Vehicle Display Light Control for Variable Eye Box Viewing

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Solution Overview

Problem

Conventional vehicle display devices face challenges in providing clear virtual image display across varying eye points without increasing power consumption.

Innovation Solution

A vehicle display device with a controller that adjusts the emission angle of display light based on detected eye points or eye boxes, using a combination of light sources and reflection members to project light at optimal positions, thereby optimizing light distribution without increasing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the output of emission light from the light source is increased to provide clear virtual image display at varying eye points, then the display clarity is improved, but the power consumption increases

Engineering Contradiction:
Improvedisplay clarityVSAvoidpower consumption
Core Design Contradiction:
Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic control of the light source output based on detected eye point position. The controller adjusts the emission light intensity in real-time according to the occupant's eye position, providing sufficient brightness only when and where needed, rather than maintaining high output continuously. This dynamic adjustment resolves the contradiction by enabling clear display at varying eye points while preventing unnecessary power consumption during periods of low or no viewing demand.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The system changes the emission parameters (intensity, angle) of the light source based on detected eye point coordinates. By varying these parameters dynamically rather than maintaining fixed high-output settings, the system achieves clear virtual image display at different eye positions without continuously consuming maximum power, thus resolving the contradiction between display clarity and power consumption.

Inventive Principle:
Principle #35Parameter changes

2Adaptability or versatility

If the light source output is increased to accommodate varying eye points, then the adaptability to different occupant positions is improved, but the power consumption increases

Engineering Contradiction:
Improveadaptability to eye point variationVSAvoidpower consumption
Core Design Contradiction:
Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The system dynamically adapts to varying eye points by continuously detecting eye position and adjusting light source output accordingly. This dynamic adaptation enables the system to handle different occupant positions effectively while avoiding the need to maintain high power output for all possible positions simultaneously, thus achieving adaptability without proportional power consumption increase.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The system uses eye position detection to automatically regulate its own light output, adjusting emission intensity and angle based on actual viewing conditions. This self-regulating mechanism provides adaptability to different eye points while consuming only the necessary amount of power for current viewing conditions, rather than operating at high power levels continuously.

Inventive Principle:
Principle #25Self-service

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 device provides clear virtual image display while maintaining low power consumption by adjusting light emission angles according to the occupant's eye point, reducing the need for increased light source output.

Implementation Method 1

a reflection member configured to reflect the display light emitted from the displaying part to project the display light on the projection target part in the cabin

Methodology Applied
Scientific EffectReflection: Reflection

Data Source

PatentUS12474774B2Vehicle display device
Publication Date: 2025.11.18 YAZAKI CORP
  • US12474774B2 patent drawing
  • US12474774B2 patent drawing
  • US12474774B2 patent drawing

AI summary

A vehicle display device includes a displaying part configured to emit, as display light, display information to be viewed and recognized by an occupant in a cabin as a virtual image, a reflection member configured to reflect the display light emitted from the displaying part to project the display light on a projection target part in the cabin, and a controller configured to control the display light in accordance with a detection eye box representing a detection result of an eye box representing a range of an eye point of the occupant and allowing the virtual image to be viewed and recognized.