Backlight Frame Aperture Reduces Parasitic Capacitance
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Solution Overview
Problem
Conventional direct-type backlight modules experience reduced luminance efficiency due to parasitic capacitance and leakage current between the high voltage electrode terminal of the light source and the metal frame, which affects the luminance quality and practicality of LCD devices.
Innovation Solution
The design involves hollowing the overlapped region of the frame under the high voltage electrode terminal to create a through aperture, positioning the electrode terminal above this aperture, thereby reducing parasitic capacitance and leakage current, and enhancing the luminance efficiency and voltage stability of the light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the frame is made as a metal conductor for structural support, then the structural strength is improved, but parasitic capacitance and leakage current occur between the electrode terminal and the frame, reducing luminance efficiency
Solution Approach 1:
The patent extracts the problematic overlapping region between the electrode terminal and the frame by creating a through aperture in the frame. This removes the parasitic capacitance formation area while preserving the frame's structural integrity in other regions.
Solution Approach 2:
The frame is segmented by introducing a through aperture that divides the continuous metal structure into separate regions. This segmentation eliminates the capacitive coupling path between the electrode terminal and the frame while maintaining overall structural support.
2Power
If high voltage is applied to the electrode terminal to drive the light source, then the light output is improved, but leakage current increases due to parasitic capacitance with the frame, reducing voltage stability
Solution Approach 1:
The through aperture extracts the source of parasitic capacitance (the overlapping frame region), thereby eliminating the leakage current path that would otherwise destabilize the high voltage supply to the electrode terminal.
3Ease of manufacture
If the frame structure is made continuous for manufacturing simplicity, then the ease of manufacture is improved, but the parasitic capacitance between electrode terminal and frame increases, reducing luminance quality
Solution Approach 1:
The continuous frame structure is modified by extracting the overlapping region through the aperture, reducing parasitic capacitance while maintaining the overall continuity and simplicity of frame 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
This design increases the luminance efficiency and stability of the backlight module, improving the luminance quality and practicality of the LCD device by minimizing parasitic capacitance and leakage current.
Implementation Method 1
parasitic capacitance or stray capacitance would occur between the electrode terminal of the lamp and the frame when a high voltage is applied to the lamp
Implementation Method 2
the cold cathode fluorescent lamp (CCFL) is disposed in a lateral side of the LCD panel. The light emitted by the CCFL
Data Source
AI summary
A backlight module and a liquid crystal display (LCD) device incorporating the same are provided. The backlight module includes a frame and at least a light source. The frame has at least a through aperture. The light source having at least a t high voltage electrode terminal is disposed above the frame. The high voltage electrode terminal is positioned above the through aperture.