JP2000112395A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably obtain a distinct picture by automatically adjusting the display position of the picture to the focus of observer's eye. SOLUTION: A light emitting pattern equivalent to one column of picture data is successively generated by an LED array 8 in a picture generating part 6. A virtual image generated by making each light emitting pattern pass through a lens 9 is scanned by a vibration mirror part 10 and the image of a two-dimensional picture is provided to a user's eye 11. Meanwhile, a 2nd light source 19 is arranged at a position adjacent to the LED array 8, and a photodetector part 20 for receiving reflected light from the eye 11 for the light made incident on the eye from the light source 19 through the lens 9 and the mirror pat 10 is provided between the mirror part 10 and an observation window 4. A lens position adjusting mechanism 17 for displacing the position in the optical axis direction thereof is attached to the lens 9 and the incident state of the reflected light at the photodetector part 20 is inputted in a driving circuit of the mechanism 17 to adjust the position of the lens 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for displaying various data as a two-dimensional image, and more particularly to a display device for displaying an image based on a virtual image of a light emitting pattern using a lens. .

[0002]

2. Description of the Related Art As a display device of this type, there is a portable display device disclosed in Japanese Patent No. 2725788. In this device, an observation window for observing an image is formed at a predetermined position of the device, and an optical system including an LED array, a lens for magnification, a mirror that vibrates at high speed, and the like are arranged inside the device. Become.

[0003] An LED array is composed of a large number of LEDs for generating a light emission pattern for one row of an image to be displayed.
And a light emission pattern for one image is sequentially generated for each column in synchronization with the oscillation cycle of the mirror. The light emission pattern passes through the lens to generate a virtual image of the light emission pattern, which is projected from the lens toward the mirror. The virtual image every hour is scanned in the horizontal direction with respect to the observation window by the vibration of the mirror. Since the vibration of the mirror and the light emitting operation of the LED are performed at a high speed, a two-dimensional image is presented to the user's eyes due to the afterimage phenomenon.

[0004]

The apparatus having the above-described structure is formed in a size and weight that can be supported by both hands or one hand, and is usually in a state where the user himself / herself supports the apparatus and places his / her eyes on the observation window. Used in. However, the positional relationship between the observation window and the eye varies depending on the person, and conventionally, in order to recognize a clear image, the user has to rely on the focusing mechanism of the user's own eye.

[0005] Further, since the apparatus main body is supported by hand,
In an unstable state, the position of the device moves delicately, and the image blurs every time the positional relationship between the optical system and the eye changes,
It is difficult to confirm the display contents in a stable state. In addition, when the sharpness of the image becomes unstable, the user frequently operates the focus adjusting mechanism of the eye, so that the user tends to be tired and cannot endure long-time use.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and detects an amount of eye shift with respect to a position where the focus of an observer's eye matches a displayed image, and generates an image generation image in accordance with the amount of shift. By adjusting the position of the lens, the display position of the image is automatically adjusted to the focus of the observer's eye without relying on the focus adjustment mechanism of the observer's eye, and a clear image is stably provided. This is a technical issue.

[0007]

According to the first aspect of the present invention, there is provided a light emitting pattern generating means for generating a light emitting pattern forming an image, a lens for passing the light emitting pattern to generate a virtual image thereof, In a display device having an observation window for observing an image by a virtual image, a position adjustment unit for adjusting the position of the lens in the optical axis direction, and the lens, with respect to the lens, is disposed on the light emission pattern generation unit side, A light emitting means for projecting light toward the observation window,
A light receiving unit that is arranged with a fixed positional relationship with respect to the observation window and the light emitting unit and receives light reflected from the observer's eye with respect to light from the light emitting unit, and a light receiving state of the reflected light in the light receiving unit. Detecting means for detecting a shift amount of the eye with respect to a position where the focus of the observer's eye matches the virtual image of the light emitting pattern; and the position adjusting means such that a lens is displaced in accordance with the detected shift amount of the eye. And control means for controlling the operation of (1).

According to the second aspect of the present invention, the light receiving means includes a plurality of light receiving elements arranged side by side in a direction crossing the optical path of the reflected light, and the detecting means includes a light reflecting element for each light receiving element. The apparatus is configured to detect the amount of displacement of the eye using the amount of incident light.

[0009]

The user recognizes the image by observing the virtual image obtained by the light emission pattern from the light source passing through the lens through the observation window, but the apparatus and the position of the user's head are changed. If the user's eyes are out of focus at the display position of the image, the user cannot recognize a clear image. On the other hand, the state of incidence of light from the light emitting means on the eye also varies according to changes in the position of the eye, but since this light emitting means is disposed on the same side of the lens as the light emitting pattern generating means, The state of incidence of light always changes in conjunction with the state of incidence of the light emission pattern on the eye.

The light receiving means receives reflected light from the user's eyes with respect to the light from the light emitting means. However, since the light receiving means is arranged with a fixed positional relationship with respect to the light emitting means and the observation window, Changes in the incident position and the amount of incident light of the reflected light in the light receiving unit are caused by the state of incidence of the light from the light emitting unit to the eye, in other words, the current displacement of the eye with respect to the position where the eye focuses on the virtual image of the light emitting pattern. Will be accurately reflected.

Thus, the amount of displacement of the eye with respect to a position at which a clear image can be recognized is detected by the detecting means using the state of light reception of the reflected light by the light receiving means. By performing the adjustment, the virtual image of the light emission pattern is automatically adjusted to the focal point of the eye at the current position of the observer's eye, and it is possible to recognize an image without a focusing shift.

According to the second aspect of the present invention, the incident position of the reflected light and its reflection are compared by comparing the incident amounts of the reflected light on a plurality of light receiving elements arranged in a direction intersecting the optical path of the reflected light to be received. It is possible to determine the size of the light image, and it is possible to detect how much the eye of the observer has deviated from the just-focused position based on the determination result.

[0013]

FIG. 1 shows the appearance of a portable device according to an embodiment of the present invention. This device has a size and weight that can be held by both hands or one hand, and includes an image display unit 2 and a circuit board (not shown) incorporated in a box-shaped main body 1. Also, in the main body 1,
An observation window 4 for visually recognizing an image displayed by the image display unit 2 is formed on the front surface, and an input key 5 is provided on the upper surface.

A control circuit 3 shown in FIG. 14 is formed on the circuit board. The control circuit 3 provides the image display unit 2 with a display screen realized by an application program being executed therein, or image data of an image transmitted from outside through a transmission cable or wireless communication (not shown). The input key 5 is used for, for example, an operation for confirming data displayed on the image.

The housing 7 constituting the outer shape of the image display section 2 is formed by integrally forming an opening 7b projecting forward on the front surface of a housing body 7a formed in a horizontally long box shape. The size of the outer periphery of the opening 7b corresponds to the size of the window frame of the observation window 4, and the housing 7
The housing main body 7a is disposed at a deep position in the main body 1 and the opening 7b is communicated with the observation window 4.

FIG. 2 shows a configuration of an optical system in the image display unit 2. In the figure, reference numeral 6 denotes an image generation unit, which includes an LED array 8, a lens 9, and a vibration mirror unit 10. The LED array 8 is provided on the side plate 27 on the side opposite to the opening 7b side in the housing body 7a.
Are arranged along the vertical direction (the y-axis direction orthogonal to the plane of FIG. 2). The lens 9 and the vibrating mirror unit 10
Aligns the optical axis with the arrangement position of the LED array 8,
They are arranged in order along the longitudinal direction of the housing body 7a (corresponding to the x-axis direction in the figure).

The LED array 8 has an LE corresponding to the number of pixels in the column direction (y-axis direction) of an image to be displayed.
The control circuit 3 sequentially receives luminance data for each column from the control circuit 3 to perform a light emission operation as described later. Each L
The illumination light from the ED 8a is substantially collimated and expanded via the lens 9, and then strikes the mirror surface of the vibrating mirror unit 10, passes through a beam splitter 21 described later, and is guided toward the observation window 4. As a result, the light image of the enlarged illumination pattern is reflected on the mirror surface, and can be captured by the user's eyes 11 observed through the observation window 4.

As shown in FIG. 3, the vibrating mirror section 10 is provided on a substrate 1 fixedly disposed at a predetermined position in a housing 7.
The mirror 14 is connected to one end of the second through a leaf spring 13 and is set so that the image of the light emission pattern at the time of non-vibration is located at the center of the image. A voice coil motor 15 is provided between the substrate 12 and the mirror 14 at an open end position. This voice coil motor 15
Vibrates the mirror 14 at a resonance frequency determined by the mass of the mirror 14 and the spring constant of the leaf spring 13. By this operation, a vibration axis parallel to the arrangement direction (the y-axis direction) of the LEDs 8a is set at a portion connected to the leaf spring 13, and the mirror 14 vibrates at a high speed within a predetermined angle range.

In this embodiment, the resonance frequency is set to 60 so that a user observing an image does not feel flicker.
Each of the above components is adjusted so as to be equal to or higher than HZ. Further, in this embodiment, the mirror 14 is controlled so as to vibrate in a sine wave so as to avoid a sudden displacement operation of the mirror 14.

The control circuit 3 controls the mirror 1 under the above conditions.
4 is vibrated at a high speed, and a light emission pattern for one screen by the LED array 8 is generated in synchronization with a one-way vibration cycle of the mirror 14. As a result, the virtual image of the light emission pattern every hour is scanned from the mirror surface of the mirror 14 toward the observation window 4.

FIG. 4 shows a scanning image of the light emission pattern viewed from the observation window 4. Each rectangle 16 in the figure corresponds to an enlarged light image of irradiation light from one LED 8a, that is, one pixel, and by the operation of the optical system described above,
A virtual image of the light emission pattern of each column is sequentially scanned in the forward and reverse directions along the x-axis direction with respect to the observation window 4. In the illustrated example, twelve pixels are shown at predetermined intervals in each column. However, actually, a pattern in which many pixels are densely arranged is presented.

Since the above-mentioned scanning is performed at a high speed, the user can observe the inside of the observation window 4 by the principle of the afterimage phenomenon.
It feels like a two-dimensional image is being projected. In the figure, the scanning direction from left to right of the light emission pattern is the forward direction, the scanning direction from right to left is the reverse direction, and the scanning in the forward direction is hereinafter referred to as “rightward scanning”, and the scanning in the reverse direction is referred to as “rightward scanning”. Left scan ".

Returning to FIG. 2, the image display unit 2 of this embodiment
Further includes a lens position adjustment mechanism 17 and a displacement detection mechanism 1
8 are incorporated. When these mechanisms are used to observe the two-dimensional image generated by the image generation unit 6, the user's eyes 1 in the observation direction (that is, the z-axis direction).
In a case where the position of the eye 1 is deviated from the position at which the image can be clearly captured, the lens system on the image generating unit 6 side is adjusted before the user's own focusing mechanism operates, and the current position of the eye 11 is adjusted. This is for automatically adjusting the image display position to the focus.

The lens position adjusting mechanism 17 includes movable coils 17A, 1 attached to both ends of the lens 9.
7B and its driving circuit 40 (shown in FIG. 14). The rotation of the movable coils 17A and 17B causes the lens 9 to rotate.
Moves back and forth in the optical axis direction.

On the other hand, the displacement detecting mechanism 18 includes a second light source 19 disposed near the LED array 8, a light receiving unit 20 disposed between the vibration mirror unit 10 and the observation window 4,
And a processing circuit for the output signal from the light receiving unit (including the differential amplifier circuit 31 shown in FIG. 10).

The light source 19 emits measurement light for detecting a shift of the user's eye 11 from a position at which an image is generated by the virtual image of the light emitting pattern. As shown in FIG. It comprises a pair of LEDs 19A and 19B arranged at adjacent positions. Note that these L
The EDs 19A and 19B are invisible to the human eye 900
It emits light in the infrared region of the order of nm with the emission intensity as small as possible, and is arranged symmetrically with respect to the horizontal plane PL including the optical axis of the lens 9.

The light from the LEDs 19A and 19B is also scanned on the mirror surface of the vibrating mirror unit 10 via the lens 9 similarly to the light from the LEDs 8a. Since the light emitting period is set to the light emitting period of the LED 8a because of the arrangement of the optical axes shifted from each other, as shown in FIG.
The scanning ranges 45A 'and 45B' of the reflected light images 45A and 45B of the measuring light from B correspond to the scanning range 4 of the light emitting pattern.
6 is scanned at a position deviated from 6, and there is a case where each light does not properly match the direction of the line of sight. Therefore, in this embodiment,
As shown in FIG. 6B, the scanning ranges 45A 'and 45B' of the LEDs 19A and 19B correspond to the scanning range 4 of the light emitting pattern.
6 so that each LED 19A, 1
In addition to controlling the light emission start time and light emission end time of the LED 9B, the LEDs 19A, 19B
However, control is performed so that pulse emission is performed at a timing different from each of the LEDs 8a.

Returning to FIG. 2, the light receiving section 20 includes a beam splitter 21 disposed on an optical path from the vibrating mirror section 10 and a second lens 22 (disposed on a branch path formed by the beam splitter 21). Hereinafter, it is referred to as a “measurement light monitoring lens 22” to distinguish it from the first lens 9), and a pair of light receiving units 23A and 23B. The configuration of the light receiving unit 20 is unitized and fixed and supported in the opening 7 b of the housing 7.

Each of the light receiving units 23A and 23B is for receiving the reflected light corresponding to the LED 19A and 19B, respectively, as shown in FIG.
9B are arranged side by side in the direction along the y-axis in accordance with the arrangement direction of 9B. Further, a pair of light receiving elements 24a, 24b, 25a, 25b are formed in each of the light receiving units 23A, 23B along the y-axis direction orthogonal to the traveling path of the reflected light.

The light from each of the LEDs 19A and 19B of the light source 19 passes through the lens 9 in the same manner as the light emission pattern of the LED array 8, is guided toward the observation window 4 by the mirror 14, and then is split by the beam splitter. The light will enter the user's eye 11 via 21. Further, the reflected light from the eye 11 with respect to the incident light is split by the beam splitter 21 and then enters the light receiving units 23A and 23B via the reflected light measuring lens 22.

The number of LEDs of the light source 19 is not limited to two, and a single LED or three or more LEDs can be installed. The numbers will also change. The number of light receiving elements formed in the light receiving units 23A and 23B is not limited to two, and three or more light receiving elements may be formed.

In FIG. 2, the focal length of the lens 9 of the image generating unit 6 is f ₁ , the distance between the LED array 8 and the lens 9 is l ₁ , the distance between the lens 9 and the vibrating mirror unit 10 is l ₂ , Assuming that the distance between the oscillating mirror unit 10 and the surface of the eye 11 is l ₃ , when the eye 11 is focused on the virtual image of the light emission pattern, the following equation (1) is established. _{1 / f 1 = 1 / l} 1 + 1 / (l 2 + l 3) ··· (1)

Similarly, the focal length of the reflected light measuring lens 22 is f ₂ , the distance between the surface of the eye 11 and the beam splitter 21 is l ₄ , the beam splitter 21 and the reflected light measuring lens 2
Assuming that the distance between the two is l ₅ and the distance between the reflected light measurement lens 22 and the light receiving units 23A and 23B is l ₆ , the image forming positions of the reflected light 50A and 50B from the eye 11 and the light receiving unit 2
When the arrangement positions of 3A and 23B are matched, the relationship of the following equation (2) is established. 1 / f ₂ = 1 / (l ₄ + l ₅ ) + 1 / l ₆ (2)

The imaging magnification m ₁ ((l ₂
+ L ₃ ) / l ₁ ) and m 2 (l ₆ / (l ₄ + l ₅ )) are all set to around 0.55, and the eye 11 is focused on the virtual image of the light emission pattern. Eyes 11
The reflected light 50A, 50B from the light receiving unit 23A,
It is set so that an image is formed at the position of 23B. At this time, the respective reflected lights 50A, 50B are, as shown in FIG. 7, divided into the inner light receiving elements 24a, 25a and the outer light receiving elements 24a, 25a.
It is assumed that the positional relationship between the respective light receiving elements is set so as to uniformly enter the light receiving elements b and 25b.

Next, the principle for detecting the displacement of the position of the eye 11 with respect to the observation window 4 and the specific method for moving the lens 9 back and forth following the displacement of the position will be described step by step. .

In the above equations (1) and (2), the distance l ₃ ,
l ₄ changes according to the position of the user's eye 11, and the distances l ₁ and l ₂ change according to the position of the lens 9. The light from the LEDs 19A and 19B of the light source 19 is reflected by the mirror surface of the vibrating mirror unit 10 via the lens 9 and enters the eye 11, so that the substantial light source is a reflected light image 45 on the mirror surface.
A, 45B (hereinafter, each LE
D19A, reflected light image 45A on the mirror surface corresponding to 19B,
45B is called a "pseudo light source").

FIG. 8 shows the relationship between the light from the pseudo light sources 45A and 45B to the eye 11 and the position of the user's eye with respect to the observation window 4. FIG. 9 shows the reflection of the reflected light from the surface of the eye 11. Indicates the status. 9A, 9B, and 9C respectively correspond to the positions A, B, and C in FIG.

Assuming now that the user's eye 11 is observing the two-dimensional image presented by the image generation unit 6 in the state of being correctly focused at the position A in FIG. , 45B from the eye 11
Then, the reflected lights 50A and 50B for the respective incident lights pass through the beam splitter 21 and the reflected light measuring lens 22, respectively, and enter the corresponding light receiving units 23A and 23B. As described above, the reflected lights 50A and 50B in this state are transmitted to the light receiving elements 24a and 25a inside the light receiving units 23A and 23B.
And the outer light receiving elements 24b and 25b are uniformly incident (hereinafter, this state is referred to as a "standard state").

Next, assuming that the position of the apparatus main body 1 or the eye 11 fluctuates from the above state and the position of the eye 11 with respect to the observation window 4 is shifted to the position B in FIG. In addition, the diameter of each incident light is widened, and the interval between each incident light is narrowed as compared with the position A. Further, since the distance l _{4 in} FIG. 2 is longer, as shown in FIG. 9B, the imaging positions of the reflected lights 50A and 50B are determined by the light receiving units 23A and 23A.
It shifts to the position before 23B. As a result, the reflected lights 50A, 50B to the respective light receiving units 23A, 23B are deviatedly incident on the inner light receiving elements 24a, 25a, and a reflected light image larger than under the standard state is generated on these elements. Become so.

On the other hand, when the position of the eye 11 with respect to the observation window 4 is shifted to the position C in front of the position A, the interval between the respective incident lights on the surface of the eye 11 increases. Further since the distance l ₄ is shortened, as shown in FIG. 9 (C), the imaging position of each reflected light is shifted to the rear position of the light receiving unit. As a result, the reflected light to each of the light receiving units 23A and 23B is deviatedly incident on the outer light receiving elements 24b and 25b, and a larger reflected light image is generated on the elements than in the standard state.

As shown in FIG. 10, the output signal of each light receiving element is input to the differential amplifier circuit 31, and the reflected light amount incident on the inner light receiving elements 24a and 25a is transmitted to the outer light receiving elements 24b and 25b. A differential amplified signal C is generated by subtracting the amount of incident reflected light, and the movable coils 17A, 17B
Is input to the driving circuit 40 (shown in FIG. 14). As shown in FIG. 11, the differential amplified signal C has a zero level under the standard condition. The positive level value increases as the eye 11 moves away from the observation window 4 and becomes negative as the eye approaches the observation window 4. Will increase. Movable coil drive circuit 4
A value of 0 controls the rotation of each of the movable coils 17A and 17B so that the lens 9 moves in a direction corresponding to the level of the signal by a distance corresponding to the level value.

That is, for a positive level differential signal,
By displacing the lens 9 toward the oscillating mirror section 10, the distance l due to the eye 11 having moved away from the observation window 4.
_For the differential signal of the negative level corresponding to the variation of ₃ , the lens 9 is displaced toward the LED array 8 to correspond to the variation of the distance l ₃ due to the eye 11 approaching the observation window 4. .

Each LED 19A, 19B of the light source 19
Is arranged at a distance l ₁ similar to the LED array 8 for image generation with respect to the lens 9, so that an appropriate two-dimensional image is provided to the user's eye 11 by adjusting the lens position described above. At this point, the pseudo light source generated on the mirror surface by the LEDs 19A and 19B is incident on the eye 11 again with the relationship of FIG. 8A, and the incident state of the reflected light on the light receiving units 23A and 23B is as follows. It will return to the standard state. Each LED 19
A and 19B do not necessarily need to be disposed at the same distance from the lens 9 as the LED array 8.
May be fixedly disposed at a predetermined position between the LED array 8 and the LED array 8.

Incidentally, the position of the eye 11 with respect to the observation window 4 may be displaced not only along the z-axis but also along the x-axis or the y-axis. The position adjusting mechanism of the lens 9 does not operate for the displacement applied in the direction.

That is, when the position of the eye 11 is displaced along the x-axis, as shown in FIGS. 12A and 12B, the reflected light images at the respective light receiving units 23A and 23B change according to the movement of the eye. Displaces parallel along the z-axis. In addition, when the position of the eye 11 is displaced along the y-axis, FIGS.
As shown in (2), the reflected light images at the respective light receiving units 23A and 23B are displaced in parallel along the y-axis. Thus, even if the eye is displaced in any of the x and y axial directions, the amount of light received on each of the inner light receiving elements 24a and 25a and each of the outer light receiving elements 2a
A large change does not appear in the differential signal with the amount of received light on 4b and 25b.

FIG. 14 shows the structure of the control circuit 3.
The control circuit 3 includes a main control unit 30 composed of a microprocessor. The main control unit 30 is provided with a display screen of an application executed internally and image data of an image captured from the outside. In addition to performing a series of operations related to image display, it controls the lens position adjustment mechanism 17 and the shift detection mechanism 18 described above. The operation keys 5 in FIG. 1 are connected to the main control unit 30.

In the figure, an image data storage unit 32, a shift register 33, a latch circuit 34, a timing control unit 35, a rightward scanning delay circuit 36a, and a leftward scanning delay circuit 36
b, the mirror driving circuit 37 and the LED driving circuit 3
8 for realizing the display of the two-dimensional image. The image data storage unit 32 stores luminance data of each constituent pixel as image data output from the main control unit 30.

The shift register 33 includes n registers corresponding to the number of pixels of the image to be displayed in the y-axis direction. The shift register 33 responds to a timing signal from a timing control unit 35 to store the image data in the image data storage 32. Each row of luminance data is sequentially output and transferred by each register, so that n pieces of luminance data to be provided to the LED array 8 are arranged in parallel.

When the one column of luminance data is generated,
The data is transferred to the latch circuit 34, and the output data from the latch circuit 34 is supplied to the LED drive circuit 38 as a control signal. Therefore, a light emission pattern corresponding to the one column of luminance data is generated by each LED 8a.
Hereinafter, by repeating the above-described series of operations, a light emission pattern according to the luminance data of each column of the image is sequentially generated.

On the other hand, a timing signal (hereinafter, simply referred to as a "displacement start instruction signal") for instructing the mirror 14 to start displacement in the forward and reverse directions is output from the timing control unit 35 to the mirror drive circuit 37. You. Each scanning delay circuit 3
Numerals 6a and 36b correspond to the aforementioned sinusoidal vibration of the oscillating mirror. Each of the circuits 36a and 36b has a delay corresponding to the time during which the mirror 14 is displaced nonlinearly near the displacement end points at both ends. Time is set. The above-described displacement start instruction signals for each direction are input to the scanning delay circuits 36a and 36b in the corresponding scanning directions, respectively, and after being delayed by the set time, are fed back to the timing control unit 35. Timing control unit 35
Receives the input of the delayed displacement start signal, starts output of luminance data from the image data storage unit 32 and output of a timing signal related to lighting of the LED 8a. Each LED 8a
In this case, light is emitted during a period in which the mirror 14 moves linearly, and the correction value of the light emission interval set in the correction circuit in the timing control unit 35 can be reduced.

Further, the timing control unit 35 outputs a timing signal to the drive circuit 39 for the light source 19 of the displacement detecting mechanism 18 and the drive circuit 40 of each of the movable coils 17A and 17B of the lens position adjusting mechanism 17. This timing signal is LE based on the principle shown in FIG.
The timing signal to the D drive circuit 38 is started after a predetermined period of time and ends before the one-way scanning of each light emission pattern is completed, and the timing signal to the LED drive circuit 38 The output is shifted. As a result, the LEDs 19A and 19B are turned on during the clearance time during which the light emission pattern is scanned, and the movable coils 17A and 17B operate based on the output signals from the light receiving units 23A and 23B corresponding to the lighting operation. The position of the lens 9 is adjusted.

Thus, the user confirms the image displayed through the observation window 4 while supporting the main body 1 with both hands. At this time, in addition to the light using the LED array 8 as a light source, light that is not detected by the user's eyes by the LEDs 19A and 19B of the light source 19 is incident on the user's eye 11, and each light receiving unit 23A of the light receiving unit 20 , 23B receive reflected light from the eye 11 with respect to the incident light. At this time, if the incident state of the reflected light on each of the light receiving units 23A and 23B is not the standard state, the lens position adjusting mechanism 1
7, the position of the lens 9 is adjusted to the optimal position,
A clear image is provided to the user.

Thereafter, in the same manner, the lens 9 is adjusted each time the position of the eye 11 with respect to the observation window 4 is displaced by the movement of the main body 1 or the head of the user.
As described above, since the adjustment is performed during the clearance time during which the light emission pattern is scanned, it is possible to adjust the position of the lens 9 far before the focusing mechanism of the user's own eye operates. . Therefore, it is possible to prevent the user from recognizing the blur of the image due to the subtle displacement of the position of the eye, and it is possible to stably display a clear image. Also, since there is no need for the user to perform focus adjustment processing,
Eye fatigue is reduced and long-term use can be tolerated.

Each LED 8a for generating a light emission pattern for an image is controlled so as to emit light while sequentially changing the luminance value, while each LED 8a of the light source 19 is controlled.
Since 9A and 19B always emit light with a constant luminance value, the amount of reflected light incident on the light receiving unit 20 is stable, and the lens position can be adjusted with high accuracy. Further light source 19
LED emits light of a wavelength that is not detected by the user
Is used, there is no risk of hindering the user's view of the image.

The present invention is not limited to the above-described apparatus, but may be applied to an apparatus that generates a two-dimensional image by using a liquid crystal display panel or the like and then enlarges the two-dimensional image using a lens to provide the enlarged two-dimensional image to the observation window. Can also be applied.

[0056]

According to the first aspect of the present invention, in a display device in which a virtual image of a light emission pattern generated through a lens is observed from an observation window, an eye of an observer is used by using optical means. It detects the amount of displacement of the eye from the position where the focal point of the eye coincides with the virtual image of the light emission pattern, and adjusts the position of the lens in the optical axis direction according to the amount of displacement, so there is no need to operate the user's eye adjustment mechanism. In addition, a clear image can be stably displayed by automatically adjusting the display position of the image to the focus of the eye. Therefore, it is possible to provide a display device that can be used for a long time by preventing fatigue of the user's eyes.

According to the second aspect of the present invention, the incident position of the reflected light and its reflection are compared by comparing the incident amounts of the reflected light on a plurality of light receiving elements arranged in a direction intersecting the optical path of the reflected light to be received. Based on the size of the light image, it is possible to easily and accurately detect how much the observer's eye is deviated from a position where a clear image can be captured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a portable device to which the present invention is applied.

FIG. 2 is an explanatory diagram illustrating a configuration of an optical system of an image display unit.

FIG. 3 is a side view illustrating a configuration of a vibration mirror unit.

FIG. 4 is an explanatory diagram showing a scanning image of a light emission pattern.

FIG. 5 is an explanatory diagram showing a positional relationship between an LED array for generating a light emission pattern and LEDs for detecting displacement.

FIG. 6 is an explanatory diagram illustrating a relationship between a scanning range of a reflected light image and a scanning range of a light emission pattern by a shift detection LED.

FIG. 7 is an explanatory diagram illustrating a configuration of a light receiving unit.

FIG. 8 is an explanatory diagram showing a state in which a reflected light image by a shift detection LED is incident on an eye.

FIG. 9 is an explanatory diagram showing a state of incidence of reflected light from an eye on a light receiving unit for each position of A, B, and C in FIG. 8;

FIG. 10 is an explanatory diagram showing a specific method for detecting an eye shift.

11 is an explanatory diagram showing the relationship between the differential amplified signal level in FIG. 10 and the movement of the eye with respect to the observation window.

FIG. 12 is an explanatory diagram showing a change in a light receiving state with respect to an eye movement in the x-axis direction.

FIG. 13 is an explanatory diagram showing a change in a light receiving state with respect to the movement of the eye in the y-axis direction.

FIG. 14 is a block diagram showing a specific configuration of a control circuit.

[Explanation of symbols]

 2 Image display unit 3 Control circuit 4 Observation window 8 LED array 9 Lens 17 Lens position adjustment mechanism 19 Light source 20 Light receiving unit 24a, 24b, 25a, 25b Light receiving element 30 Main control unit

Continuing on the front page (72) Inventor Kenji Horita, O-Muron Co., Ltd. (10) Hanazono Todocho, Ukyo-ku, Kyoto-shi, Kyoto (72) Inventor Atsushi No. 10, Hanazono-Todo-cho, Ukyo-ku, Kyoto-shi, Kyoto F term (reference) 5G435 AA01 BB04 DD05 DD10 GG02 KK03

Claims (2)

[Claims] 1. A light emitting pattern generating means for generating a light emitting pattern constituting an image, a lens for passing the light emitting pattern to generate a virtual image thereof, and an observation window for observing an image of the light emitting pattern by the virtual image. In a display device comprising: a position adjusting means for adjusting the position of the lens in the optical axis direction; and a light emitting means arranged on the light emitting pattern generating means side with respect to the lens, and projecting light toward an observation window. And a light receiving unit that is disposed with a fixed positional relationship with respect to the observation window and the light emitting unit, and receives reflected light from an observer's eye with respect to light from the light emitting unit, and a light receiving state of the reflected light in the light receiving unit. Detecting means for detecting a shift amount of the eye with respect to a position where the focus of the observer's eye matches the virtual image of the light emitting pattern; and As the lens is displaced according to the amount, a display device formed by a control means for controlling the operation of the position adjusting means. 2. The light receiving means includes a plurality of light receiving elements arranged side by side in a direction crossing an optical path of the reflected light, and the detecting means uses an incident amount of the reflected light for each of the light receiving elements. The display device according to claim 1, wherein the displacement amount of the eye is detected.