LCD Pixel Electrode Shielding for Light Leakage Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) devices experience light leakage due to different voltages applied to adjacent pixel parts, which affects image quality and contrast ratio.
Innovation Solution
The LCD device incorporates a specific configuration of gate lines, data lines, power lines, and switching elements, along with shield parts and connection lines, to minimize light leakage by sharing one power line among multiple pixel parts and optimizing the arrangement of pixel electrodes and data lines, thereby reducing electric field leakage and enhancing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If different voltages are applied to adjacent pixel parts to enable image display, then image display functionality is achieved, but light leakage occurs between pixel parts
Solution Approach 1:
A common power line is introduced as an intermediary structure between adjacent pixel parts. This power line serves as a reference potential that mediates the electric field distribution at pixel boundaries, preventing electric field leakage into non-display regions and thereby eliminating light leakage while preserving normal pixel operation
Solution Approach 2:
The invention establishes equipotential regions by connecting adjacent pixel parts to a common power line that maintains a constant reference voltage. This creates equal potential zones at pixel boundaries, eliminating potential differences that would otherwise cause electric field leakage and subsequent light leakage between pixel parts
2Device complexity
If separate power lines are provided for each pixel part to simplify voltage control, then voltage control is simplified, but device complexity and area increase
Solution Approach 1:
Adjacent pixel parts share a common power line instead of each having separate power lines. This merging of power supply structures reduces the total number of power lines required, decreases device complexity, and increases the aperture ratio by reducing the area occupied by non-display elements
Solution Approach 2:
The common power line serves multiple functions simultaneously: it provides power to multiple adjacent pixel parts, establishes reference potentials for electric field control, and acts as a shared structural element. This multi-functionality reduces the overall complexity of the power distribution network
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 light leakage in the black state, enhances the aperture ratio, and improves the contrast ratio and viewing angle of the LCD device.
Implementation Method 1
The LCD device includes a liquid crystal (LC) layer interposed between the display substrate and the opposite substrate. The LC molecules of the LC layer may be operated in a vertical alignment (VA) mode due to an electric field formed between the first pixel electrode and the second pixel electrode.
Implementation Method 2
applying voltages to the electric field generating electrodes to generate an electric field in the LC layer, which controls an orientation of LC molecules in the LC layer to affect a polarization of light passing therethrough
Implementation Method 3
a shield part extending from the gate line towards the data line to shield an electric field of the data line
Data Source
AI summary
A liquid crystal display device includes a substrate, a gate line, first and second data lines, a first power line, first, second, third and fourth switching elements, and first, second, third and fourth pixel electrodes. The first switching element is connected to the gate line and the first data line. The second switching element is connected to the gate line and the first power line. The third switching element is connected to the gate line and the second data line. The fourth switching element is connected to the gate line and the first power line. The first to fourth pixel electrodes are connected to the first to fourth switching elements, respectively. Thus, a light leakage may be prevented and an aperture ratio of a display substrate may be enhanced.