Floating Shield Metal Line Blocks Light Leakage in AMLCD Panels
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Solution Overview
Problem
Existing AMLCD panels experience light-leakage issues due to liquid crystal molecules aligning parallel to the substrates in certain areas, leading to impaired images, which can only be mitigated by increasing the black matrix width, thereby reducing the aperture ratio.
Innovation Solution
Incorporating a floating second shield metal line that is not electrically connected to any component, preventing voltage application and maintaining liquid crystal molecules perpendicular to the substrates, thus blocking light leakage without compromising the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the black matrix width is increased to block light leakage, then light leakage is reduced, but the aperture ratio is reduced
Solution Approach 1:
The patent divides the shielding function into two parts: the common line (electrically connected) and the floating shield metal line (not electrically connected). This segmentation allows each component to perform its shielding function independently, achieving complete light blocking without requiring an increased black matrix width, thus preserving the aperture ratio.
Solution Approach 2:
The floating shield metal line acts as an intermediary element between the common line and the pixel electrode. It provides additional shielding capability in the light leakage area without being electrically connected to external components, effectively blocking light while maintaining the original aperture ratio.
2Object-affected harmful factors
If the black matrix width is increased to block light leakage, then light leakage is reduced, but the display area is reduced
Solution Approach 1:
The shielding function is segmented between the common line and the floating shield metal line, allowing effective light blocking to be achieved within the existing display area without requiring an expansion of the black matrix that would reduce the display area.
Solution Approach 2:
The patent adds a new dimension to the shielding structure by introducing the floating shield metal line that extends in a direction different from the common line. This dimensional addition provides enhanced shielding capability without increasing the overall footprint or reducing the display area.
3Manufacturing precision
If the alignment layers are configured with specific groove directions (ten o'clock and one o'clock), then liquid crystal alignment is improved, but manufacturing complexity increases
Solution Approach 1:
The alignment layers are configured with specific groove directions (ten o'clock for the first alignment layer and one o'clock for the second alignment layer) to create optimal local alignment conditions in the light leakage area. This local optimization of groove orientation improves liquid crystal alignment precision without requiring complex overall structural changes.
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 floating second shield metal line effectively blocks light leakage, maintaining image quality without reducing the aperture ratio, as liquid crystal molecules remain perpendicular to the substrates, ensuring optimal display performance.
Implementation Method 1
the floating second shield metal line that is not electrically connected to any component, preventing voltage application and maintaining liquid crystal molecules perpendicular to the substrates
Implementation Method 2
a first alignment layer formed on the common electrode layer and including a plurality of first grooves that extend along a ten o'clock direction, and a second alignment layer adjacent to the liquid crystal layer and including a plurality of second grooves that extend along a one o'clock direction
Data Source
AI summary
An exemplary active matrix liquid crystal display (AMLCD) panel (20) includes a first substrate (400), a second substrate (600), and a liquid crystal layer (500) sandwiched between the two substrates. The second substrate includes gate lines that are parallel to each other, common lines that are alternate with and parallel to the gate lines, and data lines that are parallel to each other and crossing to the gate lines. The data lines cross the gate lines to define pixel regions. Each of the pixel regions includes a pixel electrode that is between the data lines, a first shielding metal line positioned at a side of the pixel electrode, a second shielding metal line positioned at another side of the pixel electrode. The second shielding metal line is connected to the common line. The first shielding metal line is an electrically floating body.