Head-up display unit

By using a tapered sidewall reflector array for light collimation and local dimming in a head-up display, the problems of high thermal shock and high power consumption in liquid crystal displays are solved, achieving efficient and uniform light intensity distribution and a compact design.

CN120936932APending Publication Date: 2025-11-11CONTINENTAL AUTOMOTIVE TECHNOLOGIES GMBH
View PDF 6 Cites 0 Cited by

Patent Information

Application Number
CN202480023453.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-04-18
Filing Date
2024-04-12
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

The high brightness requirements of LCDs in existing head-up displays lead to high thermal shock and high power consumption issues, and existing local dimming solutions are expensive and difficult to achieve uniform light intensity distribution.

Method used

A transparent solid-state reflector array with tapered sidewalls is used to achieve light collimation and local dimming through total internal reflection and multiple reflections, avoiding the use of expensive reflective coatings and optimizing light distribution by utilizing the geometry and angular distribution of the reflectors.

Benefits of technology

It achieves efficient local dimming, reduces heat load and power consumption, provides uniform light intensity distribution and a compact design, making it suitable for automotive head-up displays.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN120936932A_ABST
    Figure CN120936932A_ABST
Patent Text Reader

Abstract

A head-up display unit (1) according to the present invention comprises a picture generation unit (10) for creating an image to be displayed to a viewer as a virtual image (VB), an optical unit (14) for projecting the image to be displayed toward an eye box (4); the picture generation unit (10) comprises a two-dimensional array (131) of light sources (132), an array (117) of reflectors (17, 17 ') for collimating light emitted by the light sources (132), each of these reflectors (17, 17') having tapered sidewalls (171, 172, 173, 175), a display panel (11) for receiving collimated light from the array (117) of reflectors (17, 17 '), and a display panel (12) for displaying the collimated light from the array (117) of reflectors (17, 17'). The light modulator modulates the received light with the image information and emits the modulated light (SB1) as an image to be displayed. Advantageously, each reflector (17, 17 ') is composed of a transparent solid body, said reflector having a light entry surface (171), a light exit surface (176) and tapered light reflecting sidewalls (172, 173, 174, 175).
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Backlight system of HUD, design method, head-up display system and vehicle

    CN115220233A

  • Picture generation unit for head-up display

    US20190369392A1

  • Illumination device for use in local dimming

    US20210294161A1

  • Head-up display with local dimming

    US20210405450A1

  • Virtual image display device

    WO2022004223A1