Automotive HUD Electrochromic Sunlight Blocking Without Moving Parts

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Solution Overview

Problem

Conventional head-up display systems are vulnerable to damage from sunlight due to direct sunlight exposure, which can erode reflective coatings and damage components, and existing solutions require larger HUD systems or mechanical adjustments that are space-constrained.

Innovation Solution

Incorporation of an electrochromic panel in the HUD system that blocks or reduces sunlight using electrochromism, controlled by a vehicle's ECU to adjust transparency based on vehicle status, without altering the HUD's position or size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the tilt range of lenses and mirrors is extended to block sunlight, then protection from solar rays is improved, but the HUD system size increases

Engineering Contradiction:

Improvesunlight damage to optical componentsVSAvoidHUD system size

Core Design Contradiction:

Object-affected harmful factorsVSVolume of moving object

Solution Approach 1:

The patent replaces the mechanical adjustment mechanism (extending tilt range of lenses/mirrors) with an electrochromic panel that uses electrical control to block sunlight. The electrochromic panel changes its optical properties through voltage application, eliminating the need for mechanical movement and additional space.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The electrochromic panel changes its optical parameters (transparency/opacity) in response to voltage changes. By controlling the electrochromic state through electrical signals, the system blocks sunlight without physical movement, maintaining compact HUD system dimensions while providing protection.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If mechanical adjustment mechanisms are added to extend tilt range, then sunlight protection is improved, but device complexity increases

Engineering Contradiction:

Improvesunlight exposure to PGUVSAvoidHUD system complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent eliminates mechanical adjustment mechanisms by using an electrochromic panel controlled by electrical signals. This substitution reduces mechanical complexity while achieving the same protective function of blocking sunlight from reaching the PGU.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts the sunlight blocking function from the optical path adjustment mechanism and implements it separately through the electrochromic panel. This separation allows the original optical components to remain simple while adding protection through a different mechanism.

Inventive Principle:

Principle #2Taking out (Extraction)

3Ease of manufacture

If the HUD system position is fixed, then installation flexibility is improved, but sunlight protection capability deteriorates

Engineering Contradiction:

ImproveHUD system installationVSAvoidsunlight damage risk

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent replaces mechanical position adjustment with an electrochromic panel that blocks sunlight through optical property changes. This allows the HUD system to maintain its fixed installation position while still protecting against sunlight damage.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The electrochromic panel acts as an intermediary element in the optical path that blocks sunlight without requiring changes to the HUD system's physical position or configuration. It mediates between the fixed installation requirement and the sunlight protection need.

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Effectively blocks sunlight without mechanical adjustments, preserving HUD components and maintaining system integrity, while adapting to different conditions.

Implementation Method 1

an electrochromic panel system arranged in the optical path created from the light output of the PGU to the light output of the reflective mirror/lens array

Methodology Applied

Scientific EffectElectrochromism: Electrochromism

Data Source

PatentUS20260036862A1Head up display without mechanical light blocker

Publication Date: 2026.02.05 CONTINENTAL AUTOMOTIVE SYSTEMS INC

AI summary

An automotive head up display includes a picture generating unit configured to generate a video image to be displayed to a driver as a virtual image on a windshield; an optical system including: a first mirror and a second mirror; the first mirror for guiding the video image from the picture generating unit to a second mirror; the second mirror for guiding the video image from the first mirror to the windshield; at least one electrochromic panel in fluid communication with an ECU, arranged and covering an optical path defined between the windshield and a light output of the picture generating unit; wherein, when the ECU establishes a first condition, the at least one electrochromic panel is energized by an electrical signal and becomes substantially opaque, preventing the passage of solar rays reflected by the second mirror towards the image generating unit.