SE538110C2 - Projection device and method of operation of projection device - Google Patents

Abstract

The invention relates to a projection device with a laser device (20), which is designed to generate a laser beam (L), with an adjustable micromirror device (10), which is designed to set a projection area (PB) as a sub-area ( TB) of a total projection area (GB) of the micromirror device (10) and to create an image (B) on a projection surface (PF) by deflecting the laser beam (L) within the projection area (PB), and with a computer device (30 ), which is designed to control the adjustable micromirror device (10) and the laser device (20) in such a way that a predetermined contrast value with the installed projection area (PB) can be achieved in the image (B) created on the projection surface (PF).

Description

538 1 Description Title Projection device and method for operating a projection device The invention relates to a projection device and a method for operating a projection device.

Kand Engineering Patent DE 10 2004 060 576 A1 describes a method of choice as an image projector for image projection, in which a projection beam is modulated in intensity and guided over a projection surface by deflection in a double-axis scanner for the production of an image.

In the method described therein, during the image projection, an instantaneous position value is always read, which is coupled to an instantaneous position of the projection beam on the projection surface, a local image information which is coupled to the instantaneous position is read from an image memory and the intensity of the projection beam is adjusted. .

Patent DE 10 2005 002 190 A1 describes a scanner for scanning an external relief on an object. The scanner described therein comprises a projector as designed to conduct a light beam in an illumination line above the surface relief to obtain an illuminated stall on the surface relief, the projector further being designed to output a projection signal with which the position of the light beam on the illumination line can be conducted.

Furthermore, the scanner described therein comprises a collector with a collector micromirror which can be rotated in two dimensions and a point-shaped light detector, whereby the collector micromirror arranged to rotate in a first direction of the illumination line and a second direction deviating from the first direction p5 in such a way that a reflection of the illuminated stable within a scanning area of the microscanner mirror with it can be imaged on the point light detector.

Furthermore, the collector of the scanner described therein is designed so that it outputs a detection signal with which a position of the illuminated stable can be deduced in the first and the second direction. 1 538 1 Micro-mirror projectors are used in particular for miniaturized projectors. One- and two-axis micromirror projectors are used. In order to achieve a high durability of micromirror projectors, a glass enclosure is used which hermetically seals the micromirror projector, whereby reflectors are generated which can be reflected on the projection surface.

Disclosure of the Invention The present invention provides a projection device having the features of claim 1 and a method of operating a projection device according to claim 8.

Advantages of the invention The idea of the present invention is to provide a projection device with a tapered hermetic and transparent interface, which makes it possible to achieve a high contrast ratio for demanding applications, such as e.g. a head-up display, abbreviated HUD, or a display aimed at the viewer or a display in the field of view. In this way, the high contrast ratio is achieved by selecting an appropriate sub-area of a total projection area. In this way, the image of the projection device is projected only in the sub-area of the total projection area, which enables a corresponding Mgt contrast ratio.

Advantageous embodiments and further developments appear from the subclaims saval as the description, with reference to the figures.

In one embodiment of the invention, it is contemplated that the installable micromirror device is configured as an encapsulated micromirror scanner for laser projection or imaging applications. The operation of the micromirror device as an encapsulated micromirror scanner in a local vacuum environment entailed the advantage of a reduction in the vaporization of the movements of the micromirror due to gas molecules, whereby scanning with the highest frequency is possible even at wide scanning angles and low drive voltages.

In one embodiment of the invention, it is envisaged that the installable micromirror device is designed as a single-axis or biaxial micromirror scanner for laser projection or image reproduction applications. Thereby, the advantage of a fast image construction can be achieved in the scanning image projection. In an embodiment of the invention, it is envisaged that the adjustable projection device is designed as a laser projection device for display in the field of view. It has the advantage that important information can be projected in a field that is included in the field of view display.

According to an embodiment of the invention, it is envisaged that the projection area is adjustable depending on the operating data of the projection device. This has the advantage of allowing the projection area to be optimally adapted to the operating data of the projection device.

According to an embodiment of the invention, it is envisaged that the projection area is adjustable based on predeterminable contrast value data for the sub-areas in the total projection area of the micromirror device. Thereby, a user of the projection device can set the desired contrast values individually for the current projection area of the image projection.

According to an embodiment of the invention, it is envisaged that the predetermined contrast value in the created image is predetermined based on an angular range of the image created by the projection device. This has the advantage that the predetermined contrast value can be adapted to the current angular range of the image projection.

The described designs and further developments can be combined with each other in any way.

Other possible embodiments, further developments and applications of the invention also comprise such, not explicitly mentioned, combinations of previous or in the following features which are described in the design examples.

Brief Description of the Drawings The accompanying drawings are intended to provide a further understanding of the embodiments of the invention. They incorporate embodiments and, together with the description, serve the purpose of explaining the principles and concepts of the invention.

Other embodiments and several of the named advantages tam & of the drawings. The reproduced elements of the drawings are not necessarily scalable in relation to each other.

Fig. 1 shows a schematic representation of a projection device according to an embodiment of the invention; Fig. 2 shows a schematic representation of a projection device according to a further embodiment of the invention; Fig. 3 shows a schematic representation of a projection device according to yet another embodiment of the invention; Fig. 4 shows a schematic representation of a diagram of a total projection area from the projection device for clarifying the invention; Fig. Shows a schematic representation of an adjustable micromirror device according to yet another embodiment of the invention; Fig. 6 shows a schematic representation of a diagram of a total projection area of the projection device for clarifying the invention; and Fig. 7 shows a schematic representation of a river diagram of a method for operating a projection device according to yet another embodiment of the invention; In the figures of the drawing, like reference numerals denote identical or functionally identical elements, components, constituents or process steps, unless otherwise indicated.

Fig. 1 shows a schematic representation of a projection device according to an embodiment of the invention; The projection device 100 shown in Figure 1 comprises two adjustable micromirror devices 10, each of which comprises a hermetic encapsulation in the form of a protective glass device 62, where stray light artifacts are formed as stray light reflectors SR.

Projection device 100 further comprises, for example, a laser device 20 and a computer device 30. The laser device (20) is thereby designed, for example, to generate a laser beam L. root, spruce or, among other things, spectral color.

The adjustable micromirror device 10 can be challenged as MEMS or MOEMS, in English micro-electro-mechanical system or micro-optoelectro-mechanical system, in Swedish microelectronic system or optoelectronic system.

The adjustable micromirror device 10 is designed, for example, to set a projection area PB as a sub-area TB of a total projection area GB of the micromirror device 10 and by deflecting the laser beam L within the projection area PB to create an image B on a projection surface PF.

The double-adjustable micro-mirror devices 10 can be designed as double-axis or a double-axis micro-mirror scanner for laser projection or bilating applications.

Furthermore, each of the two adjustable micromirror devices 10 may be challenged as a hermetically encapsulated MEMS or MOEMS mirror scanner.

The hermetic encapsulation of the MEMS and MOEMS systems, respectively, on the silicon wafer disk of the adjustable micromirror devices 10 provides a secure and easy achieved lasting protection for the MEMS component against contaminants of all kinds and thus enables an unlimited functionality of the adjustable micromirrors.

For example, the computer device 30 is programmed to control the adjustable micromirror device 10 so that a predetermined contrast value with the installed projection area PB can be achieved in the image B created on the projection surface PF.

A first of the two adjustable micromirror devices 10 is thereby designed to rasterize the image B in the vertical direction. The other of the two adjustable micromirror devices 10 is thereby designed to rasterize the image B in the horizontal direction.

The Dada micromirror devices 10 continuously scan image B over the total projection area GB. However, the laser beam L is generated by the laser device 20 only during the rasterization of the sub-area TB of the total projection area GB, which meant that an image B is projected only within the sub-area TB. The protective glass devices 62 are designed to hermetically encapsulate the adjustable micromirror device 10. In this case, the protective glass devices 62 can be fixed by the encapsulation hall device 50. The encapsulation hall devices 50 can be designed as partial encapsulation units in the projection device 100 and serve as fixing of individual components in the projection device 100, such as e.g. the protective glass devices 62 or the adjustable micromirror devices 10 or the computer device 30.

As shown in Figure 1, two adjustable micromirror devices 10 can be used in projection device 100.

When projecting the image B on the projection surface PF, however, several imaging errors occur.

These imaging errors or aberrations constitute deviations from the ideal optical image in the projection device 100, deviations that are affected by optical systems such as an encapsulation of the adjustable micromirror device 10 in the protective glass device 62.

In addition to diffused stray light, stray light reflexes can also occur. Spotlight reflectors SR occur, for example, on refractory glass surfaces in the protective glass device 62. As a result, clear light spots can appear in the image B. The spotlight reflectors SR cannot be completely eliminated for physical reasons, but they can be greatly reduced reflecting surfaces on the protective glass devices 62.

The surfaces of the protective glass devices 62 function have at least partly a mirror. The spotlight reflectors SR are generated by the partially reflecting surfaces.

With an anti-glare coating, abbreviated AR coating, the SR beam reflectors can be reduced to approximately 1% of the intensity of the laser beam. If the reflecting surfaces of the protective glass devices 62 are not inclined, the spotlight reflectors SR are present in Fig. B.

The stray light reflections SR from the reflecting surface of the first adjustable micro-mirror device 10 are reflected horizontally by the second adjustable micro-mirror device 10. As a result, an horizontal line in image B emerges as an optical artifact.

The stray light reflections SR from the reflecting surface of the second adjustable micromirror device 10 are reflected vertically. As a result, an vertical line in image B emerges as an optical artifact. 6 538 1 The spotlight reflectors SR thus together create cross-shaped artifacts in image B.

Image B is structured as an array of pixels. Thereby, the intensity in the vertical lines is affected by the number of columns in Figure B, and the intensity in the horizontal lines is affected by the number of rows in Figure B.

At a reflex intensity on the surface of 1 ° A and 850 gaps, the intensity of the vertical line amounts to 850 x 0.01 = 8.5. Thus, the beam reflexes are 8.5 times brighter than the average intensity of a pixel. Therefore, in order to avoid the SR light reflections, these areas are hidden in the image projection.

The individual laser beams L1, L2, L3 correspond to a desired ideal optical image and represent different scanning angles within the projection area PB.

For example, the individual laser beam L1 represents the laser beam which is advanced by the second micromirror device 10 to a position extremely far to the right. The individual laser beam L2 represents the laser beam which is deflected by the second micromirror device 10 to a zero position. The individual laser beam L3 represents the laser beam which is deflected by the second micromirror device 10 to a position extremely far to the left.

The projection device 100 may further comprise a memory device 40 which is connected to the computer device 30. In the memory device 40, for example, predeterminable contrast value data for the sub-areas TB is stored in the total projection area GB of the micro-mirror device 10. Thus, the sub-areas TB can be selected by the computer device as the projection area PB.

The computer device 30 and the memory device 40 are designed, for example, as a processor unit or as another electronic data processing unit. The computer device 30 is designed, for example, as a microcomputer, also called a pController, which, in addition to a processor, also combines units for peripheral functions in the same IC circuit.

Fig. 2 shows a schematic representation of a projection device according to yet another embodiment of the invention.

In contrast to the embodiment shown in Figure 1, the projection device 100 in the embodiment shown in Figure 2 has protective glass devices 62 with stray light reflectors SR from food. 7 538 1 The stray light reflectors SR shown in Figure 2 are generated by the rear surface p5! Dada protective glass devices 62 after deflection in the adjustable micromirror devices 10. breathe the contrast in image B.

The stray light reflectors SR from the second adjustable micromirror device 10 are projected in the image B. Due to the inclination of the protective glass devices 62, the stray light reflectors SR are not imaged within a central body in Fig. B.

The geometry of the stray light reflectors SR is shown in more detail in Figure 6 below. Starting from the individual laser beam L2, the beam light reflectors SR p5 projection surface PF are further shown.

The other male display characters in Figure 2 have already been described in the description of Figure 1 and are therefore not explained further.

Figure 3 shows a schematic representation of a projection device according to yet another embodiment of the invention.

In contrast to the embodiment shown in Figure 1, the projection device 100 in the embodiment shown in Figure 3 has protective glass devices 62 which are positioned in the zero position. Has appearing spotlight reflectors.

The other male display characters in Figure 3 have already been described in the description of Figure 1 and are therefore not explained further.

Figure 4 shows a schematic representation of a diagram of a total projection area from the projection device as a clarification of the invention.

P5 The X-axis indicates the X-coordinate of a point coordinate in Fig. B in mm. The Y-axis shows the Y-coordinate of the point coordinates in Figure B. Different gratons Merger the intensity value of the current point coordinates in the diagram according to the scale shown next to the diagram.

Figure 4 shows a simulation of a dot matrix PM projected as image B with the multiple spotlight reflectors SR created by the protective glass device 62. The intensity scale is logarithmic and darker graton represents a higher intensity value in relative intensity. The points displayed in the form of the regular dot matrix PM are the directly projected points. The points that deviate from them are points that are based on spotlight reflectors SR and show approximately 1/100 of the intensity of the directly projected points in the point matrix.

As a contrast value, in the left, first sub-area B1, due to the large number of spotlight reflectors SR, only a value of approximately a factor of 200: 1 can be achieved.

In the right, second sub-area B2 of the projected image B, there are no clear spotlight reflectors SR. In this second sub-area B2, the contrast value can ideally achieve a contrast value of up to 10000: 1.

Figure 5 shows a schematic representation of an adjustable micromirror device according to yet another embodiment of the invention.

Figure 5 Merges in detail the reflectors SR which occur in the micromirror device 10 and shows in particular the angles between the incident laser beam Lin and a reflected laser beam Lrfl.

An embodiment of an adjustable micromirror device 10 is shown in detail in Figure 6. The Merger beam sequence has an incident laser beam Lin and a reflective laser beam Lrfl.

The angles shown in Figure 5 are defined as follows: a, the angle between the incident laser beam Lin and the normal NOS has the mirror surface SO in the zero position. 13, the angle between the normal has the mirror surface SO rotated to any position relative to the normal has the mirror surface SO in the zero position. y is the angle between the normal NOG of the glass plate relative to the normal NOS has the mirror surface SO in the zero position. If the angle is the scanning direction relative to the normal NOS, the mirror surface SO is in the zero position. cp is the angle between the reflected laser beam Lrfl and the normal has the mirror surface SO in the zero position. As the incident laser beam Lin is reflected in the mirror surface SO of the adjustable micromirror device 10, during the continued beam path of the laser beam L, beam light reflections SR appear on the protective glass devices 62 designed as glass panes.

On the surface of the protective glass device 62, the reflected laser beam Lrfl is partially reflected back below the angle 0 + 2y. The reflected laser beam Lrfl is deflected again from the mirror surface SO of the micromirror device 10 and deflected again in the direction of the projected image B, whereby the contrast value of the image B decreases and decreases.

The angular difference 6 between the scanning angle and the angle of the stray reflectors SR is given by: 6 = Oo - 90 = (a-413 + 2-ya) - (a + -213) = 2y-2f3 , is given by the ratio r: r = (y-13) / (213) This ratio r therefore consequently depends only on the inclination of the glass sheet y and the scanning angle 13. Thereby, the proportional values of the! for r pa about 1/3 is achieved.

Thereby, for example, an image B is projected with an image format 16: 9, whereby 16 moves to the length and 9 to the height, with a factor of 16 times the ratio r.

Figure 6 shows a schematic representation of a diagram of a total projection area from the projection device as a clarification of the invention.

In order to create as high a contrast value as possible in the image B, a projection area PB of an adjustable micromirror device 10 is set as a sub-area TB of the total projection area GB of the micromirror device 10.

Figure 7 shows a schematic representation of a flow diagram for a method for operating a projection device according to yet another embodiment of the invention.

As a first step in the method, ring Si is generated by a laser beam L via a laser device 20. 538 1 As a second step in the method, installation S2 of a projection area PB takes place with an adjustable micromirror device 10 as a sub-area TB of the total projection area GB of the micromirror device 10; and As a third step in the method, a deflection S3 of the laser beam L occurs within the projection area PB, to create an image B on a projection surface PF and control the adjustable micromirror device 10 and the laser device 20, to obtain with the installed projection area PB a predetermined contrast value in the projection area PB. on the projection surface PF created the image B.

The steps in the procedure can then be repeated iteratively or recursively in any order.

Although the present invention has been described above with the aid of preferred embodiments, it is not limited thereto but can be modified in a variety of ways. In particular, the invention may be modified or modified in a variety of ways without departing from the spirit of the invention. 11

Claims (9)

A projection device comprising: - a laser device (20), designed to generate a laser beam (L); - an adjustable micro-mirror device (10), designed to set a projection area (PB) as a sub-area (TB) of a total projection area (GB) has the micro-mirror device (10) and to deflect the laser beam (L) within the projection area ( PB) create an image (B) on a projection surface (PF); wherein the adjustable micromirror device (10) has a hermetic encapsulation in the form of a protective glass device (62); wherein the light reflections (SR) are generated by the partially reflecting surfaces of the protective glass device (62); and - a computer device (30) designed to control the adjustable micromirror device (10) for installing the projection area (PB) and the laser device (20) so that, at the installed projection area (PB), a predetermined contrast value between the on the spotlight reflectors (SR ) the based points and the directly projected points in the image (B) created on the projection surface (PF) are achieved. The projection device (100) of claim 1, wherein the adjustable micromirror device (10) is configured as an encapsulated micromirror scanner for laser projection or imaging applications. A projection device (100) according to any one of claims 1 and 2, wherein the adjustable micromirror device (10) is designed as a single-axis or two-axis micromirror scanner for laser projection or imaging applications. A projection device (100) according to any one of the preceding claims, wherein the projection device (100) is designed as a laser projection device for a field of view display. 12 538 1 A projection device (100) according to any one of the preceding claims, wherein the projection area (PB) can be set alit according to the operating data from the projection device (100). A projection device (100) according to any one of the preceding claims, wherein the projection area (PB) can be set depending on predeterminable contrast value data for the sub-area of the total projection area (GB) of the micromirror device (10). A projection device according to any one of the preceding claims, wherein the predetermined contrast value in the created image (B) is predetermined depending on an angular range of the image (B) created by the projection device (5). Method for operating a projection device by means of the following method steps: 1. generating (S1) a laser beam (L) via a laser device (20); Installing (S2) a projection area (PB) of an adjustable micromirror device (10) as a sub-area (TB) of the total projection area (GB) of the micromirror device (10); and 3. deflecting (S3) the laser beam (L) within the projection area (PB) by means of the adjustable micromirror device (10), to create an image (B) on a projection surface (PF); wherein the adjustable micromirror device (10) has a hermetic encapsulation in the form of a protective glass device (62); wherein the stray light reflectors (SR) are generated by the partially reflecting surfaces of the protective glass device (62); and controlling the adjustable micromirror device (10) for installing the projection area (PB) and the laser device (20), in order to obtain on the installed projection area (PB) a predetermined contrast value between the points based on the beam reflex (SR) and the directly projected points in the image (B) created on the projection surface (PF). 13 538 1 17 rlacAe LtS 538 1 KN.§ 9k. ". CN1c: * € 41 LS- 538 1 t = 3 538 1 3 3 4; C., ..Gb, gArgra, 4) C .;;. ■ (.; 3 3 3 3 3 3 3 e 0 0 0 0 0 0 9. ZNI a g = 3 'kr) [w w] 538 1 5/7 Nwts kb 0 a tts; , r 10, 4. ^ \; 4, „„.; ga ".a, AP, aa aa la a 0 a 0 0 4 0 0 0-0 - *, t 06 - '0 0 6 ett 0 ro0 0 0% a 0 00 t 6 0 0 a 0 6 6 6 1 . \ vA 77. 1. \ A SON OS 00)) 09 05 Vuld eiZzr 538 1 717 TB GB TB