Off-axis dual mirror light-collecting backlight display device and head-up display thereof

Abstract

To provide an off-axis dual mirror focusing backlight display device.SOLUTION: An off-axis dual mirror focusing backlight display device comprises: a light emitting array 1 that includes a plurality of light sources and provides backlight; a tapered light cup array 2 that includes a plurality of tapered light cups, and is located on an incoming light side of the tapered light cup array, wherein each of the light sources corresponds to one of the tapered light cups, and the tapered light cup array is used to magnify the backlight to reduce the diffusion angle of the backlight; a diffusion sheet 3 that is installed on an outgoing light side of the tapered light cup array, and is used to increase uniformity of the backlight; a first curved mirror 4 for receiving and reflecting the backlight; a second curved mirror 5 for receiving and reflecting the backlight reflected by the first curved mirror; and a display module 6 for receiving the backlight reflected by the second curved mirror. At least one of the first curved mirror and the second curved mirror is a concave mirror.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a backlight display device, more particularly to an off-axis dual-mirror focused backlight display device. The present invention further relates to a head-up display of the off-axis dual-mirror focused backlight display device. [Background technology]

[0002] For example, Patent Documents 1 and 2 disclose lighting devices or lighting systems. All of the above illumination devices use a tapered light cup (see, for example, collimator 12 in Patent Document 2). The tapered light cup described above increases the area of ​​the light source and reduces the light source's angular spread, efficiently producing a desired or predefined light distribution pattern at a target area. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] China Patent Application Publication No. 102777803A [Patent Document 2] Chinese Patent Application Publication No. 102812289B Summary of the Invention [Problem to be solved by the invention]

[0004] However, many of the lighting systems that utilize the tapered light cups described above are used in automotive headlight lighting, office and theater lighting, architectural lighting, and the like. When the tapered light cup is applied to a backlight display device or a head-up display, it faces the problem of the light divergence angle and the technical problem of how to completely cover the display module with the projected light.

[0005] Therefore, the present inventors believed that the above-mentioned drawbacks could be improved, and as a result of extensive research, they came to propose the present invention, which effectively improves the above-mentioned problems through rational design.

[0006] In view of the above-mentioned conventional situation, the present invention provides an off-axis dual mirror concentrating backlight display device, the purpose of which is to diffuse the light beam projected from the tapered light cup array with different gradients, so that the diffusion angle of the light beam completely covers the display module. The present invention also provides a head-up display of the off-axis dual mirror concentrating backlight display device, the purpose of which is to arrange the eyebox position of the real image formed by the backlight inside the windshield. [Means for solving the problem]

[0007] In order to solve the above problems, an off-axis dual mirror light collecting backlight display device according to one embodiment of the present invention comprises: a light emitting array comprising a plurality of light sources, the light emitting array providing a backlight; A tapered light cup array composed of a plurality of tapered light cups, the light emitting array is located on the light incident side of the tapered light cup array, each of the light sources corresponds to one of the tapered light cups, and the tapered light cup array is used to expand the backlight and reduce the angle at which the backlight spreads; a diffusion sheet disposed on the light output side of the tapered light cup array, the diffusion sheet being used to enhance the uniformity of the backlight; a first curved mirror for receiving and reflecting the backlight; a second curved mirror for receiving and reflecting the backlight reflected from the first curved mirror; a display module for receiving the backlight reflected from the second curved mirror; Equipped with At least one of the first curved mirror and the second curved mirror is a concave mirror. do.

[0008] As can be seen from the above, the present invention mainly focuses on positioning a light source on the light input side of the tapered light cup array and installing a diffusion sheet on the light output side of the tapered light cup array, so that the light beams projected from each of the tapered light cups completely cover the display module.

[0009] In order to achieve the above object, an off-axis dual mirror light-collecting backlight display device and its head-up display according to another embodiment of the present invention further comprises a windshield and an imaging concave mirror, the imaging concave mirror is used to reflect the image light source projected by the display module to the windshield, and the windshield is used to reflect the image light source to form an image at the driver's eyebox position. The display module is installed within the focal length of the imaging concave mirror, the equivalent distance of the backlight is greater than the focal length of the imaging concave mirror, the virtual image formed by the display module is located outside the windshield, and the eyebox formed by the backlight is located inside the windshield. Effect of the Invention

[0010] As can be seen from the above, the present invention mainly relates to the display module being installed within the focal length of the imaging concave mirror, the equivalent distance of the backlight being greater than the focal length of the imaging concave mirror, the virtual image formed by the display module being located outside the windshield, and the driver's eyebox position formed by the backlight being located within the windshield.

[0011] Other features of the present invention will become apparent from the following detailed description of the present invention and the accompanying drawings. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram showing a tapered light cup array according to an embodiment of the present invention. [Diagram 2] 1 is a schematic diagram showing a configuration of an off-axis dual mirror focusing backlight display device according to an embodiment of the present invention. [Diagram 3] FIG. 13 is a schematic diagram showing a tapered light cup array according to another embodiment of the present invention. [Figure 4] FIG. 13 is a schematic diagram showing a tapered light cup array according to yet another embodiment of the present invention. [Diagram 5] 1 is a schematic diagram showing a backlight according to an embodiment of the present invention; [Figure 6] FIG. 13 is a schematic diagram showing a backlight according to another embodiment of the present invention. [Figure 7] FIG. 13 is a schematic diagram showing a backlight according to yet another embodiment of the present invention. [Figure 8] 1 is a schematic diagram showing a configuration of a head-up display according to an embodiment of the present invention. [Figure 9] FIG. 11 is a schematic diagram showing a configuration of a head-up display according to another embodiment of the present invention. [Figure 10] FIG. 11 is a schematic diagram showing a configuration of a head-up display according to still another embodiment of the present invention. [Figure 11] FIG. 11 is a schematic diagram showing a configuration of a head-up display according to still another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. It goes without saying that the present invention is not limited to the following examples, and can be modified as desired without departing from the gist of the present invention.

[0014] An off-axis dual mirror light collecting backlight display device according to the present invention will be described with reference to Figures 1 to 7. The display device mainly includes the following components, each of which will be described below.

[0015] <Light emitting array 1> The light-emitting array 1 is composed of a plurality of light sources 11. The light-emitting array 1 provides a backlight B. In this embodiment, the light emitting array 1 is an LED array, and the light emitting array 1 is mounted on an aluminum substrate 0 .

[0016] <Tapered Light Cup Array 2> Each of the light sources 11 comprises a number of tapered light cups 21 . Each of the light sources 11 corresponds to one of the tapered light cups 21 . These tapered light cups 21 are either hollow light cups plated with a highly reflective coating or transparent solid light cups. These tapered light cups 21 generate total internal reflection due to the high refractive index of the cup walls. The light emitting array 1 is disposed on the light incident side 22 of the tapered light cup array 2 . The tapered light cup array 2 is used to magnify the backlight B and reduce the angle over which the light source spreads.

[0017] <Diffusion sheet 3> The diffusion sheet 3 is disposed on the light exit side 23 of the tapered light cup array 2 . The diffusion sheet 3 is used to improve the uniformity of the backlight B.

[0018] <First curved mirror 4> The first curved mirror 4 is a free curved mirror. The first curved mirror 4 is used to receive and reflect the backlight B.

[0019] <Second curved mirror 5> The second curved mirror 5 is a free curved mirror. The second curved mirror 5 is used to receive and reflect the backlight B reflected from the first curved mirror 4 .

[0020] <Display module 6> The display module 6 is used to receive the backlight reflected from the second curved mirror 5 . In this embodiment, the display module 6 is a TFT panel.

[0021] In this embodiment, at least one of the first curved mirror 4 and the second curved mirror 5 is a concave mirror. The concave mirror is used to magnify the backlight B and zoom out.

[0022] As shown in FIG. 3, the slopes of the tapered light cups 21 are different. The degree of inclination of the tapered light cups 21 gradually decreases from both sides to the center of the tapered light cup array 2 , and the tapered light cups 21 are inclined toward the center of the tapered light cup array 2 . The diffusion sheet 3 is a curved sheet, and the light beam L from each outlet of the tapered light cups 21 completely covers the entire display module 6 . Incidentally, the first curved mirror 4 and the second curved mirror 5 are not particularly shown in FIG.

[0023] In a preferred embodiment, as shown in FIG. The diffusion sheet 3 is a flat sheet. The convex lens array 7 includes a plurality of convex lenses. The convex lens array 7 is disposed on the light exit side 32 of the diffusion sheet 3 . The diffusion sheet 3 is located between the convex lens array 7 and the tapered light cup array 2 . The light exit side 23 of the tapered light cup array 2 faces a light entrance side 31 of the diffusion sheet 3 . In this embodiment, the cone openings of the tapered light cups 21 increase the area of ​​the light source and reduce the diffusion angle of the light source, and the tapered light cups 21 bring the light source closer together, while the diffusion sheet 3 increases the diffusion angle of the light rays while improving the uniformity of the light. The convex lens array 7 then reduces the divergence angle of the light rays again to the desired angle.

[0024] In a preferred embodiment, the light-emitting array 1 is a backlight B, as shown in FIG. A light beam L generated by the light emitting array 1 is projected onto the first curved mirror 4 and the second curved mirror 5 after leaving the outlet of the tapered light cup 21 . The first curved mirror 4 is a concave mirror that magnifies and zooms out the backlight B1. The second curved mirror 5 is a concave mirror that further magnifies and zooms out the backlight B2. The light ray L is reflected from the second curved mirror 5 and then passes through the display module 6 , and an image light source D is projected onto the display module 6 .

[0025] In a preferred embodiment, the light-emitting array 1 is a backlight B, as shown in FIG. A light beam L generated by the light emitting array 1 is projected onto the first curved mirror 4 and the second curved mirror 5 after leaving the outlet of the tapered light cup 21 . The first curved mirror 4 is a concave mirror that magnifies and zooms out the backlight B1. The second curved mirror 5 is a convex mirror that reduces and zooms in the backlight B2. The light ray L is reflected from the second curved mirror 5 and then passes through the display module 6 , and the image light source D is projected onto the display module 6 .

[0026] In a preferred embodiment, the light-emitting array 1 is a backlight B, as shown in FIG. A light beam L generated by the light emitting array 1 is projected onto the first curved mirror 4 and the second curved mirror 5 after leaving the outlet of the tapered light cup 21 . The first curved mirror 4 is a convex mirror that reduces and zooms in the backlight B1. The second curved mirror 5 is a concave mirror that magnifies and zooms the out backlight B2. The light ray L is reflected from the second curved mirror 5 and then passes through the display module 6 , and the image light source D is projected onto the display module 6 .

[0027] Next, with reference to FIG. 8, a head-up display of an off-axis dual mirror light collecting type backlight display device according to one embodiment of the present invention will be described. The head-up display of the off-axis dual mirror light collecting backlight display device according to the present invention mainly comprises a windshield 9 .

[0028] The windshield 9 is used to reflect the image light source D projected from the display module 6 to an imaging driver's eyebox position E. The windshield 9 is a head-up display, more specifically, the windshield 9 reflects an image light source D of the display module 6 as a virtual image I. Backlight B is focused as a real image by first curved mirror 4 and second curved mirror 5, and is reflected by the windshield 9 to be focused at eyebox position E of the driver.

[0029] In another preferred embodiment, an imaging concave mirror 8 is further installed between the display module 6 and the windshield 9, as shown in FIG. The first curved mirror 4 and the second curved mirror 5 are both concave mirrors. The imaging concave mirror 8 is used to reflect the image light source D transmitted from the display module 6 onto the windshield 9 . The windshield 9 is used to reflect the image light source D and focus it on the eyebox position E of the driver. The display module 6 is placed within the focal length of the imaging concave mirror 8 . The equivalent distance of the backlight B (see FIG. 5) is greater than the focal length of the imaging concave mirror 8 . A virtual image I formed by the display module 6 is located outside the windshield 9 , and a driver's eyebox position E formed by the backlight B is located inside the windshield 9 .

[0030] In another preferred embodiment, an imaging concave mirror 8 is further installed between the display module 6 and the windshield 9, as shown in FIG. The first curved mirror 4 is a concave mirror, and the second curved mirror 5 is a convex mirror. The imaging concave mirror 8 is used to reflect the image light source D transmitted from the display module 6 onto the windshield 9 . The windshield 9 is used to reflect the image light source D and focus the image at the eyebox position E of the driver. The display module 6 is placed within the focal length of the imaging concave mirror 8 . The equivalent distance of the backlight B (see FIG. 6) is greater than the focal length of the imaging concave mirror 8 . A virtual image I formed by the display module 6 is located outside the windshield 9 , and a driver's eyebox position E formed by the backlight B is located inside the windshield 9 .

[0031] In another preferred embodiment, an imaging concave mirror 8 is further installed between the display module 6 and the windshield 9, as shown in FIG. The first curved mirror 4 is a convex mirror, and the second curved mirror 5 is a concave mirror. The imaging concave mirror 8 is used to reflect the image light source D transmitted from the display module 6 onto the windshield 9 . The windshield 9 is used to reflect the image light source D and focus the image at the eyebox position E of the driver. The display module 6 is placed within the focal length of the imaging concave mirror 8 , and the equivalent distance of the backlight B (see FIG. 7) is greater than the focal length of the imaging concave mirror 8 . A virtual image I formed by the display module 6 is located outside the windshield 9 , and a driver's eyebox position E formed by the backlight B is located inside the windshield 9 .

[0032] Although the present invention has been described above, the technical scope of the present invention is not limited to the above-mentioned embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above-described embodiment. It will also be apparent to one skilled in the art that such modifications or improvements can be made. Furthermore, it is apparent from the description of the claims that such modified or improved forms may also be included within the technical scope of the present invention. [Explanation of symbols]

[0033] 0 Aluminum Substrate 1. Light emitting array 11 Light source 2 Tapered Light Cup Array 21 Tapered Light Cup 22 Light incidence side 23 Light output side 3 Diffusion Sheet 31 Light incidence side 32 Light output side 4. First curved mirror 5. Second curved mirror 6 Display Module 7 Convex Lens Array 8 Imaging concave mirror 9. Windshield B. Backlight B1 Backlight B2 Backlight L Ray D Image Light Source E Driver eye box position I Virtual Image

Claims

1. a light emitting array comprising a plurality of light sources, the light emitting array providing a backlight; A tapered light cup array composed of a plurality of tapered light cups, the light emitting array is located on the light incident side of the tapered light cup array, each of the light sources corresponds to one of the tapered light cups, and the tapered light cup array is used to expand the backlight and reduce the angle at which the backlight spreads; a diffusion sheet disposed on the light output side of the tapered light cup array, the diffusion sheet being used to enhance the uniformity of the backlight; a first curved mirror for receiving and reflecting the backlight; a second curved mirror for receiving and reflecting the backlight reflected from the first curved mirror; a display module for receiving the backlight reflected from the second curved mirror; At least one of the first curved mirror and the second curved mirror is a concave mirror, and the concave mirror is at least one concave mirror used to magnify and zoom out the backlight.

2. 2. The off-axis dual mirror light-collecting backlight display device according to claim 1, wherein the tapered light cup is a hollow light cup plated with a high reflectance coating film or a transparent solid light cup.

3. 2. The off-axis dual mirror light-collecting backlight display device according to claim 1, wherein one of the first curved mirror and the second curved mirror is a concave mirror, and the other is a concave mirror or a convex mirror.

4. The off-axis dual mirror concentrating backlight display of claim 1 , wherein the slopes of the tapered light cups of the tapered light cup array are different.

5. 2. The off-axis dual mirror light-collecting backlight display device according to claim 1, wherein the diffusion sheet is a curved sheet or a flat sheet.

6. 2. The off-axis dual mirror focusing backlight display device of claim 1, further comprising a convex lens array, the diffusion sheet being a planar sheet body, the convex lens array including a plurality of convex lenses, the convex lens array being disposed on the light output side of the diffusion sheet, and the diffusion sheet being positioned between the convex lens array and the tapered light cup array.

7. A head-up display comprising the off-axis dual mirror focusing backlight display device according to any one of claims 1 to 6, A head-up display further comprising a windshield for reflecting an image light source projected from the display module.

8. 8. The head-up display according to claim 7, wherein the windshield reflects the image light source projected from the display module as a virtual image, the backlight forms a real image by a first curved mirror and a second curved mirror, and the real image is reflected by the windshield to form an image at the driver's eyebox position.

9. A head-up display comprising the off-axis dual mirror focusing backlight display device according to any one of claims 1 to 6, a windshield and an imaging concave mirror; the imaging concave mirror is used to reflect an image light source projected by the display module onto the windshield; A head-up display, characterized in that the windshield is used to reflect the image light source and form an image at the driver's eyebox position.

10. 10. The head-up display of claim 9, wherein the display module is installed within a focal length of the imaging concave mirror, the equivalent distance of the backlight is greater than the focal length of the imaging concave mirror, a virtual image formed by the display module is located outside the windshield, and the driver's eyebox position formed by the backlight is located inside the windshield.

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