Hidden Until Lit Display Panel Crosstalk Reduction
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Solution Overview
Problem
Existing display panels for automotive vehicles face challenges in providing uniform brightness and homogeneity with constant directivity while preventing cross-talk between symbols, and are prone to malfunction due to computer system failures.
Innovation Solution
A display panel with a layered construction comprising a translucent base layer, an opaque stencil layer, an opaque crosstalk reduction layer, a semi-opaque hidden until lit layer, and a tinted layer, made from materials like plastic, foil, paint, or lacquer, which allows for diffuse reflection and prevents light leakage, ensuring symbols are only visible when illuminated and reducing cross-talk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single translucent layer with printed symbols is used, then the display panel is simple to manufacture, but cross-talk between adjacent symbols occurs and brightness uniformity is poor
Solution Approach 1:
The display panel is divided into multiple functional layers: a translucent base layer for light diffusion, opaque stencil layers for symbol definition, and semi-opaque hidden-until-lit layers for contrast enhancement. This segmentation isolates light paths for each symbol, preventing cross-talk while maintaining manufacturing feasibility through layer-by-layer construction.
Solution Approach 2:
The solution transitions from a single 2D printed layer to a multi-layer 3D structure with varying opacity levels. By adding the opaque and semi-opaque layers in sequence, the patent creates depth separation that blocks light laterally while allowing vertical light transmission, eliminating cross-talk without sacrificing manufacturing simplicity.
2Object-affected harmful factors
If a multi-layer construction with opaque and semi-opaque layers is used, then cross-talk is reduced and brightness uniformity is improved, but the device complexity increases
Solution Approach 1:
Each layer in the multi-layer construction serves multiple functions: the translucent base layer provides both structural support and light diffusion; the opaque stencil layers simultaneously define symbol boundaries and block lateral light; the semi-opaque layers enhance contrast while maintaining visibility. This multi-functionality justifies the increased structural complexity by delivering superior optical performance.
Solution Approach 2:
The patent employs composite material structures combining translucent, opaque, and semi-opaque materials in a layered arrangement. This composite approach optimizes light interaction at each interface, achieving uniform brightness and eliminating cross-talk through the synergistic properties of different material types rather than relying on a single complex material.
3Adaptability or versatility
If computer systems are used to control display panels, then dynamic display capabilities are achieved, but reliability decreases due to potential system failures
Solution Approach 1:
The display panel is designed as a passive optical system that requires no active control or power supply during operation. Symbols are revealed simply by illuminating the translucent base layer, eliminating dependencies on computer systems, software, or electronic control circuits. This self-service approach ensures high reliability while maintaining adaptability through physical layer configuration.
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 provides a compact, cost-efficient, and flexible display panel with uniform brightness and constant directivity, minimizing cross-talk and resistance to cracking and delamination, ensuring reliable operation without computer system dependency.
Implementation Method 1
translucent layer... on the macroscopic scale does not follow Snell's law providing diffuse reflection of light characterized by omni-directional reflection angles within the volume thereof
Implementation Method 2
opaque stencil layer... opaque crosstalk reduction layer... operable to block light from the light source
Implementation Method 3
illuminated from the back side of the panel... light from the light source to pass through the translucent base layer
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a display panel (3), in particular for use in an automotive vehicle, having a front side to present displayed symbol (5) to a user and a back side apt to be illuminated by a light source (4), in order to achieve uniform brightness of displayed symbols (5) with substantially constant directivity and homogeneity, as well as to reduce cross talk between separate symbols (5) the display panel (3) has a layered arrangement comprising a translucent solid base layer (31); an opaque stencil layer (32) adjoining the front side of said translucent base layer (31) and including voids (321) representing symbols (5) displayable at the front side of the panel (3) when illuminated from the back side of the panel (3); an opaque crosstalk reduction layer (33) adjoining the back side of said translucent base layer (31) and including voids (331) corresponding to said voids (321) of said stencil layer (32) or to the symbols (5) defined by said voids (321) of said stencil layer; and a semi-opaque layer (34) adjoining the front side of said stencil layer (32), The invention relates also to a display assembly (1) comprising a housing (2) having a number of chambers (21) opening at the front face (22) of the housing, at least one light source (4) disposed in at least one of said chambers (21), and such a display panel (3) fixed to said front face (21) of said housing (2).