JPH0820854B2 - Small display device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a small display device suitable for a computer and various electronic devices, and particularly when observing this display and operating other work. The present invention relates to a small-sized display device suitable for, capable of displaying a large amount of information.

<Prior art> Display devices such as small computers and various small electronic devices
Generally, a CRT, a liquid crystal display device, an EL device and the like are provided, and most information can be displayed to an operator or the like.

<Problems to be Solved by the Invention> Although display devices such as CRTs, liquid crystals, and ELs provided in the above-described conventional devices can display a large amount of information, the display devices are large and lack portability. For example, when performing various other operations at the same time while monitoring the display device, there is a demand for a small-sized display device that can function as a part of itself, instead of being set in a fixed position. Such a small indicator is, for example, a pilot or a controller who operates a flight, an operator who works at a high place such as a tower or a bridge in relation to the construction in accordance with instructions from the ground, and a dark place such as a ceiling or an underground of a house. Is a case where a worker or the like who carries out various wiring work while looking at the display device carries and uses it.

However, the above-mentioned display devices such as CRT, liquid crystal, EL, etc. in the equipment are capable of displaying various data and messages, but the devices are large, and a good screen must be installed unless they are placed at least 30 cm or more from the eyes. I couldn't see it.

The present invention has been made in view of such problems,
It is a small-sized display device capable of displaying almost the same amount of information as a CRT and is suitable for the above-mentioned functions, and particularly provides such a small-sized display device having background light generation means. .

<Means for Solving Problems> A small-sized display device of the present invention includes a light source in which a plurality of light emitting elements are arranged in one dimension, and a lens arranged at a position where the light emitting elements in the one dimension are focused. And a vibrating mirror for obtaining a two-dimensional image from the light source, and a means for driving and controlling a light emitting element of the light source in synchronization with the vibration of the vibrating mirror based on display data. The background light generating means for obtaining the background light of the two-dimensional image is provided on the light source side, and the light of the two-dimensional image extracted as parallel light by the lens and the background light are directly viewed.

<Operation> In the present invention, a plurality of one-dimensionally arranged light emitting elements are used as a light source to drive a vibrating mirror at high speed to obtain a two-dimensional image of the light source, that is, a CRT is used in the vibrating mirror. While performing an operation equivalent to vertical deflection of display, while the mirror of the light source drive circuit scans for one cycle, a signal equivalent to a horizontal scanning line is generated based on message data to blink the light source. It is driven and also generates and adjusts background light, whereby a small-sized display can be obtained in which information is displayed with two-dimensional large-capacity background light from a one-dimensionally arranged light source.

<Example> A detailed description will be given below with reference to the drawings.

FIG. 1 is a diagram showing the principle configuration of a small-sized display as an embodiment of the present invention.

In the figure, 11 is an LED array as a light source, for example, 3
It is a one-dimensional high-density monolithic array of about 2 dots / mm, and although only one element is shown in FIG. 1,
The LEDs are arranged in series in the direction perpendicular to the plane of the drawing, and the total number of LED elements is about 280 dots when the length of the LED array is about 8.4 mm, for example. Further, in order to realize high density, the LED elements may be arranged in two rows in a staggered pattern. 19 is an LE that drives each LED of the LED array 11 independently.
It is a D drive circuit. Further, when the LED arrays are arranged in two rows in a staggered pattern, it is necessary to delay the lighting timing of one row and perform the operation as an example. As another method, a rod-shaped lens having a focusing function only in one dimension can be used, and the staggered electrodes can be used as one line array.

Reference numeral 12 is a vibrating mirror (galvano mirror) arranged to face the light source in order to obtain a two-dimensional image of the light source, and is in the arrow direction 12 → 12 ′ → ... → 12 ′ → 12 → 12 ″ →… → 12 ″ → 12 → 12 ′
→ ... Mirror drive circuit 21, mirror drive coil 2
Driven by 2. By driving the vibrating mirror 12, 16 → 16 ′ → ... → 16 ′ → 16 → 16 ″ → ... → 16 ″ → 16 → 16 ′
→ ... and the image of LED array 11 moves, and L is arranged in one dimension
A two-dimensional image is obtained from the ED array 11.

Let's focus on one element of the LED array. This element moves while emitting light equivalently by the vibration of the mirror to form one pixel.

That is, in FIG. 12, an arrow is drawn at the position of one light emitting element of the LED array at a certain time in the rectangular regions A1, B1, C1, D1.
It shall move in the direction of (v). Then, during the time tp for making one pixel (which will be referred to as one pixel time), l
It is assumed that it has moved to the regions A2, B2, C2, D2 while emitting light only. By this operation, it is visible to the observer's eyes as pixels of A1, B2, C1, D2.

The second pixel is A2, B2, C2, D2 light emitting element
Made by going to 3, B3, C3, D3. Therefore,
The pixel in this case is created by A2, B3, C2, D3. Similarly, the third pixel is created by A3, B4, C3, D4.

In this way, A1, B2, C1, D2, A2, B3, C2, D3, A3, B4,
Three pixels of C3 and D4 are lined up, but if the first pixel emits light, the second pixel does not emit light, and the third pixel emits light, the second pixel does not emit light. It is surrounded by the 2nd and 3rd emission, and what should be displayed as bright spot-non-bright spot-bright spot continuously shines. This is the width A of the LED
It is clear that this is because 1-B1, (or C1-D1) is too large compared to the distance 1 moved during one pixel time tp.

Therefore, it is necessary to make the size of one element of the LED array elongated. In this case, it goes without saying that the longitudinal direction is aligned with the length direction of the LED array.

Ideally, the width AB is O, but it is not preferable in terms of luminous efficiency. It has been experimentally confirmed that AB≈l is preferable. AB is the width of the LED light emitting part.

When the mirror vibration is sinusoidal vibration as shown in Fig. 3, the speed is low in the part where the deflection angle is large, so tp should be increased to equalize the pixel intervals and correct the linearity. There is a need to. However, simply increasing tp results in a brighter screen in the peripheral area than in the central area.

In order to compensate for this, the lighting time must be constant even if tp is increased. Further, as another means, it has been found that it is effective to use a means such as placing a correction filter on the optical path so as to obtain a uniform light amount.

Reference numerals 13 and 14 denote optical means such as lenses for enlarging and displaying the two-dimensional image obtained by the mirror 12. Reference numeral 15 indicates an observation position of the display device.

18 is a control circuit for controlling the entire device, 17 is a storage circuit for storing information to be displayed on the display device, and 20 is a control circuit
Message storage circuit 17 based on the timing signal from 18
Is a display control circuit that outputs the mirror drive signal and the LED drive signal to the mirror drive circuit 21 and the LED drive circuit 19 respectively in synchronization with the driving of the vibrating mirror 12 from the message information from
Details will be described later. The LED drive circuit 19 drives the LED arrays 11 independently by a drive signal synchronized with the vibrating mirror 12.

Further, the mirror drive circuit 21 drives the mirror drive coil 22 based on the mirror drive signal to drive the vibrating mirror 12. Reference numeral 22 'is a mirror position detector for detecting the position of the vibrating mirror 12, and this detection signal is introduced to the display control circuit 20.

In the figure, 80 is a background light LED and 81 is a non-scene light driving circuit, which will be described later.

Here, the display control operation, which is a drive system for the LED array 11 and the vibrating mirror 12, will be described in more detail. Vibrating mirror
12 is equivalent to vertical deflection of CRT display, for example, it is necessary for the observer to see it as one image due to the afterimage effect.
20-60 vibrations per second are required. The vibration of the mirror is performed by a current flowing through the mirror drive coil 22 by the mirror vibration circuit 21. The vibration angle θ of the mirror may be a sine wave vibration as shown in FIG. 3, but a sawtooth wave vibration as shown in FIG. 4 is more preferable as far as the distortion is concerned. The reason is that the resulting image is distorted.

The mirror position detector 22 'detects by electromagnetic or optical means and sends a synchronizing signal to the mirror vibration drive circuit of the display control circuit 20, and the display control circuit 20 sends a signal to the LED drive circuit 19 based on the signal. Is supplied to cause the LED array 11 to emit light. The detection signal corresponds to the vertical synchronizing signal of CRT display. When the mirror is vibrated with a non-sinusoidal wave as shown in Fig. 4, the waveform is detected from this signal and the mirror is driven to operate with the correct waveform. The waveform of the circuit 21 may be corrected.

On the other hand, the LED drive circuit 19 corresponds to a horizontal or line display in a CRT or a duty type liquid crystal display, and corresponds to several hundred scanning lines while the vibrating mirror 12 scans for one period. The signals are sequentially emitted. The light emission is performed according to the image signal to be displayed.

Further, the display content stored in the storage circuit 17 for storing a message is specifically converted into an image signal by a character generator, and applied as a sequential light emission signal of the LED array 11 from the display control circuit 20 to the LED drive circuit 19. It

In this, a signal for one screen is sent during one cycle of the vibrating mirror 12, and the display for one screen is performed.

FIG. 5 and FIG. 6 respectively show horizontal structural sectional views of the small-sized display.
The LED array 32 is arranged.

A vibrating mirror 33 called a resonance type scanner vibrates the mirror 34 at high speed. When the LED array 32 blinks in response to the data signal in synchronization with the vibration of the mirror 34, a plane image is displayed on the mirror 34 as a virtual image.

Reference numeral 35 is a lens, and the relationship between the lens 35 and the LED array 32 is such that the LED array 32 is installed at the focal point of the lens 35 so that the light reaches the eyes 36 of the observer as parallel light. The parallel light is equivalent to that the observer is at infinity, and the image can be viewed by the eyes regardless of the distance from the housing 31. Therefore, it is possible to observe the display image very naturally even if the display image is brought close to the extent that the eye comes into contact with the housing 31. 43
Is a protective plate that is made of a plastic or glass filter plate that allows the emission color of the LED to pass through.

The size of the image is magnified by the lens 35, and if the focal length of the lens is fmm as described above, it is given by m = 250 / f, so a lens of f = 25mm can be observed as a 10 × magnified image, The size of the body 31 can be made as small as a lighter.

In FIG. 5, reference numerals 71, 72 and 73 denote integrated electronic circuits described later, and 74 is a flexible printed circuit board, 7
5 indicates a flexible electrode.

This display is not only capable of displaying a large amount of data in spite of its small size, but it can also be placed at a position where it almost comes into contact with the eyes to observe the displayed contents.

As described above, the display device includes the LED array 32,
Characters, graphics, etc. can be displayed by the mirror 34, but when the displayed contents are observed from the position 36 with the structure shown in FIGS. 5 and 6, the light from the outside is surrounded by the enclosure of the device. Therefore, characters, graphics, etc. are clearly displayed in the dark part.

This is the same outdoors even when exposed to direct sunlight, and there is a feature that a clear image can be obtained even under direct sunlight.

However, when the display device is used, the display device is placed in one eye, and the observer often operates it with his or her hand or finger while looking at a different object such as a keyboard or a measuring instrument with the other eye. .

In such a case, the display device displays red letters in the dark area with no background light, and only one eye is placed in the background light such as the keyboard and the meter for the measuring instrument. Very tired.

As a result of the experiment, it was found that even in the display device, it is less tired for the eyes to keep the brightness at a certain level even if the contrast is lowered than to make the surroundings of the displayed characters dark.

 Various methods are conceivable as a realization means.

One of them is to illuminate the side surface or the periphery of the light emitting portion of the LED array with a light source. As a light source to irradiate,
Part of the light emitted from the LED array 32 may be used, or an LED or a tungsten lamp may be provided separately. Further, a window may be provided in a part of the outer enclosure so that external light can enter and the size of the window can be adjusted.

Furthermore, the light from the window may be guided to the vicinity of the LED array by using a light guide such as an optical fiber or a mirror. In this case, the position of the window for taking in light is preferably on the side opposite to the viewing window. This is because it is proportional to the amount of light in the direction in which the other eyes not observing the display are facing.

When the area around the LED array is simply illuminated, the reflectance of the light is poor, and locally reflected light from the wire bonding that connects the LED arrays, etc. enters and is scanned by the mirror 34. Often unfavorable as it will enter the background. In that case, it is better to leave the elongated light emitting part of the LED array and to surround the other part with a thin plate having a certain reflectance. Also, the back light becomes softer when this plate is slightly off from the focus of the lens.
Therefore, it is preferable to place the plate closer to the lens than the LED array 32, which is the focal position of the lens. In order to obtain uniform brightness on the entire surface, it is preferable that the background light is scanned by the mirror 34 and then enters the observer's eyes. The plate may have an elongated slit shape.

As another means, the illumination light can be transmitted directly or through a scattering plate,
It is intended to be seen by the observer. The position of the light source, the position of the scattering plate, etc. are the same as when using reflected light,
It may be at any position as long as it is a position where it is emitted from the LED array and does not interfere with the display, and it enters the eyes of the observer through the mirror 34. LEDs almost the same length as the LED array
Light sources such as may be placed side by side with the LED array.

The brightness of the background can be changed according to the place to observe and the taste of the observer.

Also, the color of the back light may be the same red as the LED array,
Other white or green may be used. Also, it is possible to prepare several kinds of light sources and use a filter to obtain a desired color.

Further, when the mirror vibrates in a sine wave, the peripheral part becomes brighter than the central part, so that the brightness and lighting timing of the light source may be changed to make uniform light.

FIG. 14 shows an example of the configuration of the background light generating section using LEDs. L
The square LED 80 having the scattering surface 80a is arranged on both sides of the ED array 32, and the amount of background light is obtained by driving the driving terminal 80b of the background light LED 80 by the background light driving circuit 81 shown in FIG. be able to. The amount of background light can be changed according to the amount of display data by controlling the current to the LED 80. Note that 82 is a protective glass, 83 and 38 are driver ICs, and 84 is a ceramic substrate.

The small display 31 described above is specifically configured as shown in FIGS.

In FIG. 7, the above-mentioned small display 31 is rotatably attached to a glasses-type frame 37. That is, at the position of the lens of the glasses of the frame 37, the display surface is opposed to the eyes of the observer and the frame 37 is rotatably supported by the rotation support member 38 in the vertical direction.

Therefore, the small display 31 is rotated between the observation position A which is in front of the observer and the non-observation position B which rotates upward from the observation position A and does not obstruct the visual field of the observer.

Reference numeral 39 is a lead wire for operating the display unit, one end of which is connected to the display unit 31 and the other end is connected to a host unit 40 which is fixedly held by a part of the frame 37 and further stored and held in a chest pocket of the observer's clothes. To be done.

Since the display unit 31 is used like glasses, the display unit 31 needs to be as light as possible even if the weight of the host unit 40 becomes a little heavy. Power is supplied to the device 31 via a lead wire.

Therefore, the observer puts on the frame 37 to which the small-sized display 31 is attached and performs the work like wearing glasses. For example, a pilot, such as a pilot, puts the above-mentioned frame, sets the display device 31 at the non-observation position B, and operates it, and when he / she sees any instruction or various data, observes the display device 31 in the operated state. Set it to position A and check the data on the display 31.

In this way, it is possible to perform work while checking a large amount of information on the display 31 while using both hands and also moving the head. Further, when the display device 31 is not needed, it is rotated to the non-observation position so that it does not interfere with the visual field.

FIG. 8 shows that the small display 31 does not rotate up and down,
This is an embodiment in which it can be rotated to the left and right, and the rotation support member 38 moves laterally between the observation position and the non-observation position on its side.

FIG. 9 and FIG. 10 show a frame 37 having a headphone type head shape, and the small display 31 is attached to the second frame 42 and the other end of the second frame 42 is attached. Is attached to the frame 37 via a rotation support member 38. Therefore, the small display 31 can be rotated and moved laterally with the position of the rotation support member 38 as a fulcrum to move to the observation position A and the non-observation position B. Further, the lead wire 39 is held by clothes with a clip 44 so as not to interfere with the work, and the other end is connected to the host section placed in another place.

The position can be switched between the observation position A and the non-observation position B with one touch, and the observation position A can be installed at a position where the observer can easily see it by a simple adjustment function. Therefore, the observer adjusts the position and the direction at the observation position A so that the observer can see the image most easily after fixing the glasses or the headphone to the head as shown in the figure. Once adjusted, even if you switch to the A position and B position with one touch after that, you can always fix it at the most visible position adjusted before. Therefore, even if you have a tool in your hand or wear protective gloves and you cannot make fine adjustments with your fingertips, you can easily attach it to the most observable position at observation position A if you adjust it first.

Furthermore, although not shown in the figure, a fixed microphone that extends from the head and head fixing portion to the mouth with an arm is used in combination, and if a method that is used in combination with voice is used, the microphone is inserted through the microphone. It is also possible to request the interlocutor to switch between A and B, and perform the switching by remote control of the interlocutor.

In addition, the light source in this display uses LEDs, but it is important to keep the LEDs lit continuously for power consumption, LED
Is no better than life. Therefore, non-observation position B
Since the display is unnecessary in the above, it is useful to provide a display only at the position A, and at B, all or at least the LED / array of the display device 31 is turned off.

The means to turn off the LED array when not in use is shown in Figs.
In the case of Fig. 10, it can be realized by the above-mentioned means.
You can hold 31 by hand, bring it to your eyes, and install a switch like a camera shutter on the top of the display so that you can see it when you press it.

On the other hand, an observer's eye has a dominant eye like a hand, and there are a right eye dominant person and a left eye dominant person. In this case, when the horizontal scanning is performed with a mirror and the LED side of this device is installed in front of the eyes so that it does not hit the nose, the display will be reversed for right-handed and left-handed, so for both, the LED You must switch the signal transfer direction of.

Therefore, a shutter-like LED and an ON / OFF switch may be provided on the upper surface and the lower surface of the switch so as to switch between left and right.

FIG. 11 shows the circuit block of the embodiment of FIG.
1,52,53,54 are circuits for blinking the LED array 32 according to the video signals sent from the data store 50, which are drivers, latches, shift registers, and LED control circuits.
A hybrid IC is formed on a ceramic plate or a metal plate whose surface is insulated together with the D array 32.

The data (code data) formed by the host unit 40 is converted into an image signal by the character generator (CG) 55, and further stored in the data store 50 which is the refresh memory of the display. The display signal is not limited to the character signal and includes graphic information formed by the host unit. The data store 50 is read by the clock pulse generated by the clock pulse generator 56, and the LED control circuit 5 is read.
Sent to 4, shift register 53, latch 52, driver 5
Drive the LED array 32 via 1.

In this case, the transfer rate of the clock pulse and the display signal is very high, and is 20 Mbit / sec or more. It is difficult to send a signal of such a fast frequency to the display unit and the host unit with a wire that extends for 1 m, for example, and it is difficult to send the signal stably. Therefore, the data store 50, the clock pulse generation unit 5
6 is provided on the display side. Further, if the signal sent from the character generator 55 to the data store 50 is also sent at high speed, it is preferable that the character generator 55 is also provided on the display side, but in order to reduce the weight of the display,
Provided on the host side.

Therefore, it is useful that the transfer speed from the CG 55 to the data store 50 is reduced by about one digit from the transfer speed of the data store 50 and the LED control circuit 54 before sending. Therefore, the clock pulse generator 57 is provided in association with the CG 55.

In this way, the data store 50 has different input / output speeds, and as a result, the CG55
The signal from can not be read, or conversely CG55
It does not make sense that the display disappears during transfer to 50. Therefore, the data store 50 is configured by a 2-port RAM having 2 ports. As a result, data store 50 and CG55
Can be placed on the host side. At this time, when sending a signal from the CG 55 to the data store 50, it is necessary to send a start signal from the host unit 40 to the data store 50, but even if no signal line is provided between the two, the clock is stopped for a few pulses,
The time of re-occurrence should be the start.

There are various other methods for transmitting the start signal over the other signals, but the description thereof will be omitted.

Here, as an example, the clock generators 57 and 56 are not provided separately, but they can be shared. The clock pulse generated at 57 is used to send the image signal serially from the host side to the display side. Meanwhile, from data store 50
The information sent to the LED control may be converted by parallel converting some bits of information. For example, if the transfer from 50 to 54 is performed in byte units, the clock generators 56 and 57 can be shared. The information transmission rate is 8 in this case.
Is doubled.

For example, when the transfer of the display signal from the data store 50 to the LED controller 54 is 20 Mbit / sec, the byte transfer will be 2.5 Mbyte / sec, and L1 can be transferred at 2.5 Mbit / sec.

Image signals generated on the host side including CG55 and CLOL57 are
It is not always dedicated to this indicator. CR in most cases
It is shared with the one displayed on T.

In this case, for example, if a CRT is used to display 200 pixels × 640 pixels, the number of scanning lines is 200 and the number of pixels in the horizontal scanning line direction is 640. That is, the image signal is (6
It is sequentially sent in the direction of 40 pixels), but when this kind of display is performed on this display, information is sent to the 200 LED arrays lined up in the vertical direction, the LED array is lit and moved horizontally, and the screen is moved. Will be formed.

In this case, the image signals are sequentially sent in the vertical direction. That is, when displaying a screen as shown in FIG. 13, if it is a CRT, it moves down one line while scanning sequentially in the direction of the horizontal arrow, but in this method, while displaying the direction of the vertical arrow, the next Will scan the columns. That is, the main scanning and the sub scanning are reversed.

Therefore, when an image signal generated by a CRT-displayable host (including CG and CLOL) is used to display the image on this display, the image is rotated by 90 °. In this case, if the number of vertical pixels and the pixel shape ratio are the same, it is preferable, but if they are different, such as 200 × 640 pixels, accurate display cannot be performed.

Therefore, it is necessary to develop new dedicated software suitable for this display. However, it is not good because the development cost of software becomes large. CRT as much as possible
I want to use the large amount of software developed for display as is.

When this type of display device is used to achieve this, a scanning direction conversion unit is provided so that the CRT software can be used as it is. For this, a data store memory may be provided on the host side to change the reading direction. or
It may be converted when a signal is sent to the data store 50 through L1.

Furthermore, as another method, it is effective to use a RAM (for example, MPD42232) called a triple port graphic buffer as the page memory of the host unit. By using this, it is possible to read not only the image information of the same screen from the column direction but also from the column direction.

Therefore, by using this type of memory as the image memory, the output read from the column direction is used for the CRT display, and if the column direction output is used for this display, one memory can display different scanning directions. Can operate the vessel.

As mentioned in the previous section, some observers have right-handed eyes and others have left-handed eyes. Right-handed and left-handed people have to rotate the displayed image 180 °. There are several possible ways to achieve this, one of which is to change the display timing in FIG.

In Fig. 3, the thick line part where the amplitude of the mirror rises is used as shown in the figure, but the falling part is used and the video signal transfer direction to the LED array is used. Is the opposite. That is, in the case of a right-handed person, the image is sent from the upper side of the array, but is reversed from the lower side.

In another embodiment, the transfer order of video signals sent from the data store 50, which is a video memory, to the LED control is reversed. This can be achieved by reversing the read address from the memory.

On the other hand, another important point of this display device is the display 31
And the number of wires (lead wires) connecting the host unit 40 and the host unit 40.

This wire needs to be as light and flexible as the wire in a headphone stereo earphone.
Therefore, it is preferable to provide the driver circuit 58 for driving the resonance type scanner on the display side. Because the driver circuit 58 operates by feeding back the output from the position detection coil 59 of the mirror 34, the mirror 34 is operated by the current flowing from the driver circuit 58 to the driver coil 60, and the position signal is transmitted through the line L5 to the timing. Since it is sent to the control circuit 61 and the clock generator 56 and the data store 50 are operated by the control circuit 61, providing the driver circuit 58 in the host unit 40 is effective for reducing the weight on the display side, but displaying Device 37 and host unit 40
The number of wires that connect to each other increases all at once. Therefore, it is effective to provide the data store 50 and the driver circuit 51 on the display side from the viewpoint of the entire system.

Since many of the electronic circuits in the display 31 are integrated into an ASIC, it is preferable to provide the timing control circuit 61 on the display side.

The electronic circuits in the display are integrated into a memory, which is a data store, and a few ASICs. However, this device is characterized by miniaturization, and combining these electronic components in one place enlarges the device itself. For miniaturization, it is effective to disperse these electronic components. For example, in FIG. 5, the LED driver hybridized with the driver circuit is installed on the bottom surface as shown in the figure, but the other integrated electronic circuits 71, 72, 73 are placed at the positions as shown in the figure. I like to place it. This not only makes effective use of the installation space, but also has the effect of dispersing heat.

Since the LED arrays 71 and 72 are arranged perpendicular to the paper surface, this surface parallel to the LED array is out of the optical path, so that installation on this surface is effective.

That is, the light emitted from the LED array 32 and effectively used via the lens 35 is limited to that included in the wedge-shaped solid angle formed by the lens 35 and the LED array 32 arranged in the direction perpendicular to the paper surface. Light that goes out of it is not used. Therefore, the portions 71 and 72, which are in the width direction of the wedge, are regions that do not interfere with the optical path.
It doesn't matter if electronic parts are placed.

When two or more compound lenses are used as the lens 35, other lenses may be installed in the vicinity of 71 and 72, but even in that case, the optical path of effective light is wedge-shaped. Therefore, in this case, even if the lens near the LED is an axially symmetric lens, its shape does not have to be circular, and it is an elongated shape obtained by cutting the wedge width direction, that is, 71 and 72 in FIG. You can install electronic parts in this part because the lens of is good.

73 is an integrated circuit that drives the mirror 34. Of course, the integration degree of 71 or 72 may be increased and included in these. 75 is a signal and power line for connecting to the host unit.

In this way, the electronic circuits 32, 71, 72, 73 are distributed over many sides of the display device 31, and each electronic circuit has a high degree of integration and a large number of terminals. Therefore, it is necessary to mount them all on the printed circuit board.

However, in a normal hard substrate, the connection between the substrates becomes a problem. For the purpose of excluding such arrow points, it is effective to construct this device on one flexible printed board. Figure 74
Is one flexible board, 32,71,72,73 are all
It is configured on this one flexible printed board. In addition, 75 also has a flexible printed electrode in the shape of a ribbon and used as a connection line to the outside. Since the printed electrode can pass about 5 signal lines per mm, the signal line (electrode) is extremely light and has high flexibility. This may be a single layer, but it may be a multi-layered structure in which the signal line and the power line (electrode) are separated, the power line (electrode) including the ground electrode also serves as the shield electrode, and the signal line is sandwiched.

As is clear from the above description, by providing the character generator or graphic information generator 55, low-speed clock generator 57, power supply 41 in the host unit 40,
The number of signal lines of the display unit 31, the host unit 40, and the wire group connecting them is small, and a balanced system can be configured. Although the wire group is composed of several wires, they are covered with one flexible thin wire while being insulated from each other.

As a means for further reducing the number of wires, the CG 55 to be transferred to the data store 50 and the low-speed clock generator 57 are not transferred through the separate lines of the lines L1 and L2, but transferred by only one. The image signal sent from the character generator 55 to the data store is sent as a binary signal in synchronization with the low speed clock generator 57. Moreover, since the transfer rate during this period is low, the output of the clock generator 57 can be easily multiplexed by changing the amplitude, phase, etc. according to 1, 0 of the image signal, and transmitted by one line. Can be done. This can be realized by placing the data store 50 on the display side, the character generator 55 and the clock generator 57 on the host side, and transferring at a low speed between them.

Furthermore, the lines L1 and L2 can be sent on the power line L3. Since the power is direct current and the clock pulse and the image signal are high-frequency components, they can be separated very easily in the display unit even if they are transferred in layers.

 To summarize the above-mentioned embodiments, 1) a power source is provided in the host unit 40.

2) The data store 50 is provided on the display 31 side.

3) Character generator 55 and clock generation circuit
57 is configured on the host side and is transferred as an image signal to the display device.

4) The image transfer speed from the host unit to the display is lower than the transfer speed in the display.

5) Use 2-port RAM for the memory of the data store 50.

6) The image transfer from the host unit to the display unit and the transfer clock are sent on the same line.

7) Transfer the image signal or the clock signal from the host unit to the display and both of them via the power line L3.

8) The wire between the host unit and the display is connected by one flexible covered wire.

9) The light emitting part of the LED array is elongated in the array direction.

10) The display device is provided with a display ON-OFF switching means, and the LED array emits light only during observation.

11) Provide a switch on the display for left-handed and right-handed eyes.

12) A horizontal-vertical conversion unit for the CRT display image generated in the host is provided, and the CRT display image information is displayed on this display device as it is.

13) The electronic circuit provided in the display device is composed of a flexible substrate, and the electronic circuit is placed on at least two or more inner walls.

Although the above embodiments describe the case where the refresh memory is placed on the display unit, the present invention is not limited to this.

When this display device is used by the method shown in FIG. 7 to FIG. 10, it is necessary to make the signal line group with the host unit thin, which increases the weight and power consumption of the display unit 31. However, it doesn't make sense to grow up.

One embodiment for avoiding this is to place most of the electronic circuits such as the data store 50 and CLOH 50 shown in FIG. 11 in the host section. In this case, since the amount of data transferred from the data string 50 to the shift register 53 formed as a hybrid IC with the LED array is large, this single transfer is carried out not on a bit basis but on a multi-signal line, for example on a byte basis.

However, between the display unit 31 and the host unit 31, it is necessary to transfer not only the image signal but also the vibrating mirror, other control signals, and power.

A method of sending these signals in a time-division manner is also effective as one means for sending a large number of signals through a limited number of signal lines.

For example, in FIG. 3, the image is actually displayed and the image signal is sent from the data store to the LED array, because only the part drawn in bold in the figure is empty and the other parts are empty.
It may be used for transferring other signals during this period. Of course, during this period, power can be sent to charge the condenser, etc., and can be used for mirror and mirror position detection and LED lighting.

Further, in this method, the number of lead wires is increased, so that the copper wire coated with an ordinary insulator is thick.

Therefore, it is preferable to use electrodes formed by a printing technique on the surface of the thin polyimide film. 5m by this means
It is possible to form more than 15 electrodes on an m-width ribbon, and it is very easy to bend.

Further, the use of the small-sized display device configured as described above is considered as follows.

[Pager]

A device that can be easily brought into a place where a large number of people gather, and can obtain "information only for you" and "information that you do not want to know""anytime""anywhere" by taking advantage of its small size and limited viewing position Can be applied to.

[FA / construction site]

In a space where people can barely enter, such as the ceiling, underfloor, manhole, etc., I want to connect, inspect, etc., while watching the large capacity display.
There are applications where the installation location cannot be secured. Another building,
Application to work sites where operations and tests are performed while exchanging procedures and data under direct sunlight such as in steel towers.

[Education / Research]

Application to a device for comparing and correcting VIEM SCOPE with one eye and a photograph / illustration on a desk with one eye, and superimposing images, like microscopic observation.

[Other]

Since it is small, it can be applied to portable databases, portable handheld computers, portable word processors, etc.

<Effect> As described above, according to the small-sized display device of the present invention, a large amount of information can be displayed, the display device main body can be brought close to the eye, and background light can be generated and adjusted. You can get a display image that is not tiring to your eyes.

[Brief description of drawings]

FIG. 1 is a block diagram showing the display principle of a small display device according to the present invention, FIG. 2 is a diagram showing the optical system of the same device, FIG. 3 is a diagram showing the vibration angle of a mirror, and FIG. Diagram showing vibration angle,
5 and 6 are sectional views of a small-sized display which is a specific configuration of the display device of FIG. 1, and FIGS.
FIG. 11 is a diagram showing an embodiment of the present invention using the compact display shown in FIG. 6, FIG. 11 is a block diagram showing the circuit configuration of the compact display of FIG. 5, and FIG. 12 is a display LED. FIG. 13 is an explanatory diagram showing that overlapping occurs, FIG. 13 is a diagram showing the scanning direction of the display screen, and FIG. 14 is a diagram showing an example of background light generation. 11: LED array, 13, 14: Lens, 19: LED drive circuit, 21: Mirror drive circuit, 31: Display housing, 32: LED array, 33: Resonant scanner, 34: Mirror, 35: Lens, 37 : Frame, 3
8: Rotation instruction member, 39: Lead wire, 40: Host part, 41: Power supply, 50: Data store, 55: Character generator, 8
0: LED for background light, 81: Background light drive circuit.

Claims (1)

[Claims] 1. A light source in which a plurality of light emitting elements are arranged in one dimension, a lens arranged in a position where the light emitting elements in one dimension are focused, and a vibration for obtaining a two-dimensional image from the light source. A small display device comprising a mirror and means for controlling drive of a light emitting element of the light source in synchronization with vibration of the vibrating mirror based on display data, wherein background light for obtaining background light of the two-dimensional image. A small-sized display device comprising a generating means on the side of the light source and directly looking at the light of the two-dimensional image extracted as parallel light by the lens and the background light.