Planar Photoluminescent Lamp Segmented Channel Design
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Solution Overview
Problem
Conventional planar fluorescent lamps face inefficiencies due to small electrode contact areas, leading to increased impedance, higher operating voltage, ozone generation, pin-holes, and reduced light emission efficiency.
Innovation Solution
The design features channels with distinct capacitive and resistive portions, along with shoulder portions, to increase the electrode contact area, thereby enhancing the effective capacitance and reducing impedance, allowing for improved light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the channel width is reduced to improve light emission efficiency, then the light emission efficiency increases, but the electrode contact area decreases leading to increased impedance and higher operating voltage
Solution Approach 1:
The channel is divided into three distinct portions: a first capacitive portion at the electrode interface with larger width, a resistive portion in the middle with smaller width, and a second capacitive portion at the other electrode interface with larger width. This segmentation allows each portion to serve its specific function - the capacitive portions provide large contact area for low impedance while the resistive portion maintains thin width for high light emission efficiency.
Solution Approach 2:
Different portions of the channel have different width characteristics tailored to their specific functions. The capacitive portions have larger width (Ac) to maximize electrode contact area and reduce impedance, while the resistive portion has smaller width (Ar) to maintain thin channel thickness for efficient light emission. This local optimization resolves the contradiction between these two requirements.
2Object-affected harmful factors
If the electrode contact area is increased to reduce impedance, then the impedance decreases and light emission efficiency improves, but the channel structure becomes more complex
Solution Approach 1:
The channel structure is segmented into three portions with different width characteristics. This segmentation naturally incorporates the capacitive effects at the electrode interfaces without requiring additional external components, thus reducing overall system complexity while achieving the desired impedance reduction.
Solution Approach 2:
The channel structure serves multiple functions simultaneously: it provides the discharge path for electrical current, acts as a capacitor through its widened portions at the electrodes, and maintains the thin geometry needed for efficient light emission. This multi-functionality eliminates the need for separate components and simplifies the overall device structure.
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 increased electrode contact area reduces impedance, leading to more efficient light production and reduced operating voltage, minimizing ozone generation and pin-holes, resulting in enhanced light emission efficiency.
Implementation Method 1
The relationship of the impedance Xc of the lamp channel 820 and the effective capacitance C is determined by Xc=1/(jωC), wherein j is the imaginary number and ω is the frequency of the current passing through the lamp channel 820. Accordingly, decreasing the effective capacitance C results in increasing the impedance Xc.
Implementation Method 2
a planar photoluminescent lamp for use in a liquid crystal display system
Data Source
AI summary
A planar photoluminescent lamp. In one embodiment, the planar photoluminescent lamp includes a plurality of barrier walls defining a plurality of channels, wherein each channel is with an axis and formed with a resistive portion characterized by a width, Ar, and a first capacitive portion and a second capacitive portion both characterized by a width, Ac, such that Ac>Ar. The planar photoluminescent lamp also includes a first electrode and a second electrode. The first electrode and the second electrode are substantially perpendicular to the axis of a channel and extend over the first capacitive portions and the second capacitive portions of the plurality of channels, respectively.