Movable Light Shielding for High-Definition Light Distribution
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Solution Overview
Problem
Existing light emitting devices lack the ability to achieve high definition in light distribution and control, particularly in controlling light emission patterns and colors effectively.
Innovation Solution
A light emitting device with a movable light shielding member that has openings corresponding to light emitting parts, allowing for controlled light emission by adjusting the position of the shielding member to create pseudo light emitting surfaces, enabling high definition light distribution and multi-color emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a plurality of LEDs are two-dimensionally mounted on a substrate at a high density, then the light emitting device can achieve high definition, but the device complexity and control difficulty increase
Solution Approach 1:
The patent divides a single light emitting surface into multiple pseudo light emitting surfaces by using a light shielding member with multiple openings. Each opening corresponds to a specific region, allowing independent control of light emission in different areas. This segmentation approach achieves high definition light distribution without requiring multiple separate LED elements, thereby reducing device complexity while maintaining manufacturing precision.
Solution Approach 2:
The light shielding member acts as an intermediary between the light source and the external environment. By positioning the light shielding member above the light emitting surface and controlling the positions of its openings, the system can modulate light emission patterns without directly controlling multiple individual LEDs. This intermediary mechanism simplifies the control system while achieving precise light distribution.
2Ease of operation
If a light shielding member is used to control light emission patterns, then light distribution control is improved, but the device complexity increases
Solution Approach 1:
The light shielding member serves multiple functions simultaneously: it shields unwanted light, defines emission patterns, creates pseudo light emitting surfaces, and enables color control by positioning openings over different wavelength conversion regions. This multi-functionality improves ease of operation without requiring separate components for each function, thereby limiting the increase in device complexity.
Solution Approach 2:
The light shielding member is designed to be movable, allowing dynamic adjustment of opening positions to create different light emission patterns and control light distribution in real-time. This dynamic capability provides flexible ease of operation while using a single movable component rather than multiple static elements, balancing operational flexibility with device complexity.
3Loss of energy
If openings in the light shielding member overlap with light emitting surface, then light utilization efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The light shielding member features multiple openings with different positions and sizes, each optimized for specific regions of the light emitting surface. Each opening is locally tailored to match the characteristics of the underlying LED and wavelength conversion layer, maximizing light extraction efficiency in each region. This local optimization approach improves overall light utilization while distributing positioning requirements across multiple standardized opening designs.
Solution Approach 2:
The system controls light emission by changing the positional parameters of the light shielding member and its openings relative to the light emitting surface. By adjusting the distance and lateral position of the light shielding member, the system can optimize light utilization efficiency without requiring extremely high manufacturing precision in the opening dimensions themselves, as the positional parameters provide the primary control mechanism.
Data Source
AI summary
A light emitting device includes a light source having a light emitting surface, and a light shielding member located above the light source and having an opening. The light shielding member is movable between (i) a first position in which the opening overlaps the light emitting surface of the light source in a top view, and (ii) a second position, different from the first position, in which the opening overlaps the light emitting surface of the light source in the top view. Light emission of the light source is controllable under a first condition when the light shielding member is in the first position, and is controllable under a second condition when the light shielding member is in the second position.