Backlight Unit Shielding Part Reduces Leakage Current
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Solution Overview
Problem
The direct type backlight unit in liquid crystal display devices experiences significant leakage current due to high capacitance between the common electrode and the external electrode of the lamps, leading to inefficiencies in power supply.
Innovation Solution
Incorporating a shielding part within the lower side support of the backlight unit to reduce the capacitance between the common electrode and the external electrode of the lamps, while maintaining effective electrical contact through a modified common electrode design with a reduced number of clips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common electrode is installed close to the external electrode of the lamp for effective electrical contact, then electrical connection reliability is improved, but capacitance between the electrodes increases causing higher leakage current
Solution Approach 1:
A shielding part is introduced as an intermediary component between the common electrode and the external electrode of the lamp. This shielding part acts as a mediator that reduces the capacitance between the two electrodes while allowing the common electrode to maintain its electrical connection function. The shielding part effectively blocks the capacitive coupling path, thereby reducing leakage current without compromising electrical connection reliability.
Solution Approach 2:
The lower side support is divided into multiple functional parts: a support part that holds the common electrode and a shielding part that reduces capacitance. This segmentation allows the common electrode to be positioned close to the lamp's external electrode for reliable electrical contact, while the separate shielding part independently performs the function of reducing capacitive coupling and leakage current.
2Reliability
If the common electrode is positioned close to the lamp electrode for stable voltage supply, then power supply stability is improved, but capacitance increases leading to higher leakage current
Solution Approach 1:
The shielding part serves as a mediator that enables the common electrode to be positioned close to the lamp's external electrode for stable voltage supply, while simultaneously reducing the capacitive coupling between them. This intermediary structure allows the system to achieve both voltage stability and low leakage current by blocking the capacitive path without affecting the electrical connection for power supply.
3Reliability
If multiple metal clips are used to connect the common electrode to the lower side support, then electrical contact area is increased improving conductivity, but device complexity increases
Solution Approach 1:
The common electrode and the shielding part are merged into a single integrated component. This merging eliminates the need for separate metal clips to connect the common electrode to the lower side support, as the integrated structure provides both electrical connection and shielding functions in one piece, thereby reducing device complexity while maintaining electrical conductivity.
Solution Approach 2:
The integrated common electrode-shielding part structure performs multiple functions simultaneously: it provides electrical connection to the lamp, acts as a shield to reduce capacitance and leakage current, and serves as a support element. This multi-functionality replaces the need for multiple separate components (common electrode, clips, shielding structure), simplifying the overall device design.
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 configuration effectively minimizes leakage current by reducing the capacitance and ensuring smooth voltage supply to the lamps, enhancing the overall efficiency and reliability of the backlight unit.
Implementation Method 1
there is a problem in that a large leakage current is generated because of a high capacitance between the common electrode 108 and the external electrode 106A of the lamp 106
Data Source
AI summary
This relates to a backlight unit that is adaptive for reducing leakage current. A backlight unit according to an embodiment of the present invention includes: a plurality of lamps; a common electrode electrically connected to an electrode of any one of the lamps; and a lower side support that supports the common electrode and that includes a shielding part, wherein the shielding part is in between a portion of the common electrode and the electrode.