HUD Optical Blocking Control for Sunlight Damage Prevention
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Solution Overview
Problem
Head-up display (HUD) systems using Augmented Reality (AR) face challenges in preventing damage from sunlight, as widening the display region to accommodate more information makes the display panel susceptible to sunlight damage, and existing methods to block sunlight either fail to provide sufficient protection or restrict the HUD's usage time.
Innovation Solution
A head-up display apparatus equipped with a light source, display panel, reflection mirror, solar radiation sensor, and a blocking mechanism controlled by a protection processor, which adjusts the optical path to block sunlight based on estimated temperature and intensity, ensuring the display panel's protection while minimizing downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the opening size is widened to expand the display region, then the display region area is improved, but the display panel becomes more susceptible to sunlight damage
Solution Approach 1:
The optical path is divided into two separate paths: a projected light path for displaying information and an incident light path for sunlight. By segmenting the optical paths, the system can allow the display region to be wide while preventing sunlight from reaching the display panel through the blocking mechanism that selectively blocks only the sunlight path.
Solution Approach 2:
The blocking mechanism acts as an intermediary element positioned in the optical path between the sunlight source and the display panel. It mediates by selectively blocking harmful sunlight while allowing the projected display light to pass through, thus protecting the display panel without compromising the display region area.
2Reliability
If the blocking mechanism is activated to completely block sunlight, then the display panel protection is improved, but the HUD usage time is reduced
Solution Approach 1:
The blocking mechanism is designed to be dynamically controllable, allowing it to be activated or deactivated based on real-time detection of sunlight conditions. The control unit monitors environmental conditions and adjusts the blocking mechanism accordingly, enabling the HUD to maintain high reliability when needed while maximizing usage time when sunlight is not a threat.
Solution Approach 2:
The system incorporates a feedback mechanism where the control unit continuously monitors sunlight conditions and adjusts the blocking mechanism's state accordingly. This feedback loop ensures that the blocking mechanism is activated only when necessary to protect the display panel, thereby maintaining reliability while minimizing the impact on HUD usage time.
3Adaptability or versatility
If the transparent window portion size is changed according to display image size, then the display flexibility is improved, but sufficient protection against sunlight condensing points cannot be achieved
Solution Approach 1:
The system segments the optical paths into projected light path and incident light path, allowing the transparent window portion to maintain a fixed size that provides sufficient protection against sunlight condensing points, while the display flexibility is achieved through other means such as adjusting display content or using reflective surfaces.
Solution Approach 2:
The blocking mechanism serves as an intermediary that provides consistent protection against sunlight condensing points regardless of the transparent window portion size. This allows the display flexible to be optimized for display flexibility without compromising protection, as the blocking mechanism compensates for any potential sunlight exposure.
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 prevents sunlight damage to the display panel, ensuring user convenience by extending the usable time of the HUD system while protecting the display panel from overheating.
Implementation Method 1
a solar radiation sensor, a blocking mechanism controlled by a protection processor
Implementation Method 2
adjusts the optical path to block sunlight based on estimated temperature and intensity
Data Source
AI summary
Provided is a head-up display apparatus capable of preventing damage due to sunlight and ensuring user convenience. A reflection mirror M1 reflects an image created by a display panel and projects it onto a display region. A solar radiation sensor detects a sunlight intensity when a position of sun exists within a predetermined detection range. A blocking mechanism forms a projected light path of an image between the display region and the display panel when being turned off, and blocks the projected light path of the image and an incident light path of the sunlight which is direction opposite thereto when being turned on. A protection processor controls ON/OFF of the blocking mechanism based on an estimated temperature of the display panel, which is estimated by using a sunlight intensity from the solar radiation sensor, luminance of a light source, and an ambient temperature.