Rotatable Polarizer Layout for HUD Display Heat Suppression
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Solution Overview
Problem
Existing image display devices for vehicles, such as head-up displays, face temperature rises due to external light condensation, with insufficient heat management measures.
Innovation Solution
An image display device with a housing containing a display unit, a reflection unit, a first polarizing unit, a second rotatable polarizing unit, and an adjustment unit that rotates the second polarizing unit to adjust its polarization axis relative to the first, controlling the transmission of external light and reducing heat buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reflection mirror is used to project display light, then the display light can be projected onto the windshield, but external light is condensed on the display causing temperature rise
Solution Approach 1:
A polarizing unit is introduced as an intermediary component between the display and the reflection mirror. This polarizing unit selectively transmits display light while blocking condensed external light, thereby mediating the optical path to prevent temperature rise without affecting the projection function
Solution Approach 2:
The polarization state of light is changed to differentiate between display light and external light. By controlling the polarization parameters, the system allows display light to pass through while blocking external light that causes heating, thus resolving the temperature issue while maintaining projection reliability
2Temperature
If a polarizing unit is added to block external light, then temperature rise is suppressed, but device complexity increases
Solution Approach 1:
The polarizing unit serves multiple functions simultaneously: it blocks external light to prevent heating, transmits display light for projection, and can be rotated to adjust performance. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
3Device complexity
If the polarization axis is fixed, then the structure is simple, but external light transmission cannot be adjusted
Solution Approach 1:
The polarizing unit is made rotatable around the optical axis, transforming it from a static component to a dynamic one. This rotational capability allows the polarization axis to be adjusted to different angles, enabling adaptive control of external light transmission while maintaining a relatively simple structural design
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 suppresses temperature rises in the display unit by adjusting the polarization axis of the second polarizing unit to minimize external light condensation, ensuring efficient heat management and maintaining image display quality.
Implementation Method 1
a first polarizing unit that is provided in the housing, is disposed on an optical path on which the display light passes, and polarizes, along a first polarization axis, external light made incident on the housing from an outside
Implementation Method 2
a second polarizing unit that is provided in the housing, is disposed on the optical path, is rotatably provided centering on an axis extending along the optical path, and polarizes the external light along a second polarization axis
Implementation Method 3
a reflection unit that is provided in the housing and reflects the display light and project the display light onto a display member
Data Source
AI summary
An image display device includes a display unit provided in a housing and emits display light, a reflection unit that reflects the display light and projects the display light on a display member, a first polarizing unit provided in the housing, is disposed on an optical path on which the display light passes, and polarizes, along a first polarization axis, external light made incident on the housing from the outside, a second polarizing unit provided in the housing, is disposed on the optical path, is rotatably provided centering on an axis along the optical path, and polarizes the external light along a second polarization axis. The image display device further includes an adjustment unit that rotates the second polarizing unit based on condensing information of the display unit and changes the direction of the second polarization axis to adjust a transmission amount of the external light on the optical path.