Display Instrument Transparent Pane Reducing Reflections
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Solution Overview
Problem
Existing display instruments for motor vehicles face challenges in readability due to excessive light reflection and transmission, making it difficult for display elements to be visible without backlighting, and existing solutions do not adequately address these issues.
Innovation Solution
A display instrument with a transparent pane of reduced light transmission, combined with a polarizing filter, is used to minimize reflections and enhance readability, allowing for separate lighting of display elements and maintaining a uniform appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a transparent cover plate with reduced light transmission is used, then reflections are reduced, but display elements are not visible without backlighting
Solution Approach 1:
A transparent pane with reduced light transmission is introduced as an intermediary element between the cover plate and the display elements. This pane selectively attenuates reflected light while allowing light from actively illuminated display elements to pass through, thereby reducing reflections without permanently obscuring the display content
Solution Approach 2:
The light transmission parameter of the transparent pane is specifically optimized to reduce reflections from the cover plate while maintaining sufficient visibility of display elements when they are actively lit. The pane's transmission characteristics are tuned to create a dark surface appearance during inactive states while allowing clear viewing during active display states
2Loss of information
If a transparent pane with reduced light transmission is placed inside the display instrument, then readability is improved, but display elements behind the pane become less visible
Solution Approach 1:
The display system operates in periodic cycles where display elements are activated only when information needs to be presented. The transparent pane remains in place continuously, but its effect on visibility is periodic - obscuring the view during inactive periods when readability is not required, and becoming transparent during active periods when information display is needed
Solution Approach 2:
The transparent pane acts as a mediator that creates a dark surface appearance during inactive states to improve readability, while allowing light from actively illuminated display elements to pass through during active states, thus resolving the contradiction between readability and visibility
3Stability of the object's composition
If separate lighting is provided for dial and transparent pane, then uniform impression is achieved, but device complexity increases
Solution Approach 1:
The lighting system is segmented into separate lighting sources for the dial and the transparent pane. This segmentation allows independent control of lighting intensity and timing for each component, enabling the achievement of a uniform visual impression across the entire display instrument while maintaining the ability to optimize each lighting zone separately
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
This configuration improves readability by reducing reflections and allowing only necessary information to be visible, enhancing the clarity and ease of reading for the driver without compromising the display's uniformity or brightness.
Implementation Method 1
a polarizing filter is applied to the transparent pane. The polarizing filter absorbs at least half of the incident, unpolarized light
Implementation Method 2
a transparent pane with reduced light transmission is arranged inside the display instrument... the transparent pane with means for reducing the light transmission inside the display instrument results in a dark surface inside the display instrument
Data Source
Figure 1~2
AI summary
Display instrument with at least one screen display (3) and with at least one indicator light (13), wherein the at least one screen display (3) and the at least one indicator light (13) are covered by a transparent disc (5) in the direction of a viewer, wherein the transparent disc (5) has means for reducing the light transmission through the transparent disc, characterized in that the transparent disc (5) is arranged in an interior of a housing (2, 14, 15) of the display instrument (20).