Variable Diaphragm Projection Control for Adaptive HUD Brightness

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Solution Overview

Problem

Existing projection generation units (PGU) in head-up displays (HUDs) lack adjustability, leading to poor optical performance in varying external environments, affecting image clarity and driver comfort, and potentially causing safety hazards due to unstable projection effects under different light intensities.

Innovation Solution

A projection adjustment system utilizing variable diaphragms and a control module to adaptively adjust light intensity and contrast by controlling diaphragm apertures based on external light conditions, ensuring clear and comfortable projection viewing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the PGU system uses a fixed optical configuration, then the device complexity is reduced, but the adaptability to different external light intensities deteriorates

Engineering Contradiction:

Improveoptical configuration complexityVSAvoidadaptability to external light intensity

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent introduces variable diaphragms that can dynamically adjust their aperture sizes based on external light intensity conditions. The control module receives light intensity signals and automatically adjusts the diaphragm apertures to optimize projection image brightness and contrast, transforming the fixed optical system into an adaptive dynamic system that responds to environmental changes.

Inventive Principle:

Principle #15Dynamics

2Illumination intensity

If the PGU system increases projection brightness to compensate for strong external light, then the visibility of projection image is improved, but the eye comfort deteriorates due to excessive brightness

Engineering Contradiction:

Improveprojection image brightnessVSAvoideye discomfort

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the optical parameters (aperture sizes) of the variable diaphragms based on external light intensity conditions. When external light is strong, the system adjusts the diaphragm apertures to optimize the light flux reaching the projection image, achieving appropriate brightness without excessive intensity that would cause eye discomfort.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If the PGU system reduces projection brightness in weak light conditions, then the eye comfort is improved, but the visibility of projection image deteriorates

Engineering Contradiction:

Improveeye comfortVSAvoidprojection image brightness

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The control module adjusts the diaphragm aperture parameters based on detected light intensity. In weak external light conditions, the system enlarges the diaphragm apertures to increase the light flux, ensuring the projection image maintains sufficient brightness for visibility while avoiding excessive brightness that would cause eye discomfort.

Inventive Principle:

Principle #35Parameter changes

4Device complexity

If the PGU system uses fixed diaphragm apertures, then the device complexity is reduced, but the image quality under varying light conditions deteriorates

Engineering Contradiction:

Improvediaphragm control complexityVSAvoidimage quality

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent implements dynamic adjustment of diaphragm apertures through variable diaphragms controlled by a control module. This dynamic configuration allows the system to optimize image quality under varying external light conditions, compensating for the increased device complexity by delivering superior and adaptive imaging performance.

Inventive Principle:

Principle #15Dynamics

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

The system maintains clear and comfortable projection viewing across varying light intensities by dynamically adjusting light flux, enhancing image quality and reducing eye strain, thereby improving driving safety.

Implementation Method 1

each variable diaphragm adjusts at least one diaphragm aperture of the variable diaphragm under the control of the controller, and light intensity of the light cast outward is adjusted by reducing or enlarging the diaphragm aperture

Methodology Applied

Scientific EffectLight flux control through aperture adjustment:

Implementation Method 2

a light sensing module, wherein the light sensing module detects the brightness and contrast of the projection image

Methodology Applied

Scientific EffectLight detection: Photoelectric Effect

Data Source

PatentUS12519912B2Projection adjustment system and method, and projection color adjustment system and method

Publication Date: 2026.01.06 NINGBO SUNNY AUTOMOTIVE OPTECH

AI summary

The present disclosure provides a projection adjustment system and method, and a projection color adjustment system and method. The projection adjustment system comprises an illumination module, a projection module, and a variable diaphragm control module, wherein the illumination module casts light carrying imaging information, wherein the projection module obtains the light carrying the imaging information and then casts it outward to a projection plane, wherein the variable diaphragm control module comprises at least one variable diaphragm and a controller, and wherein each variable diaphragm adjusts at least one diaphragm aperture of the variable diaphragm under the control of the controller, and the light intensity of the light cast outward is adjusted by reducing or enlarging the diaphragm aperture.