Collimating lens and microarray Fresnel lens combined HUD backlight system

Abstract

The invention discloses a collimating lens and microarray Fresnel lens combined HUD backlight system. The invention relates to the technical field of HUD backlight systems. The collimating lens and microarray Fresnel lens combined HUD backlight system comprises an LED patch board, a collimating lens combination, a microarray Fresnel lens and an LCD screen which are arranged in sequence, wherein the collimating lens combination is a combination of six spherical convex lenses for collimating the LED patch board, the focal length of the microarray Fresnel lens is negative, a first transmission surface of the microarray Fresnel lens is a Fresnel surface, and a second transmission surface of the microarray Fresnel lens is a microarray surface with a strip-shaped concave surface. According to the collimating lens and microarray Fresnel lens combined HUD backlight system, the collimating lens and the Fresnel lens of a collimating convergence optical device are combined to form the combined HUD backlight system, the cost can be effectively reduced, and the light energy utilization rate and the image uniformity are improved.

Description

technical field [0001] The invention relates to the technical field of HUD backlight systems, in particular to a combined HUD backlight system of a collimator lens and a microarray Fresnel lens. Background technique [0002] The car windshield-type head-up display (HUD) display device that can present the information required for driving on the front windshield of the car and avoid the driver needing to look down at the instrument information has aroused the interest of many manufacturers and consumers. With the development of HUD design In order to develop, the HUD backlight system requires low power to provide high-brightness uniform images and requires a small number of optical components and small volume, thereby lowering the cost. [0003] A combined HUD backlight system is used in the prior art solution, [0004] The prior art scheme is as follows: as Figure 8 As shown, the light emitted by the LED patch is relatively collimated by the total reflection lens (11), and...

AI Technical Summary

Problems solved by technology

[0005] Defects in the existing technology: the HUD backlight mode mostly uses total reflection lenses, fly-eye lenses, plane mirrors and multiple shaping lenses to uniform light, control the angle and direction of the beam, and the multi-lens design is due to the light absorption loss of each lens. As a result, the utilization rate of light energy is low. In order to achieve the brightness and uniformity of the final image, it is necessary to increase the number of LED patches or increase the power of LED patches. The number of lenses used in the mode is large, resulting in a larger design size and higher cost

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