Vehicular Lamp Liquid Crystal Element Insulating Layer
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Solution Overview
Problem
Conventional vehicular lamps with liquid crystal elements face issues such as dark lines in light distribution patterns due to gaps between pixel electrodes, which are difficult to minimize without increasing manufacturing costs or causing short circuits, and thin wiring leading to resistance and disconnection problems.
Innovation Solution
A vehicular lamp design featuring a liquid crystal element with a matrix arrangement of segment electrodes whose widths gradually narrow and widen, overlapping 80% of the gaps between pixel electrodes, and an insulating layer covering wiring electrodes to ensure effective voltage application and reduce dark regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the gap between adjacent pixel electrodes is reduced to minimize dark lines, then the appearance of light distribution pattern is improved, but manufacturing cost increases and short circuit risk increases
Solution Approach 1:
The patent introduces an insulating layer as an intermediary substance between adjacent pixel electrodes. This insulating layer physically separates the electrodes while allowing the gap to be reduced for better appearance, preventing short circuits without requiring excessive spacing that would degrade image quality.
Solution Approach 2:
The patent changes the electrical insulation parameter by introducing a material layer (insulating layer) rather than relying solely on geometric spacing. This allows the physical gap to be minimized for image quality while the insulation parameter is maintained through the material property of the insulating layer.
2Device complexity
If the wiring portion width is reduced to minimize space occupation, then the device complexity is reduced, but resistance value increases and disconnection probability increases
Solution Approach 1:
The insulating layer acts as a mediator that allows thin wiring portions to be laid out densely without causing short circuits. The wiring can be made thinner to reduce device complexity and improve resolution, while the insulating layer ensures electrical isolation is maintained despite the reduced spacing.
3Illumination intensity
If the gap between pixel electrodes is reduced to improve image quality, then dark lines are minimized, but manufacturing precision requirements increase
Solution Approach 1:
The insulating layer serves as a manufacturing intermediary that can be applied as a continuous film, providing consistent insulation even when the exact gap dimensions vary. This relaxes the manufacturing precision requirements for the gap itself, as the insulating layer material compensates for dimensional variations.
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 design improves the appearance of light distribution patterns by minimizing dark lines and ensuring reliable voltage application, enhancing the overall performance and manufacturing efficiency of vehicular lamps.
Implementation Method 1
a liquid crystal element configured to control transmission of light emitted from the light source in accordance with a light distribution pattern for a vehicular lamp
Implementation Method 2
an electrooptic element having a light control function
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A vehicular lamp includes: a light source (1) configured to emit light that travels in an optical path; a liquid crystal element (5) disposed on the optical path of light emitted from the light source (1), and including a liquid crystal layer and a pair of sandwiching substrates (11, 12) configured to sandwich the liquid crystal layer; and a projection optical system (7) disposed on the optical path of light having been transmitted through the liquid crystal element. In the vehicular lamp, one of the pair of sandwiching substrates (11, 12) in the liquid crystal element includes a first transparent substrate (11), and a common electrode (13) disposed on the first transparent substrate, and the other of the pair of sandwiching substrates (11, 12) in the liquid crystal element (5) includes a second transparent substrate (12), a plurality of wiring electrodes (16) disposed on the second transparent substrate (12), an insulating layer (17) disposed on the second transparent electrode (12) to cover the plurality of wiring electrodes (16), a plurality of segment electrodes (14) disposed on the insulating layer (17), and a plurality of connection electrodes (20a, 20b, 20c) configured to electrically connect each of the plurality of wiring electrodes (16) to each of the plurality of segment electrodes (14) while penetrating through the insulating layer (17).