Concave Substrate Light-Emitting Elements for Multi-Directional Display
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Solution Overview
Problem
Current LED display devices face challenges in displaying different images to observers on opposite sides without image signal crossing or scattering, particularly in in-vehicle applications where distinct views for drivers and passengers are required.
Innovation Solution
The design incorporates a first and second light-emitting element on a concave portion of a substrate with inclined areas, emitting light in different directions, allowing for the display of distinct images to multiple directions such as left/right and up/down, with an adhesive layer minimizing light attenuation and a light-shielding film or slits to enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different images are displayed to observers on the left and right using conventional LED display devices, then distinct views for multiple observers are achieved, but image signal crossing or scattering occurs reducing image quality
Solution Approach 1:
The display device is divided into multiple independent light-emitting element groups, where each group corresponds to a specific viewing direction. This segmentation allows different images to be displayed to different observers without signal interference, as each group independently controls light emission for its designated viewing angle.
Solution Approach 2:
Different regions of the display device are assigned different light-emitting elements with specific emission characteristics tailored to local viewing requirements. The light-emitting elements are selectively arranged and configured to emit light in specific directions, creating local optimization for each viewing zone while maintaining overall system functionality.
2Adaptability or versatility
If light-emitting elements are arranged to emit light in different directions for multiple viewing angles, then distinct images for left/right and up/down directions are achieved, but light attenuation occurs reducing visibility
Solution Approach 1:
A light-shielding film is introduced as an intermediary component between the light-emitting elements and the external environment. This film selectively blocks light in unwanted directions while allowing light to pass through in desired viewing directions, thereby controlling light distribution and reducing attenuation without compromising the ability to display images in multiple directions.
Solution Approach 2:
The light-shielding film utilizes optical properties including absorption and reflection characteristics to modulate light transmission. By selecting materials with specific optical properties, the film can selectively attenuate light in certain directions while maintaining high transmission in viewing directions, effectively managing light intensity distribution.
3Reliability
If a light-shielding film is added to prevent light scattering and enhance visibility, then image clarity for multiple directions is improved, but device complexity increases
Solution Approach 1:
The light-shielding film serves multiple functions simultaneously: it shields light in unwanted directions, enhances contrast by blocking ambient light interference, and maintains mechanical integrity of the display structure. This multi-functionality justifies the added component by providing multiple benefits from a single element, thereby managing complexity through functional consolidation.
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 enables high visibility and effective display of different images to multiple directions, suitable for in-vehicle applications by minimizing light attenuation and preventing signal crossing, thereby improving the viewing experience for drivers and passengers.
Implementation Method 1
a first light-emitting element and a second light-emitting element, located in the concave portion... the first light-emitting element emitting light to have a peak emission intensity in a first direction and the second light-emitting element emitting light to have a peak emission intensity in a second direction
Implementation Method 2
an adhesive layer minimizing light attenuation
Implementation Method 3
a light-shielding film or slits to enhance visibility... preventing signal crossing
Data Source
AI summary
According to one embodiment, a display device includes a first insulating substrate including a first surface, a second surface on an opposite side to the first surface and a concave portion located in the second surface, and a first light-emitting element and a second light-emitting element, located in the concave portion, and an inner wall of the concave portion includes a first inclined area and a second inclined area opposing the first inclined area, the first light-emitting element being located on the first inclined area, and the second light-emitting element being located on the second inclined area.