Projector Metal Electrode Segmentation for Shadow Reduction
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Solution Overview
Problem
Conventional projectors using indium tin oxide (ITO) as a transparent electrode face challenges with high resistance, leading to incomplete current injection and light blocking issues, which result in shadows on the screen due to the metal layer used to reduce resistance.
Innovation Solution
A projector design incorporating a light emitting device with a first and second semiconductor layer, a light emitting layer, and a third electrode with lower resistivity than the second electrode, featuring conductive sections arranged in specific pitches to cast shadows on gap regions, reducing resistance and preventing light blocking shadows on the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal layer is provided on the transparent electrode to reduce resistance, then current injection is improved, but light transmission is blocked causing shadows on the screen
Solution Approach 1:
The metal electrode is divided into multiple independent metal sections arranged in a grid pattern, with gaps between adjacent sections. This segmentation allows light to pass through the gap regions while the metal sections provide sufficient current injection pathways, resolving the contradiction between reducing resistance and maintaining light transmission.
Solution Approach 2:
Different regions of the electrode structure serve different functions: the metal sections provide low-resistance current injection zones, while the gap regions provide high-transmission light zones. This local differentiation of properties allows simultaneous optimization of both current injection and light transmission in their respective regions.
2Illumination intensity
If a transparent electrode with high resistance is used, then light transmission is maintained, but current injection becomes incomplete
Solution Approach 1:
The electrode system is segmented into transparent electrode regions for light transmission and metal section regions for current injection. This segmentation allows each component to perform its primary function effectively without compromising the other.
Solution Approach 2:
The electrode system combines transparent electrode material (such as ITO) with metal materials to create a composite structure that leverages the high transparency of the first material and the low resistance of the second material, achieving both good light transmission and current injection.
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 allows for uniform current injection and light emission across the entire light emitting region, minimizing shadows on the screen and enhancing illumination uniformity.
Implementation Method 1
a light emitting layer that is provided between the first semiconductor layer and the second semiconductor layer and that generates light by injection of a current
Implementation Method 2
a second electrode electrically connected to the second semiconductor layer, the second electrode transmits the light generated in the light emitting layer
Data Source
AI summary
A projector includes a light emitting device and a light modulator. The light emitting device includes first and second semiconductor layers respectively electrically connected to first and second electrodes, a light emitting layer generating light by having a current injected thereinto, and a third electrode connected to the second electrode. The second electrode transmits the light generated in the light emitting layer. The third electrode has less resistivity than the second electrode, and includes first conductive sections arranged in a first direction. The light modulator includes pixels, and adjacent pixels are spaced apart by gaps. The arrangement pitch of the first conductive sections in the first direction is a multiple of the arrangement pitch of the gaps in the first direction. The shadows of the first conductive sections generated by the light emitted from the light emitting device are cast onto the gaps.