Projector Light-Guide Spacing for Wire Reliability and Light Efficiency
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Solution Overview
Problem
Existing projectors face issues with wire disconnection or short circuits due to intimate contact between light sources and blocks, leading to decreased light efficiency, and there is a need to prevent these while maintaining high light use efficiency.
Innovation Solution
A projector design with a first light source, light guide, parallelizing element, and light modulator, where the light guide is disposed away from the electrically conducting line, and the distance between the light incident end and the light source is less than or equal to 0.7 mm, ensuring efficient light homogenization and modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light sources and blocks are arranged in intimate contact to improve light use efficiency, then light efficiency is improved, but wire disconnection or short circuit risk increases
Solution Approach 1:
The patent introduces a support member as an intermediary component between the light emitting device and the block. The support member includes a light emitting device mounting portion that holds the light emitting device and an electrically insulating layer that prevents direct contact between the wire and the block, thereby eliminating the short circuit risk while maintaining intimate contact for efficient light transmission
Solution Approach 2:
The support member is divided into functional segments: a mounting portion for the light emitting device, an electrically insulating layer for electrical isolation, and a light transmitting portion for efficient light transmission. This segmentation allows each component to perform its specific function without interfering with others, resolving the contradiction between electrical isolation and optical efficiency
2Reliability
If light sources and blocks are arranged separately to prevent wire disconnection or short circuit, then wire connection reliability is improved, but light use efficiency decreases
Solution Approach 1:
The support member acts as a mediator that enables both electrical isolation and optical efficiency simultaneously. The electrically insulating layer provides the necessary separation for reliability, while the light transmitting portion maintains the optical path integrity for high light use efficiency
Solution Approach 2:
The support member merges multiple functions into a single integrated component: mechanical support for the light emitting device, electrical insulation to prevent short circuits, and light transmission to maintain efficiency. This integration eliminates the need to choose between reliability and efficiency
3Ease of manufacture
If wire bonding is used to couple light emitting device to electrode, then electrical connection is achieved, but wire disconnection or short circuit risk is introduced
Solution Approach 1:
The electrically insulating layer on the support member serves as an intermediary that prevents harmful contact between the wire and the block while allowing the wire to maintain its electrical connection function. This eliminates the short circuit risk without complicating the wire bonding process
Solution Approach 2:
The electrically insulating layer is provided in advance on the support member before wire bonding, creating a protective barrier that prevents future short circuit issues. This beforehand protection ensures long-term reliability without affecting the ease of manufacturing
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 effectively prevents wire disconnection and short circuits while maintaining high light efficiency by optimizing the distance and configuration of light components, enhancing the projector's performance.
Implementation Method 1
a first light guide having a first light incident end on which the first light output from the first light source is incident and a first light exiting end via which the first light exits, the first light guide configured to homogenize in-plane illuminance of the first light
Implementation Method 2
a first parallelizing element configured to parallelize the first light output from the first light guide
Data Source
AI summary
A projector according to an embodiment of the present disclosure includes a first light source including a first light emitting device configured to emit first light having a first wavelength band, a first electrically conducting line configured to supply the first light emitting device with electric power, and a base configured to support the first light emitting device and the first electrically conducting line; a first light guide having a first light incident end on which the first light output from the first light source is incident and a first light exiting end via which the first light exits, the first light guide configured to homogenize in-plane illuminance of the first light; a first parallelizing element configured to parallelize the first light output from the first light guide; a first light modulator configured to modulate the first light output from the first parallelizing element based on image information; and a projection system configured to project the light modulated by the first light modulator. The first light guide is disposed away from the first electrically conducting line, and a first distance between the first light incident end of the first light guide and the first light source is smaller than or equal to 0.7 mm.