Image generation unit of automobile HUD

Abstract

The utility model provides an image generation unit of an automobile HUD, which comprises a TFT screen, an optical filter and a backlight plate, the optical filter is arranged on the lower surface of the TFT screen, the backlight plate is horizontally arranged below the TFT screen, the upper surface of the backlight plate is provided with a plurality of LED light-emitting units, the image generation unit is characterized by further comprising a collimating plate, the collimating plate is arranged between the backlight plate and the TFT screen, and the collimating plate is arranged between the backlight plate and the TFT screen. The number of the collimation dimming mirrors is the same as that of the LED light-emitting units, and the collimation dimming mirrors are in one-to-one correspondence with the LED light-emitting units up and down. According to the utility model, the collimating plate is arranged between the backlight plate and the TFT screen, the collimating plate collimates the LED light, and the collimated LED light enters the optical filter and is eventually homogenized, so that the homogenization effect of the light and the utilization rate of energy are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile HUD, and in particular relates to an image generation unit of an automobile HUD. Background Art

[0002] An automotive HUD (Head-Up Display) uses an optical system to project a small image generated by a Picture Generation Unit (PGU) onto the windshield, where it is reflected into the human eye, forming a magnified virtual image. The PGU is the image source, and currently, the mainstream PGU uses an LED array as a backlight to illuminate a TFT screen.

[0003] The LED light-emitting unit is actually close to a point-divergent light source. After the light is emitted from the LED light-emitting unit, it is approximately in the form of a light cone. A filter is needed to uniformize the light before illuminating the TFT screen. Since the filter relies on the diffuse reflection of the tiny texture on it to uniformize the light, and the thickness of the filter itself is very thin, the diffuse reflection effect and the energy leakage of off-axis light are large, so the uniformization effect of the light is limited, and the problem of uneven brightness still exists. At the same time, the energy utilization rate is not high and the backlight loss is large. Utility Model Content

[0004] Based on this, in order to solve the above technical problems, an image generation unit for an automobile HUD is provided.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] An image generation unit for an automotive HUD comprises a TFT screen, a filter, and a backlight panel, wherein the filter is disposed on the lower surface of the TFT screen, the backlight panel is disposed horizontally below the TFT screen, and has a plurality of LED light-emitting units on its upper surface. The unit is characterized in that it further comprises a collimator panel, which is disposed between the backlight panel and the TFT screen and is parallel to the backlight panel, and has collimating dimming mirrors thereon, the same number as the LED light-emitting units, and in a one-to-one correspondence with each other.

[0007] The utility model provides an image generation unit for an automobile HUD. A collimator is arranged between a backlight panel and a TFT screen. The collimator collimates LED light. The collimated LED light then enters a filter for final homogenization, thereby improving the light homogenization effect and energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural diagram of the utility model;

[0009] Figure 2This is a schematic diagram of the utility model. DETAILED DESCRIPTION

[0010] The following will illustrate the implementation of the present utility model in conjunction with the drawings in the specification. It should be noted that the implementation methods involved in this specification are not exhaustive and do not represent the only implementation methods of the present utility model. The following corresponding embodiments are only for the purpose of clearly illustrating the utility model content of the utility model patent and are not intended to limit its implementation methods. For ordinary technicians in this field, different forms of changes and modifications can be made on the basis of the description of this embodiment. All obvious changes or modifications that belong to the technical concept and utility model content of the present utility model are also within the scope of protection of the present utility model.

[0011] like Figure 1 As shown, an embodiment of the present invention provides an image generation unit for an automobile HUD, including a TFT screen 110 , a filter 120 , a backlight plate 130 and a collimator plate 140 .

[0012] The TFT panel 110 is arranged at an angle.

[0013] The filter 120 is fixed on the lower surface of the TFT panel 110 .

[0014] The upper surface of the backlight panel 130 has a plurality of LED light emitting units 131 , which are arranged in an array.

[0015] The backlight panel 130 is horizontally disposed below the TFT panel 110 .

[0016] The collimating plates 140 are arranged between the backlight plate 130 and the TFT screen 110 and are parallel to the backlight plate 130 . There are two collimating plates 140 .

[0017] Each collimating plate 140 has multiple collimating light-adjusting mirrors 141 for collimating and adjusting the passing light, wherein the collimating light-adjusting mirrors 141 are convex spherical mirrors or convex free-form surface mirrors. The number of the multiple collimating light-adjusting mirrors 141 is the same as the number of the LED light-emitting units 131 on the backlight plate 130 and corresponds one to one up and down.

[0018] In order to reduce the energy loss of off-axis light, each collimator plate 140 is formed with a light-blocking wall 142 extending upward on its four edges. Based on this, the two collimators 140 are stacked up and down through their respective light-blocking walls 142. The collimator plate 140 closest to the backlight plate 130 is formed with a supporting foot 143 that supports the backlight plate 130. Figure 2 .

[0019] like Figure 2As shown, the light emitted from the multiple LED light-emitting units 131 undergoes a collimation adjustment once through the collimating dimming mirror 141 of the lower collimating plate 140, so that the angle of the light cone converges to a certain extent, and then undergoes a second collimation adjustment through the collimating dimming mirror 141 of the upper collimating plate 140, so that the angle of the light cone further converges to achieve basic collimation.

[0020] The shape of the collimating light-adjusting mirrors 141 of the two collimating plates 140 can be adjusted based on the LED's light cone angle and the desired location of the collimated light exit surface, ensuring that the light at the exit surface meets the collimation requirements. A circle of light-blocking walls 142 surrounding the two collimating plates 140 is completely enclosed, allowing large-angle off-axis light to be reflected back from the light-blocking walls 142, reducing energy loss in the off-axis light.

[0021] By applying PC TARFLON LEV1700 material to the collimating light-adjusting mirror 141 and performing optical simulation, it can be obtained that after the light passes through the two collimating plates 140, the uniformity is greater than 70%, and the ratio of the energy of the collimated light to the total energy of the LED light source is greater than 50%. In this way, after passing through the filter 120, the uniformity is greater than 90%. Since the collimated light enters the filter 120, the energy loss in the filter is very small, which optimizes the backlight efficiency of the image generation unit.

[0022] In the above embodiment, since the collimating light-adjusting mirror 141 adopts a convex spherical mirror or a convex free-curve mirror, the two collimating plates 140 are thicker after being stacked, and the surface shape of the convex spherical mirror or the convex free-curve mirror is required to be high. In order to reduce the thickness, in a possible embodiment, a Fresnel lens can be used as the collimating light-adjusting mirror 141, so that only one collimating plate 140 is required.

[0023] As can be seen from the above, an embodiment of the present invention provides an image generation unit for an automotive HUD, in which a collimator is arranged between the backlight panel and the TFT screen. The collimator collimates the LED light, and the collimated LED light then enters the filter for final homogenization, thereby improving the light homogenization effect and energy utilization.

[0024] Obviously, those skilled in the art should realize that the above embodiments are only used to illustrate the present invention and are not used to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. An image generation unit for an automotive HUD, comprising a TFT screen, a filter, and a backlight panel, wherein the filter is disposed on the lower surface of the TFT screen, and the backlight panel is disposed horizontally below the TFT screen and has a plurality of LED light-emitting units on its upper surface, characterized in that: It also includes a collimating plate, which is arranged between the backlight plate and the TFT screen and is parallel to the backlight plate. The collimating plate has collimating dimming mirrors that are the same in number as the LED light-emitting units and correspond one to another.

2. The image generation unit of the automobile HUD according to claim 1, characterized in that: The TFT screen is arranged tilted.

3. The image generation unit of the automobile HUD according to claim 1, characterized in that: The edges around the collimating plate form light-blocking walls extending upward.

4. The image generation unit of the automobile HUD according to claim 3, characterized in that: There are multiple collimating plates, which are stacked up and down via respective light-blocking walls. The collimating light-adjusting mirror is a convex spherical mirror or a convex free-form surface mirror.

5. The image generation unit of the automobile HUD according to claim 4, characterized in that: The number of the collimating plates is two.

6. The image generation unit of the automobile HUD according to claim 3, characterized in that: The number of the collimating plate is one, and the collimating light-modulating mirror is a Fresnel lens.

7. The image generation unit for an automobile HUD according to any one of claims 4 to 6, characterized in that: Support legs supported on the backlight plate are formed on the collimating plate closest to the backlight plate.

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