Variable Reflective Panel for Head-Up Display Sunlight Management
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Solution Overview
Problem
Head-up displays face issues with display failure and liquid crystal panel degradation due to increased temperature from sunlight irradiation, especially when used in vehicles under sunlight, leading to reduced image visibility and hindered commercialization.
Innovation Solution
A display system incorporating a reflective panel with variable reflection and transmission regions, controlled by a control unit, is used in conjunction with a backlight and magnifying mirror to manage external light incidence, reducing the amount of external light that reaches the liquid crystal panel and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the liquid crystal panel is used to display images in a head-up display system, then image visibility is achieved, but the liquid crystal panel degrades and fails due to temperature increase from sunlight irradiation
Solution Approach 1:
The light receiving surface of the reflective panel is divided into multiple regions (first region and second region) that can be independently controlled. This segmentation allows selective reflection or transmission of light in different areas, enabling the system to block harmful sunlight while maintaining image display functionality in specific regions.
Solution Approach 2:
The reflective panel dynamically changes its optical properties between reflective state and transmissive state based on control signals. This dynamic adjustment allows the system to adapt to varying sunlight conditions and display requirements, blocking harmful light when needed while maintaining visibility when displaying images.
2Object-affected harmful factors
If the reflective panel reflects all incident light, then external light blocking is maximized, but the display system cannot transmit necessary light for image projection
Solution Approach 1:
Different regions of the reflective panel have different optical properties - the first region can be controlled to reflect light while the second region can be controlled to transmit light. This local differentiation allows the system to block harmful external light in specific areas while transmitting necessary light for image projection in other areas.
Solution Approach 2:
The optical parameters (reflectivity/transmissivity) of the reflective panel regions are changed based on control signals. By adjusting these parameters dynamically, the system can optimize the balance between blocking harmful external light and transmitting necessary light for display functionality.
3Temperature
If the liquid crystal panel is irradiated with intense sunlight, then the panel temperature increases, but this causes display failure and reduced reliability
Solution Approach 1:
The reflective panel is positioned to block sunlight from reaching the liquid crystal panel before the light can cause excessive heating. By establishing this protective barrier in advance, the system prevents the temperature increase that would lead to display failure and reliability issues.
Solution Approach 2:
The reflective panel acts as an intermediary element between the external sunlight and the liquid crystal panel. It selectively reflects or transmits light based on control signals, mediating the interaction between external light and the display panel to prevent harmful thermal effects while maintaining necessary optical functionality.
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 effectively suppresses temperature increases and prevents display failure by dynamically controlling light regions, ensuring improved image visibility and reliability under sunlight conditions.
Implementation Method 1
a backlight located at a back surface side of the display panel and irradiating light on the display panel
Implementation Method 2
a reflective panel located at a front surface side of the display panel and having a light receiving surface inclined obliquely in a direction perpendicular to an optical axis of the backlight
Implementation Method 3
a magnifying mirror located at a position where a reflected light from the reflective panel is received
Data Source
AI summary
A display system in an embodiment according to the present invention includes a display panel, a backlight located at a back surface side of the display panel and that emits light toward the display panel, a reflective panel located at a front surface side of the display panel and having a light receiving surface inclined obliquely in a direction perpendicular to an optical axis of the backlight, and a magnifying mirror disposed at a position where a reflected light from the reflective panel is received. The reflective panel includes a reflection region and a transmission region in the light receiving surface, and a position and a size of the reflection region and the transmission region are variable.