TW202343106A - Projection display apparatus and vehicle having the same - Google Patents

Abstract

A projection display apparatus and a vehicle having the same is disclosed. The projection display apparatus includes a light source board, a parabolic plano-convex lens module, a spherical lenticular lens, a liquid crystal display module and a reflector. The light source board has a plurality of light sources. The parabolic plano-convex lens module has a plurality of parabolic plano-convex lenses. The planes of the parabolic plano-convex lenses face the light-emitting sides of the light sources respectively. The spherical lenticular lens and the light source board are respectively located on opposite sides of the parabolic plano-convex lens module. The liquid crystal display module and the parabolic plano-convex lens module are respectively located on opposite sides of the spherical lenticular lens. The light of the light source passes through the parabolic plano-convex lens, the spherical lenticular lens and the liquid crystal display module to form imaging light. The reflector, located on the optical path of the imaging light, reflects the imaging light to a transparent substrate, thereby producing a virtual image with high uniformity and high brightness.

Description

Projection display device and vehicle equipped with the same

The present invention relates to a display technology, and in particular to a projection display device and a vehicle equipped with the same.

Head-up display technology is a display technology commonly used on aircraft. Head-up display means that the pilot can see the important information he needs without having to lower his head. Head-up displays first appeared on military aircraft to reduce the frequency with which pilots need to lower their heads to check instruments, avoiding interruptions in concentration and loss of situation awareness (Situation Awareness). Because heads-up displays can improve flight safety and display convenience, they are gradually being widely used in civil aviation aircraft. Currently, international and domestic efforts are vigorously developing vehicle head-up display systems. The use of vehicle-mounted head-up display systems to display environmental information around the car can effectively improve the safety performance of car driving.

The Picture Generation Unit (PGU) plays a role in the overall head-up display system as a device that provides images and light sources. The PGU has a thin film transistor liquid crystal display (TFT LCD) screen that can output various types of images to provide drivers with more diverse information and enhance the driving experience. The other is the backlight module, which provides the light source for the LCD screen. Mainly, brightness and screen brightness uniformity are the main evaluation mechanisms. Because of the high uniformity of the picture, traditional PGU uses a direct-type multiple light-emitting diode array to emit light. Although it achieves better uniformity, the overall power consumption is considerable, and the direct use of light-emitting diodes for illumination also causes light Inefficient use.

Therefore, the present invention aims to solve the above-mentioned problems by proposing a projection display device and a vehicle having the same, so as to solve the problems caused by the conventional technology.

The present invention provides a projection display device and a vehicle equipped with the projection display device. The projection display device has a display effect of high uniformity and high brightness, and narrows the light emission angle to avoid light diffusion in the device and achieve the purpose of reducing stray light.

To achieve the above object, the present invention provides a projection display device, which includes a light source plate, a parabolic plano-convex lens module, a spherical biconvex lens, a liquid crystal display module and at least one reflector. The light source board has multiple light sources, and the parabolic plano-convex lens module has multiple parabolic plano-convex lenses, wherein the planes of the parabolic plano-convex lenses respectively face the light exit side of the light source. The spherical biconvex lens and the light source plate are respectively located on opposite sides of the parabolic plano-convex lens module. The liquid crystal display module and the parabolic plano-convex lens module are respectively located on opposite sides of the spherical biconvex lens. The light emitted by the light source sequentially passes through the parabolic plano-convex lens, the spherical biconvex lens and the liquid crystal display module of the parabolic plano-convex lens module to form image light. The reflector is located on the light path of the image light, and the reflector reflects the image light to a transparent substrate, thereby generating a virtual image.

In one embodiment of the present invention, the projection display device further includes a hollow cylinder, a fixing member, a diffusion film and a fixing fixture. The hollow cylinder has a first opening and a second opening opposite to each other, wherein the parabolic plano-convex lens module is disposed in the hollow cylinder, the light source plate is disposed on the hollow cylinder to cover the first opening, and the light source is located in the hollow cylinder. middle. The fixing part has a third opening that runs through itself, wherein the fixing part has a first side and a second side opposite to each other, the spherical lenticular lens is fixed on the first side of the fixing part, and the spherical lenticular lens and the fixing part are arranged in the hollow cylinder . The diffusion film is fixed on the second side of the fixing member, and the spherical lenticular lens and the diffusion film cover the third opening. The fixing clamp has a fourth opening that penetrates itself. The fixing clamp is fixed on the hollow cylinder to sandwich the liquid crystal display module between the fixing clamp and the diffusion film, and the liquid crystal display module is exposed through the fourth opening. The light passes through the spherical lenticular lens, the third opening, the second opening, the diffusion film, the liquid crystal display module and the fourth opening in sequence to form image light.

In one embodiment of the present invention, the projection display device further includes a base with a receiving groove, at least one reflector including two reflectors, and the hollow cylinder and the two reflectors are located in the receiving groove. middle.

In one embodiment of the present invention, the transparent substrate is a windshield of a car.

In one embodiment of the present invention, the light source board further includes a printed circuit board, and the light source is disposed on the printed circuit board.

In one embodiment of the present invention, the horizontal axis and the vertical axis of the paraboloid of the parabolic plano-convex lens are both parabolic curves, and the curvature radii of the horizontal axis and the vertical axis are different.

In one embodiment of the present invention, the vertical and horizontal axes of the spherical surface of the spherical lenticular lens facing the liquid crystal display module are both spherical curves, and the vertical and horizontal axes of the spherical surface of the spherical lenticular lens facing the parabolic plano-convex lens module are respectively For spherical curves and straight lines.

In one embodiment of the present invention, the liquid crystal display module is tilted relative to the light source board.

In one embodiment of the present invention, the spherical lenticular lens is tilted relative to the light source plate.

In one embodiment of the invention, the light source is a light emitting diode.

The present invention also proposes a vehicle, which includes a vehicle body and the above-mentioned projection display device, wherein the transparent substrate is a windshield provided in the front frame of the vehicle body and serves as the projection medium.

Based on the above, the projection display device uses a parabolic plano-convex lens module and a spherical lenticular lens to achieve a display effect of high uniformity and high brightness, and reduces the light angle to avoid light diffusion in the device, thereby reducing stray light.

In order to enable your review committee to have a better understanding of the structural features and effects of the present invention, we would like to provide you with a diagram of the preferred embodiment and a detailed description, as follows:

The embodiments of the present invention will be further explained below with reference to relevant drawings. Wherever possible, the same reference numbers are used in the drawings and description to refer to the same or similar components. In the drawings, shapes and thicknesses may be exaggerated for simplicity and ease of notation. It should be understood that components not specifically shown in the drawings or described in the specification are in forms known to those of ordinary skill in the art. Those skilled in the art can make various changes and modifications based on the contents of the present invention.

When an element is referred to as being "on", it can generally mean that the element is directly on the other element, or that the other element exists between them. Conversely, when an element is said to be "directly on" another element, it cannot have other elements between them. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.

References below to "one embodiment" or "an embodiment" refer to a particular element, structure, or feature associated with at least one embodiment. Therefore, “one embodiment” or multiple descriptions of “an embodiment” appearing in multiple places below are not directed to the same embodiment. Furthermore, specific components, structures and features in one or more embodiments may be combined in an appropriate manner.

The disclosure is specifically described with the following examples. These examples are only for illustration, because for those who are familiar with this art, various modifications and modifications can be made without departing from the spirit and scope of the disclosure. Therefore, this disclosure The scope of protection of the disclosed content shall be determined by the scope of the patent application attached. Throughout the specification and claims, unless the content clearly dictates otherwise, the meaning of "a" and "the" includes such statements including "one or at least one" of the element or component. Furthermore, as used in this disclosure, the singular article also includes recitations of plural elements or ingredients unless it is obvious from the particular context that the plural is excluded. Furthermore, as applied to this description and all claims below, "in" may mean "in" and "on" unless the context clearly dictates otherwise. Unless otherwise noted, the terms used throughout the specification and patent claims generally have their ordinary meanings as used in the field, in the disclosure and in the particular context. Certain terms used to describe the disclosure are discussed below or elsewhere in this specification to provide practitioners with additional guidance in describing the disclosure. The use of examples anywhere throughout this specification, including the use of examples of any terminology discussed herein, is for illustrative purposes only and does not, of course, limit the scope and meaning of the disclosure or any exemplified terminology. Likewise, the present disclosure is not limited to the various embodiments set forth in this specification.

It should be understood that the terms "comprising", "including", "having", "containing", "involving", etc., as used herein, are open-ended (open-ended), meaning including but not limited to. In addition, any embodiment or patentable scope of the present invention does not necessarily achieve all the purposes, advantages or features disclosed in the present invention. In addition, the abstract part and title are only used to assist in searching for patent documents and are not used to limit the scope of the patent application for the invention.

Unless otherwise specified, some conditional sentences or words, such as "can", "could", "might", or "may", usually try to express that the embodiment of this case has, But it can also be interpreted as features, components, or steps that may not be needed. In other embodiments, these features, elements, or steps may not be required.

The following will describe a projection display device that utilizes parabolic plano-convex lens modules and spherical biconvex lenses to achieve a display effect of high uniformity and high brightness, and reduces the light angle to avoid light diffusion within the device, thereby reducing stray light.

Figure 1 is a schematic diagram of an embodiment of the projection display device of the present invention. Figure 2 is a structural top view of an embodiment of the light source plate, parabolic plano-convex lens module, spherical lenticular lens and liquid crystal display module of the present invention. Figure 3 is a structural side view of one embodiment of the light source plate, parabolic plano-convex lens module, spherical lenticular lens and liquid crystal display module of the present invention. Please refer to Figures 1, 2 and 3. The projection display device 1 includes a light source plate 10, a parabolic plano-convex lens module 11, a spherical biconvex lens 12, a liquid crystal display module 13 and at least one reflector. 14. For convenience and clarity, a reflector 14 is taken as an example here. The light source board 10 has a plurality of light sources 100. The light sources 100 are, for example, but not limited to light emitting diodes. The parabolic plano-convex lens module 11 has a plurality of parabolic plano-convex lenses 110 , wherein the planes of all parabolic plano-convex lenses 110 face the light exit sides of all light sources 100 respectively, and the parabolic surfaces of the parabolic plano-convex lenses 110 face the spherical biconvex lens 12 . The spherical biconvex lens 12 and the light source plate 10 are respectively located on opposite sides of the parabolic plano-convex lens module 11 . The liquid crystal display module 13 and the parabolic plano-convex lens module 11 are respectively located on opposite sides of the spherical lenticular lens 12 .

The light emitted by all the light sources 100 sequentially passes through all the parabolic plano-convex lenses 110 of the parabolic plano-convex lens module 11 , the spherical lenticular lens 12 and the liquid crystal display module 13 to form image light. Because the reflector 14 is located on the optical path of the image light, the reflector 14 reflects the image light to a transparent substrate 2, thereby generating a virtual image. The transparent substrate 2 can be a windshield of a car, but the invention is not limited thereto. The parabolic plano-convex lens module 11 and the spherical lenticular lens 12 are used to achieve a display effect of high uniformity and high brightness, and to reduce the light emission angle to avoid light diffusion in the device, thereby reducing stray light.

In some embodiments of the present invention, the horizontal axis and the vertical axis of the paraboloid of the parabolic plano-convex lens 110 can both be parabolic curves, and the curvature radii of the horizontal axis and the vertical axis are different, so that the parabolic plano-convex lens 110 is axially symmetrical. Lens can further achieve the light source expansion effect. For example, the curvature radii of the horizontal axis and the vertical axis of the parabolic surface of the parabolic plano-convex lens 110 may be, but are not limited to, 2.5 millimeters (mm) and 4 mm respectively. The refractive index of the parabolic plano-convex lens 110 may be, but is not limited to, 1.56˜1.58. The vertical axis and the horizontal axis of the spherical surface of the spherical lenticular lens 12 facing the liquid crystal display module 13 can both be spherical curves. The vertical axis and the horizontal axis of the spherical surface of the spherical lenticular lens 12 facing the liquid crystal display module 13 have different curvature radii, and The vertical axis and the horizontal axis of the spherical lenticular lens 12 facing the spherical surface of the parabolic plano-convex lens module 11 can be spherical curves and straight lines respectively to achieve the light source expansion effect. The curvature radii of the vertical axis and the horizontal axis of the spherical surface of the spherical lenticular lens 12 facing the liquid crystal display module 13 can be, but are not limited to, 100 mm and 20 mm respectively. The spherical surfaces of the spherical lenticular lens 12 facing the parabolic plano-convex lens module 11 The radius of curvature of the vertical axis may be, but is not limited to, 100 mm. The refractive index of the spherical lenticular lens 12 may be, but is not limited to, 1.56 to 1.58. Specifically, the light source board 10 may further include a printed circuit board 101, and all the light sources 100 are disposed on the printed circuit board 101. In order to effectively distribute the light sources 100 on the screen, the light sources 100 are designed to be non-equally spaced on the printed circuit board 101 .

Figure 4 is an exploded structural view of one embodiment of the light source plate, parabolic plano-convex lens module, hollow cylinder, spherical lenticular lens, fixing member, diffusion film, liquid crystal display module and fixing fixture of the present invention. Figure 5 is a perspective view of the combined structure of one embodiment of the light source plate, parabolic plano-convex lens module, hollow cylinder, spherical lenticular lens, fixing member, diffusion film, liquid crystal display module and fixing fixture of the present invention. Please refer to FIGS. 4 and 5 . In some embodiments of the present invention, the projection display device 1 may further include a hollow cylinder 15 , a fixing member 16 , a diffusion film 17 and a fixing fixture 18 . The hollow cylinder 15 has a first opening 150 and a second opening 151 opposite to each other, in which the parabolic plano-convex lens module 11 is provided in the hollow cylinder 15, and the printed circuit board 101 of the light source board 10 is provided on the hollow cylinder 15. To cover the first opening 150 , and all the light sources 100 are located in the hollow cylinder 15 . The fixing member 16 has a third opening 160 penetrating itself, wherein the fixing member 16 has a first side and a second side opposite to each other, the spherical lenticular lens 12 is fixed on the first side of the fixing member 16, and the spherical lenticular lens 12 and the fixing member 16 is located in the hollow cylinder 15 . The diffusion film 17 may have a microstructure exhibiting an elliptical shape. The diffusion film 17 is fixed on the second side of the fixing member 16 , wherein the spherical lenticular lens 12 and the diffusion film 17 cover the third opening 160 . The fixing clamp 18 has a fourth opening 180 extending through itself. The fixing clamp 18 is fixed on the hollow cylinder 15 to sandwich the liquid crystal display module 13 between the fixing clamp 18 and the diffusion film 17 , and expose the liquid crystal display module 13 through the fourth opening 180 . The light emitted by the light source 100 sequentially passes through the spherical lenticular lens 12, the third opening 160, the second opening 151, the diffusion film 17, the liquid crystal display module 13 and the fourth opening 180 to form image light. If the top side A of the printed circuit board 101 is defined as the horizontal side and the side B as the vertical side, because the spherical lenticular lens 12 and the liquid crystal display module 13 also have mutually perpendicular top sides A' and side B', they are defined similarly. The top side A' of the spherical lenticular lens 12 and the liquid crystal display module 13 is a horizontal side, and the side B' is a vertical side. In order to prevent sunlight from passing through the transparent substrate 2 and directly hitting the liquid crystal display module 13, the liquid crystal display module 13 can be tilted relative to the printed circuit board 101 of the light source board 10. Specifically, the horizontal side of the liquid crystal display module 13 can be tilted 3.06 degrees relative to the horizontal side of the printed circuit board 101, and the vertical side of the liquid crystal display module 13 can be tilted 22 degrees relative to the vertical side of the printed circuit board 101 to avoid defocusing. phenomenon. In order to cooperate with the optical path design of the liquid crystal display module 13, the spherical lenticular lens 12 is tilted relative to the printed circuit board 101 of the light source board 10. Specifically, the horizontal side of the spherical lenticular lens 12 can be tilted 1 degree relative to the horizontal side of the printed circuit board 101, and the vertical side of the spherical lenticular lens 12 can be tilted 2 degrees relative to the vertical side of the printed circuit board 101.

Figure 6 is a structural perspective view of an embodiment of the projection display device of the present invention. Referring to Figures 4 and 6, the projection display device 1 may further include a base 19, and in the embodiment of Figure 6, two reflectors 14 may be used. The base 19 has a receiving groove 190 in which the hollow cylinder 15 and the reflector 14 are located. It can be seen from Figure 6 that the printed circuit board 101 is further away from the sunlight than the liquid crystal display module 13, and the sunlight is indicated by an arrow. The side of the liquid crystal display module 13 has two ends, one end is close to the sun and the other end is away from the sun. The shortest distance between the end close to the sun and the printed circuit board 101 is designed to be greater than the end far away from the sun and the shortest distance from the printed circuit board 101. The shortest distance is to prevent sunlight from passing through the transparent substrate 2 and directly hitting the liquid crystal display module 13.

Figure 7 is a simulation curve diagram of horizontal viewing angle and vertical viewing angle according to the present invention. Please refer to Figure 7. When the number of light sources is four, the brightness uniformity can be 74%. The average brightness of the screen under 3.86 watts is 1870000 nits (nit), and the light output efficiency is 484000 lumens (Im)/ watt. In addition, when the vertical viewing angle is ±12.79 degrees, the corresponding picture has high brightness. When the horizontal viewing angle is ±30.57 degrees, the corresponding picture has high brightness.

Figure 8 is a schematic diagram of an embodiment of the vehicle of the present invention. Please refer to Figures 8 and 6. The projection display device of each of the aforementioned embodiments can be applied to the vehicle 3. The vehicle 3 includes a vehicle body 30 and the projection display device of any of the aforementioned embodiments. The implementation of Figure 6 For example, all the components on the base 19 are arranged in the vehicle body 30 , in which the transparent substrate 2 is a windshield arranged in the front frame of the vehicle body 30 and serves as a projection medium.

According to the above embodiments, the projection display device uses a parabolic plano-convex lens module and a spherical lenticular lens to achieve a display effect of high uniformity and high brightness, and reduces the light emission angle to avoid light diffusion in the device, thereby reducing stray light.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, all equal changes and modifications can be made in accordance with the shape, structure, characteristics and spirit described in the patent scope of the present invention. , should be included in the patent scope of the present invention.

1: Projection display device 10:Light source board 100:Light source 101:Printed circuit board 11: Parabolic plano-convex lens module 110: Parabolic plano-convex lens 12: Spherical biconvex lens 13:LCD display module 14:Reflector 15: Hollow cylinder 150:First opening 151:Second opening 16: Fixtures 160:The third opening 17: Diffusion film 18:Fixed fixture 180:The fourth opening 19:Pedestal 190: Accommodation groove 2:Transparent substrate 3: Vehicle 30 vehicle body A, A’: top edge B, B’: side

Figure 1 is a schematic diagram of an embodiment of the projection display device of the present invention. Figure 2 is a structural top view of one embodiment of the light source plate, parabolic plano-convex lens module, spherical lenticular lens and liquid crystal display module of the present invention. Figure 3 is a structural side view of one embodiment of the light source plate, parabolic plano-convex lens module, spherical lenticular lens and liquid crystal display module of the present invention. Figure 4 is an exploded structural view of one embodiment of the light source plate, parabolic plano-convex lens module, hollow cylinder, spherical lenticular lens, fixing member, diffusion film, liquid crystal display module and fixing fixture of the present invention. Figure 5 is a perspective view of the combined structure of one embodiment of the light source plate, parabolic plano-convex lens module, hollow cylinder, spherical lenticular lens, fixing member, diffusion film, liquid crystal display module and fixing fixture of the present invention. Figure 6 is a structural perspective view of an embodiment of the projection display device of the present invention. Figure 7 is a simulation curve diagram of horizontal viewing angle and vertical viewing angle according to the present invention. Figure 8 is a schematic diagram of an embodiment of the vehicle of the present invention.

1: Projection display device

10:Light source board

100:Light source

101:Printed circuit board

11: Parabolic plano-convex lens module

110: Parabolic plano-convex lens

12: Spherical biconvex lens

13:LCD display module

14:Reflector

2:Transparent substrate

Claims (10)

A projection display device including: A light source board with multiple light sources; A parabolic plano-convex lens module having a plurality of parabolic plano-convex lenses, wherein the planes of the parabolic plano-convex lenses respectively face the light exit sides of the light sources; A spherical biconvex lens, which and the light source plate are located on opposite sides of the parabolic plano-convex lens module; A liquid crystal display module, which and the parabolic plano-convex lens module are located on opposite sides of the spherical biconvex lens, in which the light emitted by the light sources sequentially passes through the parabolic plano-convex lenses of the parabolic plano-convex lens module, the a spherical lenticular lens and the liquid crystal display module to form image light; and At least one reflector is located on the optical path of the image light, wherein the at least one reflector reflects the image light to a transparent substrate, thereby generating a virtual image. The projection display device as described in claim 1 further includes: A hollow cylinder has a first opening and a second opening opposite each other, wherein the parabolic plano-convex lens module is disposed in the hollow cylinder, and the light source plate is disposed on the hollow cylinder to cover the first opening. , and the light sources are located in the hollow cylinder; A fixing member has a third opening running through itself, wherein the fixing member has a first side and a second side opposite to each other, the spherical lenticular lens is fixed on the first side of the fixing member, and the spherical lenticular lens is connected to the first side of the fixing member. The fixing piece is provided in the hollow cylinder; A diffusion film is fixed on the second side of the fixing member, wherein the spherical lenticular lens and the diffusion film cover the third opening; and A fixing clamp has a fourth opening penetrating itself, wherein the fixing clamp is fixed on the hollow cylinder to clamp the liquid crystal display module between the fixing clamp and the diffusion film, and is exposed through the fourth opening In the liquid crystal display module, the light sequentially passes through the spherical lenticular lens, the third opening, the second opening, the diffusion film, the liquid crystal display module and the fourth opening to form the image light. The projection display device according to claim 2, further comprising a base having a receiving groove, the at least one reflecting mirror including two reflecting mirrors, the hollow cylinder and the two reflecting mirrors are located in the container. Place in the groove. The projection display device as claimed in claim 1, wherein the transparent substrate is a windshield of a car. The projection display device as claimed in claim 1, wherein the light source board further includes a printed circuit board, and the light sources are provided on the printed circuit board. The projection display device as claimed in claim 1, wherein both the horizontal axis and the vertical axis of the paraboloids of the parabolic plano-convex lenses are parabolic curves, and the curvature radii of the horizontal axis and the vertical axis are different. The projection display device of claim 1, wherein the vertical axis and the horizontal axis of the spherical surface of the spherical lenticular lens facing the liquid crystal display module are both spherical curves, and the spherical surface of the spherical lenticular lens facing the parabolic plano-convex lens module The vertical axis and horizontal axis of are respectively spherical curves and straight lines. The projection display device as claimed in claim 1, wherein the liquid crystal display module is tilted relative to the light source board. The projection display device as claimed in claim 1, wherein the spherical lenticular lens is tilted relative to the light source plate. a vehicle including a vehicle body; and A projection display device according to any one of claims 1 to 9, provided in the main body of the vehicle; Wherein, the transparent substrate is a windshield disposed in the front frame of the vehicle body, and is used as a projection medium.

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