, which is the most problematic in portable devices, can be greatly extended.

Next, the structure and operation of the optical scanning mechanism of this embodiment will be described with reference to FIG. In FIG. 3, 2
1 is a semiconductor laser, 22 is a condenser lens, 23 is a micro biaxial movable mirror, 24 is a transparent window, 25 is a lens barrel, 31 is a laser drive circuit, 32 is a scan synchronization circuit, 33 is a video memory, and 34 is an operation unit , 35 are mirror driving circuits.

The arithmetic unit (CPU) 34 has a general computer configuration including a memory and a peripheral control circuit, and the display output is output to the video memory 33 in the same manner as the output to the display of a normal personal computer. .

The data input to the video memory 33 is
The laser drive circuit 31 is synchronized with the scan synchronization circuit 32
, And becomes an LD signal for controlling the blinking of the laser. At the same time, a signal for controlling the vertical and horizontal deflection angles of the micro biaxial movable mirror (electrostatic movable mirror) 23 is transmitted from the mirror driving circuit 35 in synchronization with the signal of the scan synchronization circuit 32. This operation is exactly the same as the vertical (horizontal) and horizontal (horizontal) deflection of an electron beam in a cathode ray tube. In the case of a cathode ray tube, the electron beam is deflected by an electromagnet. Mirror 23
Light is deflected by a (two-axis electrostatic movable mirror).

Although the angle to be deflected naturally depends on the projection position, it is easy to control the angle of the screen 1 and the dimensional relationship of the optical scanning mechanism 2 because they are known in advance.

Conventionally, there has been no example of such light manipulation. For example, a laser display or the like uses an argon laser light or the like and draws a line drawing on a wall or a cloud of a building or the like. Had been. However, conventionally, since two one-axis mirrors are controlled orthogonally to each other, the device becomes large-scale, the angular velocity required for operation is small, and such a small and portable device is required.
It could not be applied to a lightweight raster scan type display device.

The present invention is different from the conventional technology in that the control is simplified by using a two-axis movable mirror having two degrees of freedom, and the light deflection center is set to the center of the mirror swing. By matching, the light can be scanned only by changing the angle of the focal point portion. Therefore, it is noted that the mirror may be extremely small, and a very lightweight and compact dish-shaped micro mirror (micro biaxial movable mirror 2)
This is realized using 3).

The micro two-axis movable mirror 23 of this embodiment
As shown in FIG. 4, for example, a counterclockwise electrostatic movable mirror 23a is used. This dish-rotating electrostatic movable mirror 23a
Is a filet-shaped mirror plate 23a ″ made of a magnetic metal.
A reflection mirror 23a 'is provided above the mirror plate 2, and the mirror plate 2
A pick-up recess is provided on the back side of the reflecting mirror 23a 'of 3a ", and the bottom of the pick-up recess is mounted on a needle-like pivot 23b provided at the center of the mirror stand 23c. The first and second electrode pairs 23d orthogonal to each other are arranged in a portion facing the mirror plate 23a "insulated from the mirror base 23c. Further, a permanent magnet 23e is arranged below the mirror base 23c, and a magnetic yoke 23f is arranged so as to surround the entire mirror base 23c.

When a voltage is applied to each of the orthogonal electrodes 23d through the lead wire 23g, the mirror plate 2c is connected to the mirror base 23c and, hence, to the electrically connected pivot 23b.
A potential difference (potential difference due to static electricity) is generated in 3a ″, and the mirror plate 23a ″ (micro biaxial movable mirror 23) rotates around the needle-like tip of the pivot 23b so as to approach the electrode direction. Since the electrodes are arranged orthogonally, the orthogonal electrodes 23 are connected via a circuit having a differential amplifier configuration as shown in FIG.
By applying a voltage of opposite amplitude to each pair of d, a predetermined two-axis rotation around the pivot 23b can be performed. In FIG. 4, the operation amplification output Q and bar Q are obtained by inputting a normal unbalanced signal. Since the amplitude symmetry is very good except for the opposite sign, the pivot 23
When the repulsive force on one side increases with the needle-shaped tip of b as the center, the attractive force on the opposite side increases by the difference, the force applied to the pivot 23b is always constant, and the generation of vibration due to the movement of the mirror is generated. And so on.

Since the magnetic lines of force of the permanent magnets 23e constitute a closed magnetic circuit using the mirror plate 23a "and the magnetic yoke 23f as a magnetic circuit, when the application of the voltage is canceled, the mirror plate 23a" ( The micro two-axis movable mirror 23) is set independently. Mirror plate 23
a ″ (micro two-axis movable mirror 23) is mirror base 23c
If the distance between the magnetic yoke 23f and the magnetic yoke 23f is designed to be minimum in a state parallel to the above, the position will have the minimum energy, so that it always returns to the initial position with a restoring force without using a preset spring.

Further, since the positions are made parallel by using the permanent magnets 23e, the mirror plate 23a "is naturally attracted to the magnets when there is no pivot 23b.
This means that the state of being supported by the pivot is not at the minimum energy, and the mirror plate 23a "always has a pressing force acting in the direction of the magnet.
a "is simply placed on the pivot 23b, and the mirror plate 23a"
There is no problem in operation even if the position of the mirror base 23c is changed or turned over extremely, and the two-axis micro two-axis movable mirror (electrostatic movable mirror) has a very simple component configuration.
23 can be realized.

By oscillating the angle of the micro biaxial movable mirror (electrostatic movable mirror) 23 right and left and up and down, for example, in a sinusoidal manner, the light spot on the screen 1 (FIG. 1) is as if by a CRT. Moving at high speed like an electron beam,
Scan a surface. For example, in the case of NTSC television, top and bottom scans are performed 60 times per second, left-to-right line scans are performed in 63 μs, and returns are performed in a few microseconds. Are also well known. Unfortunately, no matter how lightweight the micromirror is, scanning with an electron beam requires a large driving force, and CRT display is not a good idea for reducing power consumption. However, the micro biaxial movable mirror (electrostatic movable mirror) 23 swings in a sinusoidal manner, and the pixel information stored in the video memory 33 is displayed as normal or reverse for each line, and the light spot screen 1 is displayed.
If the display speed / light intensity is modulated in proportion to the speed shown in FIG.

The size of the reflecting mirror 23a "is sufficient if the beam diameter of the light is 0.1 to 0.3 mm and 1 mmφ is sufficient, and the mirror plate 23a only reflects light.
The thickness of a ″ is very small, for example, about 10 μm, so that there is no problem at all, and a very lightweight movable mirror can be obtained. It is clear when recalling Leidenbin's experiment, taught by junior high school science, without waiting for the operation analysis of the micromachine.

Also, one of the features of the movable mirror of the present invention is that the power consumption is extremely small because of the electrostatic drive.

Further, since the characteristics of the angle parameters θ and φ can be completely the same in both directions, it is only necessary to prepare two identical circuits. In the case where two conventional one-axis mirrors are combined or the earth sesame type movable mirror is used. Since it is not necessary to use circuits having different characteristics as in the case of using the circuit, the adjustment is easy.

Although not shown, if an information processing device is connected to the input / output processing circuit of the portable data input / output device of this embodiment, a portable electronic device such as a portable notebook personal computer or a portable word processor can be obtained. Obtained easily.

As described above, the present invention has been specifically described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention. Absent.

[0046]

The effects of the typical inventions disclosed by the present application will be briefly described as follows.

[0047] According to (1) the present invention, it is possible to obtain a simple strict symmetry well biaxially movable biaxially movable mirror in the configuration (electrostatic movable mirror) very easily. According to this two-axis movable mirror (electrostatic movable mirror), it is possible to displace the movable part in two axes and scan a light spot at a constant speed on a screen on which a light beam is to be projected. Accordingly
Use this two-axis movable mirror (electrostatic movable mirror).
Lightweight, low power consumption light beam projection display
Can be obtained.

(2) According to the present invention, a portable display device that is lightweight and consumes low power can be obtained .

[0049] (3) According to the present invention, it is possible to obtain a portable electronic device with low power consumption easily lightweight.

[0050]

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of a portable data input / output device according to an embodiment of the present invention.

FIG. 2 is an overhead schematic view from the user of the portable data input / output device of the present embodiment in an actual use state.

FIG. 3 is an explanatory diagram for explaining a structure of an optical scanning mechanism according to the embodiment.

FIG. 4 is a perspective view showing a structure of a biaxial deflection mirror used for optical scanning according to the present embodiment.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a perspective view showing a schematic configuration of a conventional rotary mirror having a sesame structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Screen, 2 ... Optical scanning mechanism, 3 ... Keyboard, 21 ... Semiconductor laser, 22 ... Condensing lens, 23 ...
Micro two-axis movable mirror, 24: transparent window, 25: lens barrel,
31 ... laser drive circuit, 32 ... scan synchronous circuit, 3
3 video memory, 34 arithmetic unit, 35 mirror drive circuit, 23a statically movable mirror, 23a '' mirror plate, 2
3a ': Reflecting mirror (mirror), 23b: Pivot, 23c
... Mirror stand, 23d ... electrode, 23e ... permanent magnet, 23f
... magnetic yoke, 23g ... lead wire.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02B 26/00-26/10

Claims (3)

(57) [Claims] 1. A screen and a narrow light beam projected onto said screen.
A linear light source and a thin line from the linear light source projected on the screen
A two-axis movable mirror for deflecting a light beam, and a thin mirror from the linear light source projected on the screen;
In order to scan the light spot of the light beam at a constant speed,
Means for controlling the deflection of the axis movable mirror, and means for displaying an image by blinking a light source in synchronization with the scanning
A biaxial movable mirror , wherein a reflecting mirror is provided on an upper part,
Pot-shaped mirror plate made of conductive metal, and a pot-shaped mirror plate provided on the back side of the reflecting mirror of the mirror plate
Needle-shaped pivot in the center, with concave bottom mounted
Mirror base, and the mirror base on the mirror base so as to face the mirror plate.
Insulated from mirror base and orthogonal to each other
A first and a second electrode pair arranged so as to perform the operation, a permanent magnet arranged below the mirror base, and a magnetic pole arranged so as to surround the entire mirror base.
And a display device. 2. A main body portion and, disk to be stored folded on the main body when not in use
A lean and an optical scanning mechanism stored in the main body when not in use.
Wherein the optical scanning mechanism is projected onto the screen
A linear light source that produces a thin light beam, and a thin light source from the linear light source that is projected onto the screen.
A two-axis movable mirror for deflecting a light beam, wherein the main body is configured to project the straight line projected on the screen.
Light spot of narrow light beam from light source is scanned at constant speed
Means for controlling the deflection of the two-axis movable mirror and means for displaying an image by blinking a light source in synchronization with the scanning
A portable display device comprising: a biaxial movable mirror , wherein a reflecting mirror is provided on an upper part,
Pot-shaped mirror plate made of conductive metal, and a pot-shaped mirror plate provided on the back side of the reflecting mirror of the mirror plate
Needle-shaped pivot in the center, with concave bottom mounted
Mirror base, and the mirror base on the mirror base so as to face the mirror plate.
Insulated from mirror base and orthogonal to each other
A first and a second electrode pair arranged so as to perform the operation, a permanent magnet arranged below the mirror base, and a magnetic pole arranged so as to surround the entire mirror base.
And a display device. 3. A display portable display device according to claim 2
A portable electronic device provided as a unit.