JPH11316349A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device by which a bright display screen and a large viewing angle display are achieved. SOLUTION: This display device is provided with an emitting element 100, an reflecting element 200, and a diffusing element 300. The emitting element 100 has plural emitting parts 10[1]-10[m], and each of these emitting parts 10[1]-10[m] emits light, and light individually controlled according to pixel information of an image data is made to exit in the 1st direction L1. The reflecting element 200 has a reference plane 61 and plural reflecting planes 60[1]-60[q] tilted at a 1st angle θ1 to the reference plane 61, and the reference plane 61 arranged to be tilted at a 2nd angle θ2 to the 1st direction L1, and reflects the plural light made to exit from the emitting element 100 by the reflecting planes 60[1]-60[q] in the 2nd direction L2 different from the 1st direction L1. The diffusing element 300 transforms the light reflected from the reflecting element 200 into diffused light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a display device for displaying an image.

[0002]

2. Description of the Related Art As a display device for displaying an image, for example, a device using a transmission type liquid crystal element (FIG. 18) is known. In the liquid crystal element 91 of such a display device, a liquid crystal 94 sandwiched between two transparent electrodes 92 and 93 is further sandwiched between two polarizing plates 95 and 96 whose polarization directions are orthogonal to each other. Further, in the above display device, the surface light source 97 is arranged on the back surface of the liquid crystal element 91.

In this display device, the molecular arrangement of the liquid crystal 94 is changed depending on whether or not a voltage is applied between the transparent electrodes 92 and 93, so that light from the surface light source 97 passes through the polarizing plate 96 or not. Can be controlled. Here, since the liquid crystal element 91 is divided into a plurality of pixels, an image can be displayed by controlling transmission / non-transmission of light from the surface light source 97 for each pixel.

[0004]

However, in the conventional display device, a plane light source 97 is provided by two polarizing plates 95 and 96.
There is a problem that more than half of the light from the screen is blocked, and the display screen is dark. There is also a problem that the screen is difficult to see from an oblique direction. An object of the present invention is to provide a display device capable of obtaining a bright display screen and a display with a large viewing angle.

[0005]

According to the present invention, a display device includes a light emitting element, a reflecting element, and a diffusing element. Among these, the light emitting element has a plurality of light emitting portions, emits light from each of the plurality of light emitting portions, and emits light individually controlled according to pixel information of image data in a first direction. is there. The reflection element has a reference surface and a plurality of reflection surfaces inclined at a first angle θ1 with respect to the reference surface, and is arranged with the reference surface inclined at a second angle θ2 with respect to the first direction. The plurality of reflecting surfaces reflect a plurality of lights emitted from the light emitting element in a second direction different from the first direction. The diffusion element converts light reflected from the reflection element into diffused light.

Therefore, according to the first aspect of the invention, the light emitted from the light emitting element reaches the diffusion element with almost no attenuation and is converted into the diffused light. For this reason, a bright display screen is obtained. Further, a display with a large viewing angle can be obtained. (Claim 2) The invention described in claim 2 is based on claim 1
Wherein the plurality of light emitting units are arranged in a two-dimensional matrix, the first direction is parallel to the normal direction of the arrangement surface on which the plurality of light emitting units are arranged, and the second angle θ2 is
This is set so as to satisfy P1 × tan (θ2) ≒ P2. Here, P1 is an interval between a plurality of light emitting units adjacent in a third direction orthogonal to the first direction and the second direction. P2 is an interval between a plurality of light emitting units adjacent in a fourth direction orthogonal to the first direction and the third direction.

Therefore, according to the second aspect of the present invention, even when the arrangement interval P1 and the arrangement interval P2 on the display element are not equal, the light emitted from each of the plurality of light emitting portions of the light emitting element is The positions reaching the diffusion elements are all equally spaced. Therefore, an image can be displayed on the diffusion element at an aspect ratio based on the image data. (Claim 3) The invention described in claim 3 is based on claim 2
, The first angle θ1 is defined as θ1 +
It is set so as to satisfy θ2 ≒ 45 °.

Therefore, according to the third aspect of the present invention, the reflected light from the reflecting element can be directed in a direction parallel to the plane on which the light emitting elements are arranged. For this reason, an image without distortion can be formed on a plane orthogonal to the arrangement plane. (Claim 4) The invention according to claim 4 is based on claim 2
Wherein the plurality of reflection surfaces of the reflection element are each a strip-shaped reflection surface extending in the third direction.

Therefore, according to the present invention, the reflection element can be manufactured at low cost. (Claim 5) Further, the invention described in claim 5 is based on claim 1
Wherein the plurality of lights are light emitted from a semiconductor laser diode. Therefore, according to the fifth aspect of the present invention, the light from the adjacent light emitting units does not overlap each other, and the brightness can be controlled for each pixel.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. The display device according to the present embodiment corresponds to claims 1 to 5. The display device of the present embodiment is a device that inputs a known video signal and displays an image represented by the video signal.

As shown in FIG. 1, the display device of this embodiment includes a light emitting element 100, a wave-like mirror 200 (corresponding to the "reflective element" of claim 1), and a diffusion plate 300 (claim 1). Corresponding to the “diffusion element”). The light emitting element 100 inputs a known video signal,
An element that emits a laser beam corresponding to the video signal in the direction L1. The wavy mirror 200 is an optical member that reflects the laser light emitted from the light emitting element 100 in the direction L2. The diffusion plate 300 is an optical member that diffuses the laser light from the wavy mirror 200. A display surface 301 is provided on the diffusion plate 300. The image represented by the video signal is displayed on the display surface 301.

First, the configuration of the light emitting device 100 will be described. As shown in FIG. 2, the light emitting element 100 includes a silicon substrate 1 and k fixed mirrors 20 [1] to 20 [k].
And the m pixel mirror units 10 [1] to 10 [m] (corresponding to “a plurality of light emitting units” in claim 1), the element control unit 40, the light source 30, and the light absorbing plate 2 Is provided.

The silicon substrate 1 is provided with a formation surface 1a (corresponding to "arrangement surface" in claim 2) on which electric circuits can be integrated. k fixed mirrors 20 [1] to 20 [k],
m pixel mirror units 10 [1] to 10 [m], light source 3
0, the light absorbing plate 2 is provided on the forming surface 1a. The light source 30 includes a semiconductor laser diode (hereinafter, referred to as “LD”) 31 and a collimator lens 32. The LD 31 emits a monochromatic laser beam that spreads at a predetermined solid angle. The collimator lens 32 is a lens that converts a laser beam emitted from the LD 31 into a parallel laser beam having almost no solid angle. The laser light emitted from the LD 31 passes through the collimator lens 32 and passes through the optical path 30a.
It is led to. Hereinafter, the direction of the optical path 30a is referred to as a Y-axis direction (corresponding to the "third direction" of the second aspect).

The k fixed mirrors 20 [1] to 20 [1] to 20
[k] indicates an optical path 20 along the formation surface 1a of the silicon substrate 1.
a (indicated by a dashed line in FIG. 2). Each fixed mirror 20 [1] to 20 [k] has
A reflection surface that reflects the laser light is provided. Each of the fixed mirrors 20 [1] to 20 [k] has a
It is provided at a position perpendicular to a. The position of the reflecting surface is fixed with respect to the forming surface 1a. An optical path 20a formed by such fixed mirrors 20 [1] to 20 [k] starts at a position of a pixel mirror unit 10 [1] described later and ends at a position of a light absorbing plate 2 described later. It is.

Here, of the entire optical path 20a, a straight line portion along the Y axis from the starting end to the fixed mirror 20 [1] is an optical path in which the laser light emitted from the light source 30 travels in the + Y direction. The optical path in the + Y direction is
After the direction is changed by 90 ° by [1], the direction is further changed by 90 ° by the fixed mirror 20 [2].
As a result, the fixed mirror 20 [2] changes from the fixed mirror 20 [2] to the fixed mirror 20 [3].
The straight line section along the Y axis up to becomes an optical path in which the laser light emitted from the light source 30 travels in the −Y direction opposite to the above + Y direction.

Similarly, the direction of the optical path 20a is changed by the fixed mirrors 20 [3] and 20 [4]. As a result, a straight line portion along the Y axis from the fixed mirror 20 [4] to the fixed mirror 20 [5] becomes an optical path in the + Y direction. Thereafter, the same optical path change is repeated by the fixed mirrors 20 [5] to 20 [k]. Incidentally, the straight line portion along the Y axis from the fixed mirror 20 [k-2] to the fixed mirror 20 [k-1] is -Y
The optical path in the direction, the straight line portion from the fixed mirror 20 [k] to the light absorbing plate 2 becomes the optical path in the + Y direction.

As described above, k fixed mirrors 20 [1]-
The optical path 20a formed by 20 [k] includes a plurality of linear portions (for example, 640 lines along the Y axis; only nine linear portions are shown in FIG. 2 for simplicity) in the + Y direction → −Y.
It becomes a meandering optical path that follows the direction → + Y direction →. Hereinafter, the optical path 20a changed by the fixed mirror 20 [1]
Is defined as the X-axis direction (corresponding to the “fourth direction” of claim 2).

Further, m pixel mirror units 10 [1]
10 to 10 [m] are divided into a plurality of straight portions along the meandering optical path 20a. Each straight line portion has i (eg, 480). In FIG.
11) pixel mirror units 10 [1] to 10
[i], 10 [i + 1] to 10 [2i], ..., 10 [mi +
1] to 10 [m] are arranged. In this case, the m pixel mirror units 10 [1] to 10 [m] form a 640 × 480 two-dimensional matrix array. Incidentally, the number m of the pixel mirror units 10 [1] to 10 [m] is equal to the number of pixels of a known display device of a video signal such as a television receiver.

The pixel mirror units 10 [1] to 10 [1] to 1
Regarding the arrangement interval of 0 [m], the interval P1 adjacent in the Y-axis direction is, for example, 26 μm, and the interval P2 adjacent in the X-axis direction is smaller than the above-mentioned interval P1, for example, 15 μm. Here, the configuration of the pixel mirror unit 10 [1] arranged at the start end of the optical path 20a will be described.

The pixel mirror unit 10 [1] corresponds to A in FIG.
As shown in a cross-sectional view taken along the line A (FIG. 3), the thin plate-shaped movable mirror 11 is connected to one end of each of elongated rod-shaped hinges 12 and 13 at both ends in the X-axis direction.
The other ends of the second and third poles are connected to poles 14 and 15, respectively. The poles 14 and 15 are provided on the formation surface 1a.

As described above, the movable mirror 11 is
The space 16 is formed between the movable mirror 11 and the silicon substrate 1 since the silicon substrate 1 is supported at a position away from the formation surface 1a of the silicon substrate 1 by the substrates 4 and 15. Incidentally, the above-described optical path 20a (FIG. 2) passes through this space 16 as shown in a cross-sectional view taken along the line BB in FIG. 3 (FIG. 4). The movable mirror 11 is a member having a reflection surface (not shown) for reflecting a laser beam. The movable mirror 11 is a conductor whose main component is aluminum. The shape of the movable mirror 11 is a plate having a substantially uniform thickness along the reflection surface. Movable mirror 1
The shape of the first reflecting surface is substantially square. The dimensions of the movable mirror 11 are both 10 μm in width and length (about 2.8 times the height of the poles 14 and 15) and 1 μm in thickness.
It is about.

The hinges 12, 13 are members having conductivity and elasticity. Therefore, the movable mirror 11 is centered on the vicinity of the space connecting the hinges 12 and 13,
It is rotatable while twisting the hinges 12 and 13.

On the surface 1a of the silicon substrate 1,
As shown in FIG. 4, landing electrodes 21 and 23 and drive electrodes 22 and 24 are formed. Here, the movable mirror 1
As shown in FIG. 5, the first electrode 1 and the landing electrode 21 are connected via the hinge 12 and an electrode (not shown) formed on the pole 14. Similarly, the movable mirror 11 and the landing electrode 23 are connected via the hinge 13 and an electrode (not shown) formed on the pole 15. Therefore,
The landing electrode 23, the movable mirror 11, and the landing electrode 21 are kept at the same potential.

The landing electrode 21 is connected to an output terminal 71 of the pixel mirror unit driving circuit 50 [1] in the element control section 40.
It is connected to the. The drive electrode 22 is connected to the output terminal 72 of the pixel mirror unit drive circuit 50 [1].
The drive electrode 24 is connected to the pixel mirror unit drive circuit 50 [1].
Are connected to the output terminal 74. The pixel mirror unit drive circuit 50 [1] is a circuit that applies a voltage to each of the landing electrode 21, the drive electrode 22, and the drive electrode 24. As described above, since the landing electrode 21 and the movable mirror 11 are kept at the same potential, the pixel mirror unit driving circuit 50 [1]
When a voltage is applied to the landing electrode 21, the voltage is applied to the movable mirror 11.

Here, the pixel mirror unit driving circuit 50
[1] A voltage of a different polarity is applied to the drive electrode 22 and the landing electrode 21, and a voltage of the same polarity (for example, 10 V; hereinafter, this voltage is referred to as “gradient voltage”) is applied to the drive electrode 24 and the landing electrode 21. Then, the potential of the drive electrode 22 and the potential of the movable mirror 11 have different polarities, and the potential of the drive electrode 24 and the potential of the movable mirror 11 have the same polarity.

As described above, when the polarity of the potential of the drive electrode 22 and the polarity of the potential of the movable mirror 11 are different, the drive electrode 2
An electrostatic attractive force acts between the movable mirror 2 and the movable mirror 11. When the polarity of the potential of the drive electrode 24 and the polarity of the potential of the movable mirror 11 become the same, the drive electrode 24 and the movable mirror 1
Between them, an electrostatic repulsion acts.

Therefore, the movable mirror 11 rotates around the hinges 12 and 13 as shown by the dotted lines in FIG. 4, and stops when the end in the Y-axis direction comes into contact with the landing electrode 21. At this time, the reflecting surface of the movable mirror 11 is at a position inclined by about 45 ° with respect to the normal line (Z-axis direction) of the forming surface 1a and the optical path 20a (hereinafter referred to as “reflection position”).

When the movable mirror 11 is at the reflection position, the space 1
6, the direction of the optical path 20a in the + Y direction is changed by 90 ° at the reflecting surface. The direction L1 (corresponding to the “first direction”) of the optical path 20a changed by the movable mirror 11 is parallel to the normal direction (Z direction) of the forming surface 1a. Therefore, the laser light emitted from the light source 30 is reflected on the reflection surface of the movable mirror 11 in the normal direction of the formation surface 1a, and travels to the wavy mirror 200 described later.

On the other hand, the pixel mirror unit driving circuit 50
[1] (FIG. 5) applies a voltage of the same polarity (for example, 10 V; hereinafter, this voltage is referred to as a “horizontal voltage”) to the drive electrode 22, the landing electrode 21, and the drive electrode 24, respectively.
The potential of the drive electrode 22, the potential of the movable mirror 11, and the potential of the drive electrode 24 have the same polarity. As described above, when the polarity of the potential of the drive electrode 22 and the polarity of the potential of the movable mirror 11 become the same, an electrostatic repulsive force acts between the drive electrode 22 and the movable mirror 11.

At this time, since the polarity of the potential of the drive electrode 24 and the polarity of the potential of the movable mirror 11 are the same,
An electrostatic repulsion acts between the drive electrode 24 and the movable mirror 11. When the movable mirror 11 is at the reflection position indicated by the dotted line in FIG. 4, the distance between the drive electrode 22 and the movable mirror 11 is smaller than the distance between the drive electrode 24 and the movable mirror 11, so that the drive electrode 22 The magnitude of the electrostatic repulsion acting between the movable mirror 11 and the movable mirror 11 is larger than the magnitude of the electrostatic repulsion acting between the drive electrode 24 and the movable mirror 11.

Therefore, the movable mirror 11 rotates from the reflection position shown by the dotted line in FIG. 4 to the position shown by the solid line. Then, the movable mirror 11 stops at a position where the magnitudes of the two electrostatic repulsion forces are balanced, that is, at a position parallel to the forming surface 1a (hereinafter, referred to as a “passing position”). When the movable mirror 11 is at the passing position, the direction of the optical path 20a in the + Y direction is not changed. Therefore, the laser light from the light source 30 passes through the space 16 formed below the movable mirror 11, and travels to the next pixel mirror unit 10 [2].

As described above, the pixel mirror unit 10 [1]
Then, the movable mirror 11 is moved to the reflection position or returned to the passing position, that is, the laser light from the light source 30 is reflected toward the wave-like mirror 200 or passes toward the next pixel mirror unit 10 [2]. Or can be. The image mirror units 10 [2] to 10 other than the pixel mirror unit 10 [1] configured as described above.
[m] (FIG. 2), the optical path in which the laser light emitted from the light source 30 travels in the + Y direction (starting point of the optical path 20a → fixed mirror 20 [1], fixed mirror 20 [4] → fixed mirror 20 [5] ,
.., The arrangement arranged along the fixed mirror 20 [k] → the light absorbing plate 2) is the same as that of the pixel mirror unit 10 [1], and therefore the description is omitted.

The image mirror units 10 [2] to 10 [2] to 10
[m], the optical path in which the laser beam travels in the −Y direction (fixed mirror 20 [2] → fixed mirror 20 [3],..., fixed mirror 20)
[k-2] → fixed mirror 20 [k-1]) (for example, image mirror unit 10 [i + 1] adjacent to fixed mirror 20 [2]), pixel mirror unit 10 [ 1] and the electrical connection relationship is different.

That is, the pixel mirror unit 10 [i +
In [1], as shown in FIG. 6, the landing electrode 23 is connected to the pixel mirror unit drive circuit 50 [i] in the element control unit 40.
+1] output terminal 83. Drive electrode 22
Is connected to the output terminal 82 of the pixel mirror unit drive circuit 50 [i + 1]. The drive electrode 24 is connected to the output terminal 84 of the pixel mirror unit drive circuit 50 [i + 1].

Pixel mirror unit drive circuit 50 [i + 1]
Is a circuit for applying a voltage to each of the landing electrode 23, the drive electrode 22, and the drive electrode 24. As described above, since the landing electrode 23 and the movable mirror 11 are kept at the same potential,
The pixel mirror unit driving circuit 50 [i + 1] is the landing electrode 2
When a voltage is applied to 3, the voltage is applied to the movable mirror 11.

Accordingly, when the pixel mirror unit drive circuit 50 [i + 1] applies a different polarity voltage (for example, 10 V) to the drive electrode 24 and the landing electrode 23 and the same polarity to the drive electrode 22 and the landing electrode 23, respectively. The potential of the drive electrode 24 and the potential of the movable mirror 11 have different polarities, and the potential of the drive electrode 22 and the potential of the movable mirror 11 have the same polarity. At this time, an electrostatic attraction force acts between the drive electrode 24 and the movable mirror 11, and an electrostatic repulsion force acts between the drive electrode 22 and the movable mirror 11.

As a result, as shown by the dotted line in FIG. 7, the end of the movable mirror 11 in the Y-axis direction comes into contact with the landing electrode 23, and stops at the reflection position where the reflection surface is inclined by about 45 °.
At this time, the direction of the optical path 20a in the −Y direction passing through the space 16 is changed by 90 ° at the reflection surface, and becomes a direction L1 substantially parallel to the normal direction of the formation surface 1a. Therefore, the laser light from the light source 30 is reflected on the reflecting surface of the movable mirror 11 and travels to a wavy mirror 200 described later.

The pixel mirror unit driving circuit 50
[i + 1] (FIG. 6) applies a horizontal voltage (for example, 10 V) of the same polarity to the drive electrode 24, the landing electrode 23, and the drive electrode 22.
Are applied, the potentials of the drive electrode 24, the movable mirror 11, and the drive electrode 22 have the same polarity. At this time, electrostatic repulsion acts between the drive electrode 24 and the movable mirror 11 and between the drive electrode 22 and the movable mirror 11, respectively.

When the movable mirror 11 is at the reflection position shown by the dotted line in FIG. 7, the distance between the drive electrode 24 and the movable mirror 11 is smaller than the distance between the drive electrode 22 and the movable mirror 11. The magnitude of the electrostatic repulsion acting between the drive electrode 24 and the movable mirror 11 is larger than the magnitude of the electrostatic repulsion acting between the drive electrode 22 and the movable mirror 11.

Therefore, the movable mirror 11 rotates from the reflection position shown by the dotted line in FIG. 7 to the position shown by the solid line. Then, the movable mirror 11 stops at a position where the magnitudes of these two electrostatic repulsion forces are balanced, that is, at a passing position parallel to the forming surface 1a. At this time, the direction of the optical path 20a in the −Y direction is not changed. Therefore, the laser light from the fixed mirror 20 [2] passes through the space 16 formed below the movable mirror 11, and travels to the next pixel mirror unit 10 [i + 2].

As described above, the pixel mirror unit 10 [i
+1], the movable mirror 11 is moved to the reflection position or returned to the passing position, that is, the fixed mirror 20 is moved.
The laser beam from [2] can be reflected toward a wave mirror 200 described later or can be passed toward the next pixel mirror unit 10 [i + 2]. Note that the m pixel mirror units 10 [1] to 10 [1] to 1 configured as described above are used.
At 0 [m], the hinges 12, 13 and the pole 1
Each of 4 and 15 is formed of a material that can be formed by using a micromachine manufacturing process. The landing electrodes 21 and 23 and the drive electrodes 22 and 24 are all made of aluminum. Therefore, the m pixel mirror units 10 [1] to 10 [m] are formed on the silicon substrate 1 using the same manufacturing process as the micromachine manufacturing process.
It can be formed integrally on top.

Next, a description will be given of the above-mentioned m pixel mirror units 10 [1] to 10 [m] and the element control unit 40 (FIG. 2) for individually controlling the LD 31 of the light source 30. A known video signal is externally input to the element control unit 40. As shown in FIG. 8, the element control unit 40
A synchronization circuit 41, an inversion circuit 42, a conversion circuit 43, a timing control circuit 44, m pixel mirror unit driving circuits 50 [1] to 50 [m], and an LD driving circuit 47 are provided. .

Among them, m pixel mirror unit driving circuits 50 [1] to 50 [m] correspond to m pixel mirror units 1
0 [1] to 10 [m]. The LD drive circuit 47 is connected to the LD 31. Note that the synchronization circuit 41
Is supplied with a vertical synchronizing signal and a horizontal synchronizing signal included in the video signal. The video signal included in the video signal is input to the inversion circuit 42.

The synchronizing circuit 41 generates a pixel mirror unit driving circuit 50 based on the vertical synchronizing signal and the horizontal synchronizing signal.
This circuit outputs a timing signal for synchronizing [1] to 50 [m] with the LD drive circuit 47 to the timing control circuit 44. The inverting circuit 42 is a circuit that A / D converts pixel information of a video signal into image data and stores the image data in a memory. Here, the pixel information of the image data is information indicating the brightness of each pixel (hereinafter, referred to as “luminance information”). Further, in the inverting circuit 42, the luminance information of each pixel stored in the memory is transmitted to the pixel mirror unit 1
The data is read out in the order corresponding to the arrangement order of 0 [1] to 10 [m] (in FIG. 2, the order from the beginning to the end of the optical path 20 a) and output to the conversion circuit 43. The conversion circuit 43 converts the luminance information of each pixel into the emission time TL of the LD 31 and outputs the same to the timing control circuit 44.

The timing control circuit 44 includes a synchronization circuit 41
The LD driving circuit 47 outputs an LD lighting control signal to start the lighting of the LD 31 to the LD driving circuit 47 based on the vertical synchronizing signal and the horizontal synchronizing signal input through. Further, the timing control circuit 44 outputs an LD lighting control signal (LD 31
The elapsed time T from the start of lighting) is counted.

The timing control circuit 44 outputs an LD extinguishing control signal for extinguishing the LD 31 to the LD driving circuit 47 based on the elapsed time T. The output of the LD extinguishing control signal is performed when the elapsed time T reaches the emission time TL of the LD 31 input from the conversion circuit 43. The turning on / off of the LD 31 is sequentially performed for each pixel.

Further, based on the vertical synchronizing signal and the horizontal synchronizing signal input through the synchronizing circuit 41, the timing control circuit 44
For [1] to 50 [m], the pixel mirror unit 10 [1] to
A mirror tilt control signal for tilting the movable mirror 11 of 10 [m] is individually output. The output of the mirror tilt control signal is performed one by one in an order corresponding to the arrangement order of the pixel mirror units 10 [1] to 10 [m].

The timing control circuit 44 determines the pixel mirror units 10 [1] to 10 [1] based on the elapsed time T.
The mirror horizontal control signal for returning the movable mirror 11 of [m] to the horizontal level is supplied to the pixel mirror unit driving circuits 50 [1] to 50 [50].
Output for [m]. The output of the mirror horizontal control signal is
This is always performed when the elapsed time T reaches a predetermined maximum time Tmax. This maximum time Tmax is equal to LD31
Corresponds to the maximum emission time per pixel.

The timing control circuit 44 has an internal counter N. In an initialization operation described later, the value of the internal counter N is reset to 1. When the mirror tilt control signal is input from the timing control circuit 44, the m pixel mirror unit drive circuits 50 [1] to 50 [m] apply a tilt voltage to the pixel mirror units 10 [1] to 10 [m]. Output.

The pixel mirror unit driving circuit 50
When the mirror horizontal control signal is input from the timing control circuit 44, the pixel mirror unit 10 [1] to 50 [m]
A horizontal voltage is output from [1] to [m].

The light absorbing plate 2, as shown in FIG. 2, is a member provided at the end of the optical path 20a. The light absorbing plate 2 absorbs the incident laser light. Therefore, the movable mirror 11 of the pixel mirror unit 10 [1] to 10 [m]
Are moved to the passing position and unnecessary laser light is not emitted from the light emitting element 100 even when the laser light from the light source 30 passes through the optical path 20a to the end. Thereby, generation of stray light in the display device can be prevented.

The light emitting device 100 configured as described above
Is an element that reflects the laser light from the light source 30 in the direction L1 in each of the m pixel mirror units 10 [1] to 10 [m] (FIG. 1). Next, the configuration of the wavy mirror 200 will be described. 9 (a), the wavy mirror 200
As shown in (b), the reference surface 61 and the q reflecting surfaces 6
0 [1] to 60 [q] are provided. Reflective surface 60 [1]
The number (q) of ６０60 [q] is equal to the number of linear portions along the Y axis of the optical path 20a (for example, 640; FIG. 9).
Then, nine reflecting surfaces are shown for simplicity). The q reflection surfaces 60 [1] to 60 [q] correspond to the “plurality of reflection surfaces” in claim 1.

As shown in FIG. 9A, the q reflecting surfaces 60 [1] to 60 [q] are all inclined at an angle θ1 (for example, 15 °) with respect to the reference surface 61. I have. This angle θ1 corresponds to the “first angle” of claim 1.
In addition, q reflecting surfaces 60 [1] to 60 [q] are all shown in FIG.
As shown in (b), it is an elongated strip-shaped reflecting surface. The q reflection surfaces 60 [1] to 60 [q] are planes.

The wavy mirror 200 configured as described above
Are reflection surfaces 60 [1] to 60 [q] as shown in FIG.
Are arranged such that the major axis direction is aligned with the Y axis direction. Further, as shown in FIG. 10, the wavy mirror 200 is arranged with the reference plane 61 inclined at an angle θ2 (for example, 30 °) with respect to the direction L1. In addition, 61p shown by a dotted line in FIG.
Represents the position of a plane parallel to the reference plane 61.

In the wavy mirror 200 arranged as described above, the reflection surface 60 [1] faces the pixel mirror units 10 [1] to 10 [i] in the first row of the light emitting element 100. Similarly, the reflection surfaces 60 [2],.
Pixel mirror units 10 [i + 1] to 10 [2]
i],..., pixel mirror unit 10 [m−i +
1] to 10 [m].

Therefore, the laser light emitted from each of the pixel mirror units 10 [1] to 10 [i] of the light emitting element 100 along the direction L1 enters the reflection surface 60 [1]. Similarly, the pixel mirror unit 10 of the light emitting element 100
[i + 1] to 10 [2i],..., pixel mirror unit 10
The laser light emitted along the direction L1 from each of [mi + 1] to 10 [m] is reflected by the reflecting surface 60 [2],.
[q].

Here, the reflecting surface 60 [1] in the direction L1
As shown in FIG. 10, the angle θ3 of 60 [q] is the sum of the angle θ2 of the reference surface 61 with respect to the direction L1 and the angle θ1 of the reflection surfaces 60 [1] to 60 [q] with respect to the reference surface 61. (Θ3 ≒ θ1 + θ2). In the present embodiment, the angle θ
Since 2 is 30 ° and the angle θ1 is 15 °, the angle θ3 of the reflecting surfaces 60 [1] to 60 [q] with respect to the direction L1 is 45 °.

Therefore, the reflecting surface 60 along the direction L1
The directions of the optical paths of the laser beams incident on [1] to 60 [q] are all changed by 90 ° at the reflecting surfaces 60 [1] to 60 [q]. The direction L2 (corresponding to the "second direction") of the optical path changed by the reflecting surfaces 60 [1] to 60 [q] is substantially parallel to the X-axis direction. Here, for example, the pixel mirror unit 10 [1] and the pixel mirror unit 10 [2i]
As shown in FIG. 2, the interval between the laser beams reflected in the direction L1 in each of the pixel mirror units adjacent in the X-axis direction is R2 (FIG. 11A). This interval R2 is substantially equal to the interval P2 of the pixel mirror units 10 [1] and 10 [2i] adjacent to each other in the X-axis direction. In this manner, the two laser beams adjacent to each other with the interval R2 therebetween are each a wave mirror 200
The direction is changed by 90 ° at the (reflection surfaces 60 [1], 60 [2]), and the interval is changed to R3 (≒ R2 / tan (θ2)).

Incidentally, the angle θ2 (30 °) of the reference plane 61 with respect to the direction L1 is different from the pixel mirror unit 10 [1] to
Interval P1 (26 μm) in the Y-axis direction of 10 [m] (FIG. 2)
And the distance P2 (15 μm) in the X-axis direction are set so as to satisfy the relationship of Expression (1). P1 × tan (θ2) ≒ P2 (1) Therefore, each of the pixel mirror units adjacent to each other in the X-axis direction is emitted in the direction L1 and the wavy mirror 2
The interval R3 (FIG. 11A) of the laser light reflected in the direction L2 at 00 (reflection surfaces 60 [1], 60 [2]) is the Y axis of the pixel mirror units 10 [1] to 10 [m]. It is almost equal to the interval P1 in the direction.

For example, the pixel mirror unit 10 [1]
And the pixel mirror unit 10 [2] (FIG. 2) adjacent to the pixel mirror unit in the Y-axis direction (FIG. 11).
In (b)), the interval R1 of the laser light emitted along the direction L1 is kept constant even after the direction is changed by the wavy mirror 200 (reflection surface 60 [1]). Here, the interval R1 is Y of the pixel mirror units 10 [1] to 10 [m].
It is almost equal to the interval P1 adjacent in the axial direction.

Next, the diffusion plate 300 will be described. The diffusion plate 300 (FIG. 1) is an optical member having a diffusion layer 65 in which minute irregularities are formed on one surface of a glass plate.
The other surface of the glass plate facing the diffusion layer 65 is a display surface 301 for displaying an image. The diffusion plate 300 includes the diffusion layer 6.
5 is arranged at a position substantially perpendicular to the direction L2. Therefore, the reflected light (direction L2) from the wavy mirror 200 is perpendicularly incident on the diffusion layer 65.

As shown in FIG. 12, the wavy mirror 20
When the laser light from zero enters the diffusion layer 65, it is converted into diffused light that diffuses at a predetermined solid angle. The laser light from the wavy mirror 200 converted into the diffused light is applied to the display surface 301.
From the diffusion plate 300. The region where the laser light converted into the diffused light exits from the display surface 301 is substantially circular with a diameter R1.

The laser light emitted from the display surface 301 is
It becomes light for displaying one pixel in the image represented by the video signal input to the element control unit 40. Next, the image display operation of the display device (FIG. 1) configured as described above (FIG. 13)
Steps S10 to S15) will be described. FIG.
Step shown in FIG. 7 is performed by the element control unit 40
9 is a flowchart showing a control procedure according to (FIGS. 2 and 8).

According to each step of FIG. 13, FIG.
The image display operation of one screen will be described with reference to FIG. FIG. 14 shows the pixel mirror units 10 [1] to 10-1 in the first column.
FIG. 10 is a diagram illustrating the position of a movable mirror 11 at 10 [i].
Here, FIG. 14A illustrates the pixel mirror units 10 [1] to 10 [1] when the element control unit 40 finishes performing the initialization operation.
0 [i]. FIG. 15 is a diagram illustrating the positions of the movable mirrors 11 of the pixel mirror units 10 [i + 1] to 10 [2i] in the second column. FIG. 16 shows the movable mirrors 11 of the pixel mirror units 10 [mi + 1] to 10 [m] in the last column.
FIG. FIG. 17 is a diagram illustrating the position of the laser beam reaching the diffusion plate 300.

In FIG. 14 to FIG.
Illustrations other than the above are omitted. 14 (c), (e),
FIGS. 15 (b), (d) and 16 (b) show the reflection surfaces 60 [1], 60 [2] or 60 for easy understanding.
[q] is appended. The element control unit 40 executes the image display operation once in each frame period of the video signal.

When each frame period of the video signal ends, the element control section 40 executes an initialization operation. The initialization operation includes an operation of turning off the LD 31, an operation of rotating all the movable mirrors 11 of the pixel mirror units 10 [1] to 10 [m] to the passing position, and a timing control circuit 44.
Resetting the value of the internal counter N to 1.

After completing the initialization operation, the element control unit 40 waits for timing to start each frame period of the video signal. When each frame period of the video signal starts, the element control unit 40 performs steps S10 to S1 in FIG.
5 is started. In step S10, for the N-th pixel mirror unit 10 [N] associated with the value of the internal counter N, the element control unit 40
To the reflection position. In the first control, the internal counter N
Is 1, the element control unit 40 moves the movable mirror 11 of the first pixel mirror unit 10 [1] to the reflection position. Therefore, the pixel mirror unit 10 in the first column
[1] to [i] are in the state of FIG.

In step S11, the element control section 40 turns on / off the LD 31 according to the luminance information of the Nth pixel associated with the value of the internal counter N. That is, the LD 31 is turned on for the emission time TL [N] of the LD 31 for the Nth pixel. In the first control, the LD 31 emits only the emission time TL [1] for the first pixel.
31 is turned on (the state of FIG. 14 (c)). At this time, L
The laser light emitted from D31 is continuously reflected in the direction L1 by the movable mirror 11 of the pixel mirror unit 10 [1] for the emission time TL [1]. This laser light is further reflected in the direction L2 by the reflection surface 60 [1] of the wavy mirror 200, and is reflected at the position 66 [1] of the diffusion plate 300 (FIG.
7) is reached.

The laser light reaching the position 66 [1] is converted into diffused light by the diffusion layer 65 and emitted from the display surface 301 to the outside of the diffusion plate 300. An area where the laser light converted into the diffused light is emitted from the display surface 301 is substantially circular. The laser light that has reached the position 66 [1] and has been converted into diffused light becomes light that displays the first pixel in the image represented by the video signal input to the element control unit 40.

In step S12, the timing control circuit 44 determines the elapsed time T from the start of the control in step S11 (lighting of the LD 31) and the maximum time T per pixel.
max. When the elapsed time T reaches the maximum time Tmax, the process proceeds to the next step S13. Step S13
Then, the timing control circuit 44 returns the movable mirror 11 of the pixel mirror unit 10 [N] to the passing position. Therefore, the pixel mirror units 10 [1] to 10 [i] in the first column
Returns to the state of FIG.

In the next step S14, the timing control circuit 44 increases the value of the internal counter N by one. As a result, the pixel mirror unit 10 [N] to be controlled is switched. In step S15, the timing control circuit 44 compares the value of the internal counter N with the maximum value m (the number of the pixel mirror units 10 [1] to 10 [m]). If the value of the internal counter N is equal to or less than the maximum value m, the control of all the pixel mirror units 10 [1] to 10 [m] has not been completed, and thus steps S10 to S14 are repeated. On the other hand, when the value of the internal counter N exceeds the maximum value m, the control of all the pixel mirror units 10 [1] to 10 [m] ends.

When the value of the internal counter N is 2, 1
The pixel mirror units 10 [1] to 10 [i] in the columns are in the state of FIG. 14D in step S10, and in FIG.
4 (e). At this time, the laser beam from the LD 31 is continuously reflected by the movable mirror 11 of the pixel mirror unit 10 [2] in the direction L1 for the emission time TL [2]. This laser light is further reflected in the direction L2 by the reflection surface 60 [1] of the wavy mirror 200, and
It reaches the position 66 [2] of FIG.

The laser beam that has reached the position 66 [2] is converted into diffused light by the diffusion layer 65 and emitted from the display surface 301 to the outside of the diffusion plate 300. An area where the laser light converted into the diffused light is emitted from the display surface 301 is substantially circular. The center position of the region where the laser light that has reached the position 66 [2] and is converted into the diffused light is emitted is the position 66 described above.
It is separated by the interval P1 in the Y-axis direction from the center position of the region where the laser light that has reached [1] and is converted into diffused light is emitted. At this time, the laser light emitted from the display surface 301 becomes light for displaying the second pixel in the image represented by the video signal input to the element control unit 40.

Similarly, when the value of the internal counter N is 3, the laser beam from the LD 31 is transmitted to the pixel mirror unit 1
The light is continuously reflected by the movable mirror 11 of 0 [3] in the direction L1 for the emission time Tr [3]. This laser light is further reflected by the reflecting surface 60 [1] of the wavy mirror 200 in the direction L.
2 and is reflected at position 66 [3] of the diffusion plate 300 (FIG. 17).
To reach.

The center position of the area where the laser light reaching position 66 [3] is emitted from display surface 301 is the center of the area where the laser light reaching position 66 [2] is emitted from display surface 301. It is separated from the position by an interval P1 in the Y-axis direction. As described above, while the value of the internal counter N is 1 to i, the laser light from the LD 31 is emitted from the pixel mirror units 10 [1] to 10 [i] in the first column in the direction L1 in the direction L1. ] Is continuously reflected, and the wavy mirror 200
Position 66 of the diffusion plate 300 via the reflection surface 60 [1]
[1] to 66 [i] (FIG. 17) are reached.

The laser light reaching the positions 66 [1] to 66 [i] is converted into diffused light by the diffusion layer 65 and is displayed on the display surface 301.
From the diffusion plate 300. Position 66 [1] ~
The laser light that reaches 66 [i] and is converted into diffused light and emitted from the display surface 301 is light that displays the first line in the image represented by the video signal input to the element control unit 40. become.

On the other hand, when the value of the internal counter N is (i + 1) to 2
Between i, the pixel mirror unit 10 [i + 1] of the second column
To 10 [2i] are to be controlled. At this time, the laser light from the LD 31 is supplied to the pixel mirror unit 10 [1] in the first column.
Pass through the fixed mirrors 20 [1] and 20 [2].
The light is reflected by (FIG. 2) and becomes an optical path 20a in the −Y direction. Here, when the value of the internal counter N is (i + 1), 2
Pixel mirror units 10 [i + 1] to 10 [2i] in the columns
Is the state of FIG. 15 (a) in step S10, step S1
At 1 the state shown in FIG. Therefore, the laser light from the LD 31 is continuously reflected by the movable mirror 11 of the pixel mirror unit 10 [i + 1] in the direction L1 for the emission time TL [i + 1]. This laser light is further reflected on the reflection surface 60 [2] of the wave-shaped mirror 200 in the direction L2, and reaches the position 66 [i + 1] of the diffusion plate 300 (FIG. 17).

The laser beam reaching the position 66 [i + 1] is
The light is converted into diffused light by the diffusion layer 65 and emitted from the display surface 301 to the outside of the diffusion plate 300. The center position of the area where the laser light that has reached the position 66 [i + 1] and has been converted into diffused light is emitted from the display surface 301 is the laser light that has reached position 66 [i] and has been converted into diffused light. It is separated from the center position of the region emitted from the surface 301 by the interval P1 in the Z-axis direction.

Similarly, when the value of the internal counter N is (i + 2), the pixel mirror units 10 [i + 1] to 10 [i + 1] to 10 in the second column
[2i] is the state shown in FIG. 15C at step S10, and is the state shown in FIG. 15D at step S11. At this time, LD3
The laser light from 1 is transmitted to the pixel mirror unit 10 [i + 2].
Of the emission time TL in the direction L1 by the movable mirror 11
It is continuously reflected by [i + 2]. This laser light is further reflected on the reflection surface 60 [2] of the wavy mirror 200 in the direction L2, and the position 66 [i + 2] of the diffusion plate 300 (FIG. 17).
To reach.

The center position of the region where the laser beam reaching the position 66 [i + 2] is emitted from the display surface 301 is the position 66
The laser light reaching the position 66 [i-1] is separated from the center position of the area where the laser light reaching the [i + 1] is emitted from the display surface 301 by the interval P1 in the Y-axis direction and reaches the position 66 [i-1].
1 is spaced apart from the center position of the region emitted from No. 1 by an interval P1 in the Z-axis direction.

As described above, the value of the internal counter N is (i +
Between 1) and 2i, the pixel mirror unit 10 in the second column
The light is continuously reflected in the direction L1 from each of [i + 1] to 10 [2i] for the emission time Tr [N] and passes through the reflection surface 60 [2] of the wavy mirror 200 to the position 66 [i] of the diffusion plate 300.
+1] to 66 [2i] (FIG. 17). Position 66 [i
+1] to 66 [2i] are transmitted to the diffusion layer 65.
The light is converted into diffused light by the
It is ejected outside. The laser light that reaches the positions 66 [i + 1] to 66 [2i] and is converted into diffused light and emitted from the display surface 301 is the second laser light in the image represented by the video signal input to the element control unit 40. It becomes light to display the line.

When the value of the internal counter N is the maximum value m, the pixel mirror units 10 [m-i + 1] to 10
10 [m] becomes the state of FIG. 16A in step S10, and the state of FIG. 16B in step S11. At this time, LD
The laser light from 31 is fixed mirrors 20 [1] to 20 [k].
(FIG. 2), the optical path 20a in the + Y direction reflected one after another
It is led to. Then, the laser light from the LD 31 is continuously reflected by the movable mirror 11 of the pixel mirror unit 10 [m] in the direction L1 for the emission time TL [m], and further reflected by the reflecting surface 60 [q] of the wavy mirror 200. The light is reflected by L2 and reaches the position 66 [m] (FIG. 17) of the diffusion plate 300.

The laser light reaching position 66 [m] is converted into diffused light by the diffusion layer 65 and emitted from the display surface 301 to the outside of the diffusion plate 300. The laser light that reaches the position 66 [m] and is converted into diffused light and emitted from the display surface 301 displays the m-th pixel in the image represented by the video signal input to the element control unit 40. Become light. In this way, by repeatedly performing the processing of steps S10 to S15 in FIG. 13, the pixel mirror units 10 [1] to 10 [1] to 10
[m] The reflected light of the LD 31
It is guided to positions 66 [1] to 66 [m] of 00, and the image display operation of one screen is completed.

Since these positions 66 [1] to 66 [m] are all equally spaced, an image having an aspect ratio based on the video signal is displayed on the diffusion plate 300. The above-described one-screen image display operation (the processing of steps S10 to S15 in FIG. 13)
Is about 1/30 second. When displaying the image of the next screen, the above-described step S10
What is necessary is just to perform the process of -S15 again.

In the above-described embodiment, the movable mirror 11 is stopped at the reflection position for a certain time, and the emission time TL of the laser light emitted from the LD 31 is controlled in accordance with the luminance information included in the image data. Although the example in which the image is displayed has been described, the image can be displayed by controlling the time during which the movable mirror 11 is stopped at the reflection position according to the luminance information. In this case, the lighting of the LD 31 is continued until the image display of one screen is completed.

In the above-described embodiment, an example in which one LD 31 is disposed on the light source 30 and a monochrome image is displayed has been described. However, a color image can be displayed. When a color image is displayed, the light source 30 may be provided with a red LD, a green LD, and a blue LD, and a half mirror that combines laser light emitted from each of them into one optical path 30a.

The same operation as the above-described monochrome image display is performed by the red LD (display of a red image).
Then, by performing with a green LD (display of a green image) and further with a blue LD (display of a blue image),
A single-screen color image can be displayed (screen-sequential operation). The time required to display a color image on one screen is about 1/3.
Since the time is 0 second, a red image, a green image, and a blue image are displayed in this order, so that the image can be visually recognized as a color image. Also,
A color image is displayed by sequentially or simultaneously turning on the red LD, the green LD, and the blue LD when one movable mirror is tilted while performing the same operation as the monochrome image display described above (dot sequential). Can also be performed.

In the above-described embodiment, an example is described in which the angle θ2 of the reference surface 61 with respect to the direction L1 is 30 °, and the angle θ1 of the reflection surfaces 60 [1] to 60 [q] with respect to the reference surface 61 is 15 °. However, these angles θ2 and θ1 are
It can be set to any value. However, the angle θ2
Is the arrangement interval of the pixel mirror units 10 [1] to 10 [m] (interval P1 in the Y-axis direction, interval P2 in the X-axis direction).
And it is preferable to satisfy the relationship of the above equation (1). In this case, the pixel mirror unit 1 of the light emitting element 100
Laser light emitted from each of 0 [1] to 10 [m]
The positions 66 [1] to 66 [m] reaching the diffusion plate 300 are all equally spaced. Therefore, an image can be displayed on the diffusion plate 300 at an aspect ratio based on the video signal.

In addition, the angle θ2 is 0 ° <θ2 ≦ 45 °
Is preferably set to a value within the range. in this case,
Pixel mirror units 10 [1] to 10 of light emitting element 100
Even when [m] is arranged such that the interval P2 in the X-axis direction is smaller than the interval P1 in the Y-axis direction, an image can be displayed on the diffusion plate 300 at an aspect ratio based on a video signal. Therefore, the size of the display device can be reduced.

Further, the angle θ2 and the angle θ1 are the angle θ
It is preferable that the sum of 2 and the angle θ1, that is, the angle θ3 of the reflecting surfaces 60 [1] to 60 [q] with respect to the direction L1 be set to 45 °. In this case, the wavy mirror 20
Since the reflected light from 0 is perpendicularly incident on the diffuser plate 300, the reflected light from the wavy mirror 200 is scattered around the normal direction of the display surface 301 by the diffusion layer 65. Therefore, the brightest image can be displayed in the normal direction of the display surface 301.

In the above-described embodiment, the distance P1 between the pixel mirror units 10 [1] to 10 [m] in the Y-axis direction is set to two.
6 μm and the interval P2 in the X-axis direction was set to 15 μm, but these intervals P1 and P2 were
Any value may be used as long as it is larger than the size of the movable mirror 11 of [1] to 10 [m].

Further, in the above-described embodiment, the tilt angle of the movable mirror 11 of the light emitting element 100 is set to 45 °.
If the inclination angles of the movable mirrors 11 are almost equal, the inclination angles may be set to other than 45 degrees. In the above-described embodiment, the example in which the landing electrodes 21 and 23 of the light emitting element 100 are connected to each other has been described. However, the respective electrodes are separated, and the voltages applied to these electrodes are controlled independently of each other. You may.

Further, in the above-described embodiment, the example in which the element control section 40 of the light emitting element 100 is provided on the silicon substrate 1 has been described. In this case, an external circuit equivalent to the element control unit 40 is required to drive the light emitting element 100. Further, in the above-described embodiment, the example in which the light source 30 of the light emitting element 100 is provided on the silicon substrate 1 is described, but the light source 30 may not be provided on the silicon substrate 1. In this case, in order to display an image with the light emitting element 100, a light source for emitting laser light to an optical path 20a formed by the k fixed mirrors 20 [1] to 20 [k] is required outside.

Further, in the above-described embodiment, the fixed mirrors 20 [1] to 20 [2] whose reflecting surfaces are fixed to the forming surface 1a are provided.
The light-emitting element in which the optical path 20a is formed by 0 [k] has been described as an example. However, a light-emitting element in which a similar optical path is formed by a movable mirror that can move while maintaining a reflection surface perpendicular to the formation surface 1a is used. You can also. Further, in the above-described embodiment, the diffusion plate 300 in which the diffusion layer 65 is formed only on one surface is used, but a diffusion plate in which the diffusion layer is formed on both surfaces may be used.

[0095]

As described above, according to the first to fifth aspects of the present invention, the light emitted from the light emitting element is transmitted to the diffusion element without being attenuated only through the reflection element. Since the light arrives and is converted into diffused light, a bright display screen and a display with a large viewing angle are obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of a display device according to an embodiment.

FIG. 2 is a schematic diagram illustrating a configuration of a light emitting element 100.

FIG. 3 is a cross-sectional view of the pixel mirror unit 10 [1] taken along line AA in FIG.

4 is a sectional view of the pixel mirror unit 10 [1] taken along line BB in FIG. 3;

FIG. 5 is a block diagram showing an electrical configuration of the pixel mirror unit 10 [1].

FIG. 6 is a block diagram illustrating an electrical configuration of a pixel mirror unit 10 [i + 1].

FIG. 7 is a sectional view of the pixel mirror unit 10 [i + 1].

FIG. 8 is a block diagram illustrating an electrical configuration of an element control unit 40 of the light emitting element 100.

FIGS. 9A and 9B are a side view and a front view, respectively, showing the configuration of a wavy mirror 200. FIGS.

FIG. 10 is a diagram illustrating an arrangement relationship of a wavy mirror 200;

11 is a diagram illustrating an optical path of a laser beam emitted from the light emitting element 100. FIG.

FIG. 12 is a diagram illustrating diffusion of laser light in a diffusion plate 300.

FIG. 13 is a flowchart illustrating an image display operation of the display device.

14 is a side view showing various states of the light emitting device 100. FIG.

15 is a side view showing various states of the light emitting device 100. FIG.

16 is a side view showing various states of the light emitting device 100. FIG.

FIG. 17 is a diagram illustrating a position of a laser beam reaching a diffusion plate 300.

FIG. 18 is a schematic diagram illustrating a configuration of a conventional display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Silicon substrate 1a Forming surface 2 Light absorption plate 10 [1] -10 [m] Pixel mirror unit 11 Movable mirror 12,13 Hinge 14,15 Pole 16 Space 20 [1] -20 [k] Fixed mirror 20a Optical path 21, Reference Signs List 23 landing electrode 22, 24 drive electrode 30 light source 31 LD 32 collimator lens 40 element control unit 41 synchronization circuit 42 inversion circuit 43 conversion circuit 44 timing control circuit 47 LD drive circuit 50 [1] to 50 [m] pixel mirror unit drive circuit 60 [1] to 60 [q] Reflecting surface 61 Reference surface 65 Diffusion layer 66 [1] to 66 [m] Position 100 Light emitting element 200 Wavy mirror 300 Diffusing plate 301 Display surface

Claims (5)

[Claims] 1. A light emitting element having a plurality of light emitting units, emitting light emitted from each of the plurality of light emitting units, and individually controlled according to pixel information of image data, in a first direction; A reference surface and a plurality of reflection surfaces inclined by a first angle θ1 with respect to the reference surface;
And a plurality of lights emitted from the light emitting element are reflected by the plurality of reflecting surfaces in a second direction different from the first direction. A display device comprising: a reflection element; and a diffusion element that converts light reflected from the reflection element into diffused light. 2. The display device according to claim 1, wherein the plurality of light-emitting units are arranged in a two-dimensional matrix, and the first direction is a direction of an arrangement surface on which the plurality of light-emitting units are arranged. P1 is a distance between the plurality of light emitting units that are parallel to the line direction and are adjacent to each other in a third direction orthogonal to the first direction and the second direction.
When the interval between the plurality of light emitting units adjacent in the fourth direction orthogonal to the first direction and the third direction is P2, the second angle θ2 is P1 × tan (θ2) ≒ A display device satisfying P2. 3. The display device according to claim 2, wherein the first angle θ1 satisfies θ1 + θ2 ≒ 45 °. 4. The display device according to claim 2, wherein each of the plurality of reflection surfaces of the reflection element is a band-shaped reflection surface extending in the third direction. 5. The display device according to claim 1, wherein the plurality of lights are lights emitted from a semiconductor laser diode.