Off-axis double-mirror focusing backlight display device and head-up display device thereof

Abstract

The invention provides an off-axis double-mirror focusing backlight display device which comprises a light-emitting array composed of a plurality of light-emitting sources and providing a backlight source; the conical light cup array is composed of a plurality of conical light cups, the light emitting arrays are located on the light incident sides of the conical light cup array respectively, the light emitting sources correspond to the conical light cups respectively, and the conical light cup array is used for amplifying the backlight source and reducing the diffusion angle of the backlight source; the diffusion sheet is arranged on the light emitting side of the conical light cup array and is used for increasing the uniformity of the backlight source; the first curved mirror is used for receiving and reflecting the backlight source; the second curved mirror is used for receiving and reflecting the backlight source reflected by the first curved mirror; the display module is used for receiving the backlight source reflected by the second curved mirror; at least one of the first curved mirror and the second curved mirror is a concave mirror.

Description

Technical Field

[0001] The invention relates to a backlight display device, in particular to an off-axis double-mirror focusing backlight display device.

[0002] The present invention also relates to a head-up display device having an off-axis dual-mirror focusing backlight display device. Background Art

[0003] Prior art such as CN102777803A and CN102812289B disclose a lighting device or lighting system. The above lighting devices all use a conical light cup (such as the collimator 12 disclosed in CN102812289B). Although the above conical light cup can enlarge the area of ​​the light source and reduce the diffusion angle of the light source to efficiently generate a desired or predetermined light distribution pattern in the target area, the above lighting system using the conical light cup is mostly used in automobile headlight lighting, studio lighting, theater lighting, building lighting, etc.

[0004] If the conical light cup is to be applied to a backlight display device or a head-up display device, the problem of light diffusion angle and the technical problem of how to completely cover the display module with the projected light will be faced. Summary of the invention

[0005] The present invention provides an off-axis dual-mirror focusing backlight display device, the main purpose of which is to diffuse the light projected from a conical light cup array at different tilt angles and make the diffusion angle of the light completely cover the display module.

[0006] The present invention also provides a head-up display device with an off-axis dual-mirror focusing backlight display device, the main purpose of which is to position the real image eye box formed by the backlight source inside the windshield.

[0007] To achieve the above-mentioned object, the off-axis dual-mirror focusing backlight display device of the present invention comprises:

[0008] A light array, composed of a plurality of light sources, the light array provides a backlight source;

[0009] A conical light cup array, which is composed of a plurality of conical light cups. The light-emitting arrays are located on the light-incident side of the conical light cup arrays. Each light source corresponds to a conical light cup. The conical light cup array is used to amplify the backlight source and reduce the diffusion angle of the light source.

[0010] A diffuser, disposed on the light-emitting side of the conical light cup array, the diffuser is used to increase the uniformity of the backlight source;

[0011] a first curved mirror, for receiving and reflecting the backlight source;

[0012] a second curved mirror, for receiving and reflecting the backlight source reflected by the first curved mirror;

[0013] a display module for receiving a backlight source reflected by the second curved mirror; and

[0014] At least one of the first curved mirror and the second curved mirror is a concave mirror.

[0015] As can be seen from the foregoing, the present invention mainly places the light source on the light incident side of the conical light cup arrays and the diffuser is disposed on the light emitting side of the conical light cup arrays so that the light projected by each conical light cup can completely cover the display module.

[0016] The present invention further provides a head-up display device having an off-axis dual-mirror focusing backlight display device, which further comprises:

[0017] A windshield and an imaging concave mirror, wherein the imaging concave mirror is used to reflect an 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 a driver's eye box position;

[0018] The display module is arranged within the focal length of the imaging concave mirror, the equivalent distance of the backlight source 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 eye box formed by the backlight source is inside the windshield.

[0019] From the foregoing, it can be seen that the present invention is mainly based on setting the display module within the focal length of the imaging concave mirror, the equivalent distance of the backlight source 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 driving eye box formed by the backlight source is located inside the windshield. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. 4 is a schematic diagram of a tapered light cup array of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the off-axis dual-mirror focusing backlight display device of the present invention.

[0022] Figure 3 FIG. 4 is a schematic diagram of another embodiment of a tapered light cup array of the present invention.

[0023] Figure 4 FIG. 4 is a schematic diagram of another embodiment of a tapered light cup array of the present invention.

[0024] Figure 5 FIG. 1 is a schematic diagram of an embodiment of a backlight source of the present invention.

[0025] Figure 6 FIG. 4 is a schematic diagram of another embodiment of a backlight source of the present invention.

[0026] Figure 7FIG. 4 is a schematic diagram of another embodiment of a backlight source of the present invention.

[0027] Figure 8 This is a schematic diagram of the architecture of the head-up display device of the present invention.

[0028] Fig. 9 FIG. 2 is a schematic diagram of the structure of another embodiment of the head-up display device of the present invention.

[0029] Fig.10 FIG. 2 is a schematic diagram of the structure of another embodiment of the head-up display device of the present invention.

[0030] Fig.11 FIG. 2 is a schematic diagram of the structure of another embodiment of the head-up display device of the present invention.

[0031] Among them, 0-aluminum substrate 0; 1-light-emitting array; 11-light source; 2-conical light cup array; 21-conical light cup; 22-light-entering side; 23-light-exiting side; 3-diffuser; 31-light-entering side; 32-light-exiting side; 4-first curved mirror; 5-second curved mirror; 6-display module; 7-convex lens array; 8-imaging concave mirror; 9-windshield; B, B1, B2-backlight source; L-light; D-image light source; E-driving eye box position; I-virtual image. DETAILED DESCRIPTION

[0032] The off-axis dual-mirror focusing backlight display device of the present invention is described in an embodiment. Figure 1-7 As shown, it contains:

[0033] A light array 1, composed of a plurality of light sources 11, the light array 1 provides a backlight source B. In this embodiment, the light array 1 is an LED array, and the light array 1 is disposed on an aluminum substrate 0;

[0034] A conical light cup array 2, composed of a plurality of conical light cups 21, each light source 11 corresponds to a conical light cup 21, the conical light cups 21 are hollow light cups coated with a high reflectivity coating or transparent solid light cups, the conical light cups 21 use the high refractive index cup wall to generate total reflection, the light array 1 is arranged on the light incident side 22 of the conical light cup array 2, the conical light cup array 2 is used to amplify the backlight source B to reduce the angle of light source diffusion;

[0035] A diffuser 3, disposed on the light-emitting side 23 of the conical light cup array 2, the diffuser 3 is used to increase the uniformity of the backlight source B;

[0036] A first curved mirror 4 is a free-form mirror, and the first curved mirror 4 is used to receive and reflect the backlight source B;

[0037] a second curved mirror 5, which is a free-curved mirror, and is used to receive and reflect the backlight source B reflected by the first curved mirror 4;

[0038] a display module 6 for receiving the backlight reflected by the second curved mirror 5. In this embodiment, the display module 6 is a TFT panel;

[0039] In this embodiment, at least one of the first curved mirror 4 and the second curved mirror 5 is a concave mirror, and the concave mirror is used to magnify and distance the backlight source B;

[0040] Please refer to Figure 3 As shown, the inclinations of the conical light cups 21 are different. The inclination of the conical light cups 21 gradually decreases from the two sides of the conical light cup array 2 to the center. The conical light cups 21 are inclined toward the center of the conical light cup array 2. The diffuser 3 is a curved sheet. The light L at the outlet of each conical light cup 21 completely covers the entire display module 6. It is worth mentioning that Figure 3 The first curved mirror 4 and the second curved mirror 5 are particularly omitted.

[0041] In a preferred embodiment, please refer to Figure 4 As shown, it also includes a convex lens array 7. The diffuser 3 is a flat sheet. The convex lens array 7 includes multiple convex lenses. The convex lens array 7 is arranged on a light-emitting side 32 of the diffuser 3, so that the diffuser 3 is located between the convex lens array 7 and the conical light cup array 2. The light-emitting side 23 of the conical light cup array 2 faces the light-entering side 31 of the diffuser 3. In this embodiment, the conical openings of the conical light cups 21 are used to enlarge the area of ​​the light source and reduce the diffusion angle of the light source. The conical light cups 21 can make the light sources closer, and the diffuser 3 can increase the uniformity of the light, but the diffusion angle of the light will increase. Therefore, the convex lens array 7 can reduce the diffusion angle of the light to the required angle again.

[0042] In a preferred embodiment, please refer to Figure 5 As shown, the light array 1 is used as the backlight source B. The light L generated by the light array 1 leaves the outlet of the conical light cup 21 and is projected onto the first curved mirror 4 and the second curved mirror 5. The first curved mirror 4 is a concave mirror to magnify and distance the backlight source B1, and the second curved mirror 5 is a concave mirror to further magnify and distance the backlight source B2. The light L is reflected from the second curved mirror 5 and penetrates the display module 6 to project an image light source D on the display module 6.

[0043] In a preferred embodiment, please refer to Figure 6As shown, the light array 1 is used as the backlight source B. The light L generated by the light array 1 leaves the outlet of the conical light cup 21 and is projected onto the first curved mirror 4 and the second curved mirror 5. The first curved mirror 4 is a concave mirror to magnify and distance the backlight source B1, while the second curved mirror 5 is a convex mirror to reduce and bring the backlight source B2 closer. The light L is reflected from the second curved mirror 5 and then penetrates the display module 6 to project the image light source D on the display module 6.

[0044] In a preferred embodiment, please refer to Figure 7 As shown, the light array 1 is used as the backlight source B. The light L generated by the light array 1 leaves the outlet of the conical light cup 21 and is projected onto the first curved mirror 4 and the second curved mirror 5. The first curved mirror 4 is a convex mirror to reduce and bring the backlight source B1 closer, and the second curved mirror 5 is a concave mirror to magnify and move the backlight source B2 away. After being reflected from the second curved mirror 5, the light L penetrates the display module 6 to project the image light source D on the display module 6.

[0045] The present invention has a head-up display device with an off-axis dual-mirror focusing backlight display device. In one embodiment, please refer to Figure 8 As shown, it also includes:

[0046] A windshield 9 is provided for reflecting the image light source D projected from the display module 6 to form an image at a driver's eye box position E. The windshield 9 is a head-up display device. To further explain, the windshield 9 reflects the image light source D of the display module 6 to form a virtual image I, and the backlight source B forms a real image due to passing through the first curved mirror 4 and the second curved mirror 5, which is reflected by the windshield 9 to form an image at the driver's eye box position E.

[0047] In another embodiment, please refer to Fig. 9 As shown, an imaging concave mirror 8 is further provided between the display module 6 and the windshield 9. 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 penetrating from the display module 6 to the windshield 9. The windshield 9 is used to reflect the image light source D and form an image at the driving eye box position E. The display module 6 is arranged within the focal length of the imaging concave mirror 8. The backlight source B is at an equivalent distance (please refer to Figure 5 ) is greater than the focal length of the imaging concave mirror 8, the virtual image I formed by the display module 6 is located outside the windshield 9, and the backlight source B forms a driving eye box position E inside the windshield 9.

[0048] In another embodiment, please refer to Fig.10As shown, an imaging concave mirror 8 is further provided between the display module 6 and the windshield 9, the first curved mirror 4 is a concave mirror, the second curved mirror 5 is a convex mirror, the imaging concave mirror 8 is used to reflect the image light source D penetrating from the display module 6 to the windshield 9, and the windshield 9 is used to reflect the image light source D and form an image at the driver's eye box position E. The display module 6 is arranged within the focal length of the imaging concave mirror 8, and the backlight source B is at an equivalent distance (please refer to Figure 6 ) is greater than the focal length of the imaging concave mirror 8, the virtual image I formed by the display module 6 is located outside the windshield 9, and the backlight source B forms a driving eye box position E inside the windshield 9.

[0049] In another embodiment, please refer to Fig.11 As shown, an imaging concave mirror 8 is further provided between the display module 6 and the windshield 9, the first curved mirror 4 is a convex mirror, the second curved mirror 5 is a concave mirror, the imaging concave mirror 8 is used to reflect the image light source D penetrating from the display module 6 to the windshield 9, and the windshield 9 is used to reflect the image light source D and form an image at the driver's eye box position E. The display module 6 is set within the focal length of the imaging concave mirror 8, and the backlight source B is at an equivalent distance (please refer to Figure 7 ) is greater than the focal length of the imaging concave mirror 8, the virtual image I formed by the display module 6 is located outside the windshield 9, and the driving eye box position E formed by the backlight source B is located inside the windshield 9.

Claims

1. An off-axis dual-mirror focusing backlight display device, characterized in that: include: A light array, composed of a plurality of light sources, the light array provides a backlight source; A conical light cup array, composed of a plurality of conical light cups, the light-emitting array is located on the light-incident side of the conical light cup array, each light source corresponds to a conical light cup, and the conical light cup array is used to amplify the backlight source and reduce the diffusion angle of the backlight source; A diffuser, disposed on the light-emitting side of the conical light cup array, the diffuser is used to increase the uniformity of the backlight source; a first curved mirror, for receiving and reflecting the backlight source; a second curved mirror, for receiving and reflecting the backlight source reflected by the first curved mirror; a display module, configured to receive the backlight source reflected by the second curved mirror; as well as At least one of the first curved mirror and the second curved mirror is a concave mirror, and the concave mirror is used to magnify and distance the backlight source.

2. The off-axis dual-mirror focusing backlight display device according to claim 1, characterized in that: The conical light cups are hollow light cups coated with a high reflectivity coating or transparent solid light cups.

3. The off-axis dual-mirror focusing backlight display device according to claim 1, characterized in that: 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 focusing backlight display device according to claim 1, characterized in that: The conical light cups of the conical light cup array have different inclinations.

5. The off-axis dual-mirror focusing backlight display device according to claim 1, characterized in that: The diffusion sheet is a curved sheet or a flat sheet.

6. The off-axis dual-mirror focusing backlight display device according to claim 1, characterized in that: It also includes a convex lens array. The diffuser is a flat sheet. The convex lens array includes a plurality of convex lenses. The convex lens array is arranged on the light-emitting side of the diffuser. The diffuser is located between the convex lens array and the conical light cup array.

7. A head-up display device comprising the off-axis dual-mirror focusing backlight display device according to any one of claims 1 to 6, characterized in that: The device further comprises a windshield, and the windshield is used to reflect an image light source projected by the display module.

8. The head-up display device according to claim 7, characterized in that: The image light source projected by the display module reflected by the windshield is a virtual image, and the backlight source forms a real image through the first curved mirror and the second curved mirror, which is reflected by the windshield and formed at a driver's eye box position.

9. A head-up display device comprising the off-axis dual-mirror focusing backlight display device according to any one of claims 1 to 6, characterized in that: The device further comprises a windshield and an imaging concave mirror. The imaging concave mirror is used to reflect an 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 a driving eye box position.

10. The head-up display device according to claim 9, characterized in that: The display module is arranged within the focal length of the imaging concave mirror, the equivalent distance of the backlight source 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 driving eye box formed by the backlight source is located inside the windshield.

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