TWM567377U - Projection display device - Google Patents

Abstract

A projection display device includes a light source module, a switch, and a plurality of micro-scanning mirrors. The light source module provides a light beam. The switch receives the light beam, and switches the direction of the light beam to the corresponding one of the plurality of micro-scanning mirrors during each of a plurality of periods. The plurality of micro-scanning mirrors cause the light beam to scan in a plurality of projection surface to form a plurality of image. The projection display device may project the plurality of images on the plurality of projection surfaces without image brightness loss.

Description

Projection display device

The present invention relates to a projection display device, and more particularly to a projection display device applicable to a vehicle.

When the conventional projection display device is applied to a vehicle, it is usually projected only on a projection surface on the windshield of the vehicle, thereby generating a virtual image outside the windshield, mainly for providing the driver to view the content presented by the virtual image. However, the passengers in the car can't see the virtual image, or although the virtual image is seen, the image quality is very poor. In order to improve this problem, an improved projection display device has been developed which has a microstructure on the projection surface of the windshield, such as a micro-lens array (MLA), to increase the viewing angle of the virtual image. Let the passengers in the car see this virtual image. However, this microstructure will result in loss of image brightness and reduced image quality.

The purpose of the present invention is to provide a projection display device that can project a plurality of images on a plurality of projection surfaces without loss of image brightness.

In order to achieve the above object, the present invention proposes a projection display device comprising a light source module, a switch, and a plurality of micro-scanning mirrors. The light source module provides a light beam. The switch receives the beam and switches the direction of transmission of the beam to a corresponding micro-scanning mirror in the micro-scanning mirrors during each of the plurality of periods. The micro-scanning mirrors scan the light beam across a plurality of projection surfaces to form a plurality of images.

In an embodiment of the present invention, the micro-scanning mirrors include a first micro-scanning mirror and a second micro-scanning mirror, the periods including a first period and a second period, the projection surfaces including a first projection surface and a second projection The images include a first image and a second image. The switch switches the direction of transmission of the beam to the first micro-scanning mirror during the first period, the first micro-scanning mirror scanning the beam at the first projection surface to form a first image. The switch switches the direction of transmission of the beam to the second micro-scanning mirror during the second period, and the second micro-scanning mirror causes the beam to scan on the second projection surface to form a second image.

In an embodiment of the present invention, the light source module includes a plurality of light sources and an optical system. The light sources provide a plurality of sub-beams of different colors. The optical system receives the sub-beams and combines the sub-beams into a beam.

In an embodiment of the present invention, the switch includes a liquid crystal lens (LC lens).

In an embodiment of the present invention, the projection surfaces are separated, adjacent or interlaced.

In an embodiment of the present creation, the projection display device is applied to a vehicle.

In an embodiment of the present invention, the projection surfaces are located on the windshield and/or the inner surface of the roof of the vehicle.

By means of a switch (such as a liquid crystal lens), the direction of transmission of the light beam is switched to different micro-scanning mirrors (such as the first and second micro-scanning mirrors) during different periods (such as the first and second periods) to be guided to different The projection surfaces (such as the first and second projection surfaces) are scanned to form different images (such as the first and second images), so that multiple images can be projected on multiple projection surfaces without loss of image brightness.

The above and other objects, features and advantages of the present invention will become more apparent and understood.

For the sake of clarity, the various elements in the drawings are merely schematic and not drawn to scale and scale, and some of the conventional elements are omitted. In addition, in the different embodiments, the same or similar symbols represent the same or similar elements in order to present the consistency of the description of the present invention.

Please refer to FIG. 1 and FIG. 2 simultaneously. FIG. 1 and FIG. 2 are schematic diagrams showing the projection display device 1 according to an embodiment of the present invention scanning a plurality of projection surfaces to form a plurality of images during a plurality of periods. The projection display device 1 includes a light source module 10, a switch 20, and a plurality of micro-scanning mirrors. The light source module 10 provides a light beam L. The switch 20 receives the light beam L and switches the direction of transmission of the light beam L to the corresponding micro-scanning mirror in the micro-scanning mirrors during each of the plurality of periods. The micro-scanning mirrors scan the light beam L over a plurality of projection surfaces to form a plurality of images.

In this embodiment, the micro-scanning mirrors include a first micro-scanning mirror 30 and a second micro-scanning mirror 40, and the periods include a first period and a second period, the projection surfaces including the first projection surface S1 and the second The projection surface S2 includes the first image P1 and the second image P2. As shown in FIG. 1, the switch 20 switches the direction of transmission of the light beam L to the first micro-scanning mirror 30 during the first period, and the first micro-scanning mirror 30 scans the light beam L at the first projection surface S1 to form a first Image P1; as shown in FIG. 2, the switch 20 switches the direction of transmission of the light beam L to the second micro-scanning mirror 40 during the second period, and the second micro-scanning mirror 40 causes the light beam L to be scanned at the second projection surface S2. A second image P2 is formed. In one embodiment, the first period and the second period are very short, for example, each is 1/120 second, and the human eye may feel that the first image P1 and the second image P2 are simultaneously displayed.

In the embodiment, the light source module 10 includes a red light source 11 , a green light source 12 , a blue light source 13 , and an optical system 14 . The red light source 11, the green light source 12, and the blue light source 13 respectively provide a red sub-beam L1, a green sub-beam L2, and a blue sub-beam L3. The optical system 14 receives the red sub-beam L1, the green sub-beam L2, and the blue sub-beam L3, and combines the red sub-beam L1, the green sub-beam L2, and the blue sub-beam L3 into a beam L. In an embodiment, the red light source 11, the green light source 12, and the blue light source 13 adjust the light intensity of each of the red sub-beam L1, the green sub-beam L2, and the blue sub-beam L3 according to the image input signal, so that the synthesized beam L is finally The first image P1 and the second image P2 formed by scanning are color images. In one embodiment, the red light source 11 , the green light source 12 , and the blue light source 13 are both laser diodes or light emitting diodes (LEDs). However, the present embodiment is not intended to limit the present invention. For example, the light source module 10 can directly provide a light beam L by using a single color light source (such as a blue light source). The first image P1 and the second image P2 formed by the final scanning of the light beam L are Monochrome image or monochrome grayscale image.

In the present embodiment, the switch 20 includes a liquid crystal lens. The liquid crystal lens can change the arrangement direction of the liquid crystal molecules by changing the operating voltage to provide different refraction effects, thereby enabling the transfer direction of the light beam L to be switched to the first micro-scanning mirror 30 (as shown in FIG. 1) during the first period, and The direction of transmission of the light beam L is switched to the second micro-scanning mirror 40 during the second period (as shown in FIG. 2). The first micro-scanning mirror 30 and the second micro-scanning mirror 40 comprise a scanning mirror using micro-electro-mechanical systems (MEMS) technology, referred to as a MEMS mirror, with a dual-axis vector scan, which can be guided (eg by The way the light is reflected) is scanned on the projection surface to form a two-dimensional image.

In the present embodiment, the first projection surface S1 and the second projection surface S2 are separated. Correspondingly, the first image P1 and the second image P2 are separated. The content presented by the first image P1 and the second image P2 may be the same or different. In addition, the sizes of the first projection surface S1 and the second projection surface S2 (or the first image P1 and the second image P2) may be the same or different.

Please refer to FIG. 3. FIG. 3 is a schematic diagram of the first projection surface S1 and the second projection surface S2 being adjacent to each other according to an embodiment of the present invention. Correspondingly, the first image P1 and the second image P2 are adjacent to each other. The content presented by the first image P1 and the second image P2 may be the same or different. The content presented by the first image P1 and the second image P2 can also be combined into one complete content. However, this embodiment is not intended to limit the creation. For example, the first projection surface S1 and the second projection surface S2 may be adjacent to each other.

Please refer to FIG. 4. FIG. 4 is a schematic diagram showing the first projection surface S1 and the second projection surface S2 being staggered according to an embodiment of the present invention. Correspondingly, the first image P1 and the second image P2 are interlaced. The content presented by the first image P1 and the second image P2 is usually combined into one complete content. In an embodiment, the content presented by the first image P1 is odd line content in the complete content, and the content presented by the second image P2 is even line content in the complete content.

In an embodiment, the projection display device 1 is applied to a vehicle. The first micro-scanning mirror 30 (or the second micro-scanning mirror 40) can guide the light beam L to scan on the first projection surface S1 (or the second projection surface S2) on the windshield of the vehicle to form the first image P1. (or the second image P2), at this time, the first image P1 (or the second image P2) is a virtual image formed outside the windshield. In addition, the first micro-scanning mirror 30 (or the second micro-scanning mirror 40) can guide the light beam L to scan on the first projection surface S1 (or the second projection surface S2) on the inner surface of the roof of the vehicle to form the first An image P1 (or a second image P2), at which time the first image P1 (or the second image P2) is a real image formed on the inner surface of the roof, and can provide the driver or the passenger to adjust the seat to lie down and watch. In an embodiment, the first projection surface S1 and the second projection surface S2 are separated and are respectively located on the windshield of the vehicle, and the first image P1 and the second image P2 projected thereon are respectively provided for the driver and the passenger to watch. . In another embodiment, the first projection surface S1 and the second projection surface S2 are separated and respectively located on the windshield of the vehicle and the inner surface of the roof, and the first image P1 and the second image P2 projected thereon are respectively The driver and the passenger are provided for viewing, and the passenger needs to adjust the seat to lie down and watch.

Please refer to FIG. 5, FIG. 6 and FIG. 7. FIG. 5, FIG. 6 and FIG. 7 are diagrams showing that the projection display device 1' according to another embodiment of the present invention scans a plurality of projection surfaces for forming a plurality of periods. A schematic representation of the image. The projection display device 1' includes a light source module 10, a switch 20', and a plurality of micro-scanning mirrors. The light source module 10 provides a light beam L. The switch 20' receives the light beam L and switches the direction of transmission of the light beam L to the corresponding micro-scanning mirror in the micro-scanning mirrors during each of the plurality of periods. The micro-scanning mirrors scan the light beam L over a plurality of projection surfaces to form a plurality of images.

In this embodiment, the micro-scanning mirrors include a first micro-scanning mirror 30, a second micro-scanning mirror 40, and a third micro-scanning mirror 50. The periods include a first period, a second period, and a third period. The projection surface includes a first projection surface S1, a second projection surface S2, and a third projection surface S3. The images include a first image P1, a second image P2, and a third image P3. As shown in FIG. 5, the switch 20' switches the transmission direction of the light beam L to the first micro-scanning mirror 30 during the first period, and the first micro-scanning mirror 30 causes the light beam L to be scanned at the first projection surface S1 to form the first An image P1; as shown in FIG. 6, the switch 20' switches the direction of transmission of the light beam L to the second micro-scanning mirror 40 during the second period, and the second micro-scanning mirror 40 causes the light beam L to be performed at the second projection surface S2. Scanning to form a second image P2; as shown in FIG. 7, the switch 20' switches the direction of transmission of the light beam L to the third micro-scanning mirror 50 during the third period, and the third micro-scanning mirror 50 causes the light beam L to be in the third The projection surface S3 is scanned to form a third image P3. In one embodiment, the first period, the second period, and the third period are very short, for example, each is 1/180 second, and the human eye may feel that the first image P1 and the second image P2 are simultaneously displayed.

In summary, by switching devices (such as liquid crystal lenses), the direction of transmission of the light beam is switched to different micro-scanning mirrors at different periods and is guided to different projection surfaces for scanning to form different images, so that multiple Projection surfaces project multiple images without loss of image brightness.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of protection is subject to the definition of the scope of the attached patent application.

1, 1'‧‧‧ projection display device
10‧‧‧Light source module
11‧‧‧Red light source
12‧‧‧Green light source
13‧‧‧Blue light source
14‧‧‧Optical system
20, 20'‧‧‧Switch
30‧‧‧First micro scanning mirror
40‧‧‧Second micro scanning mirror
50‧‧‧ Third micro scanning mirror
L‧‧‧beam
L1‧‧‧Red sub-beam
L2‧‧‧Green sub-beam
L3‧‧‧Blue sub-beam
S1‧‧‧ first projection surface
S2‧‧‧second projection surface
S3‧‧‧ third projection surface
P1‧‧‧ first image
P2‧‧‧Second image
P3‧‧‧ third image

1 is a schematic diagram of a projection display apparatus according to an embodiment of the present invention scanning a first projection surface during a first period; FIG. 2 is a projection display apparatus according to an embodiment of the present invention performed on a second projection surface during a second period. FIG. 3 is a schematic diagram of a first projection surface and a second projection surface adjacent to each other according to an embodiment of the present invention; FIG. 4 is a first projection surface and a second projection surface according to an embodiment of the present invention; FIG. 5 is a schematic diagram of a projection display apparatus according to another embodiment of the present invention scanning at a first projection surface during a first period; FIG. 6 is a projection display apparatus according to another embodiment of the present invention during a second period; A schematic diagram of scanning at a second projection surface; and FIG. 7 is a schematic diagram of scanning of a projection display device according to another embodiment of the present invention on a third projection surface during a third period.

Claims (7)

A projection display device includes a light source module, a switcher and a plurality of micro-scanning mirrors; wherein the light source module provides a light beam; the switch receives the light beam and will be used during each of the plurality of periods The direction of transmission of the beam is switched to a corresponding one of the micro-scanning mirrors; the micro-scanning mirrors scan the beam on a plurality of projection surfaces to form a plurality of images. The projection display device of claim 1, wherein the micro-scanning mirror comprises a first micro-scanning mirror and a second micro-scanning mirror, the periods including a first period and a second period, The projection surface includes a first projection surface and a second projection surface, the images include a first image and a second image; the switch switches the transmission direction of the light beam to the first in the first period a micro-scanning mirror that scans the light beam on the first projection surface to form the first image; the switch switches the direction of transmission of the light beam to the second micro-scan during the second period a second micro-scanning mirror that scans the light beam on the second projection surface to form the second image. The projection display device of claim 1, wherein the light source module comprises a plurality of light sources and an optical system, wherein the light sources provide a plurality of sub-beams of different colors; the optical system receives the sub-beams And combining the sub-beams into the beam. The projection display device of claim 1, wherein the switch comprises a liquid crystal lens. The projection display device of claim 1, wherein the projection surfaces are separated, adjacent or staggered. The projection display device of claim 1, wherein the projection display device is applied to a vehicle. The projection display device of claim 6, wherein the projection surfaces are located on a windshield and/or a roof surface of the vehicle.