Movable Blocking Member HUD Stray Light Management
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Solution Overview
Problem
Conventional headup display devices suffer from stray light caused by external light reflection off the transparent cover, which impairs visibility, and the blocking member obstructs the removal of objects entering the device when positioned above the transparent cover.
Innovation Solution
A headup display device with a transmissive member between the display and reflecting member, and a movable blocking member that can shift from a first position blocking light to a second position closer to the transmissive member, allowing easier object removal while preventing stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a blocking member is disposed above the transparent cover to block out external light, then stray light is prevented, but object removal becomes difficult
Solution Approach 1:
The blocking member is designed with a movable end that can shift between a first position (blocking light) and a second position (closer to the transmissive member). This dynamic positioning allows the blocking member to adapt between two functional states: blocking external light to prevent stray light, and moving away to facilitate object removal, thus resolving the contradiction between light blocking and ease of operation.
2Reliability
If a transparent cover is used to prevent object entry, then object protection is achieved, but external light reflection causes stray light
Solution Approach 1:
The blocking member acts as an intermediary element positioned between the transparent cover and the external environment. It selectively blocks harmful external light from reaching the transparent cover while maintaining the cover's protective function, thus preventing stray light generation without compromising object protection.
3Ease of operation
If the blocking member is positioned close to the transmissive member, then object removal is facilitated, but light blocking effectiveness is reduced
Solution Approach 1:
The blocking member's end is designed to move between positions, allowing it to be close to the transmissive member when object removal is needed (facilitating ease of operation) and far from the transmissive member when light blocking is prioritized. This dynamic adjustment resolves the contradiction between operational ease and light blocking effectiveness.
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 solution effectively reduces stray light and facilitates the removal of objects by creating a larger space between the blocking member and transparent cover, enhancing user accessibility and visibility.
Implementation Method 1
a transmissive member that is disposed between the display and the reflecting member to cover the emission surface of the display and transmits the display light emitted from the display toward the reflecting member
Implementation Method 2
a reflecting member that is disposed above the display and reflects the display light emitted from the display
Implementation Method 3
a blocking member that is disposed above the transmissive member and blocks out light that is otherwise reflected off the transmissive member to be incident on the combiner part
Data Source
AI summary
A headup display device includes: a display having an emission surface that emits display light relating to predetermined information; a reflecting member that is disposed above the display and reflects the display light emitted from the display; a combiner part on which the display light reflected off the reflecting member is incident; a transmissive member that is disposed between the display and the reflecting member to cover the emission surface and transmits the display light emitted from the display toward the reflecting member; and a blocking member that is disposed above the transmissive member and blocks out light that is reflected off the transmissive member to be incident on the combiner part. A transmissive-member-side end of the blocking member is disposed to be movable from a first position where the light is blocked out to a second position closer to the transmissive member than the first position is.