LCD Black Matrix Segmentation and Metal Interlayer for Light Leakage
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Solution Overview
Problem
Liquid crystal display (LCD) devices experience light leakage due to the vulnerability of green subpixel pigments to electric fields, which can occur even without an applied electric field, and existing solutions like extending a guide panel do not completely prevent light leakage across all viewing angles.
Innovation Solution
The LCD device incorporates a display panel with a first black matrix in the active area and a second black matrix spaced apart from it, along with a metal layer in the gap between them, to prevent electric charge transfer and absorb backlight light, thereby preventing liquid crystal molecule malfunction and light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guide panel is extended toward the surroundings of the active area to prevent light leakage, then light leakage prevention is improved, but light leakage still occurs depending on viewing angles
Solution Approach 1:
The black matrix is divided into two distinct parts: a first black matrix within the active area and a second black matrix in the non-active area, spaced apart from each other. This segmentation allows each part to perform its function independently, preventing light leakage while maintaining viewing angle adaptability without requiring an extended guide panel
Solution Approach 2:
A metal layer is introduced as an intermediary element disposed between the first and second black matrices. This metal layer acts as a mediator that absorbs backlight light and prevents electric charge transfer, effectively blocking light leakage paths while maintaining the spaced-apart configuration of the black matrices
2Area of stationary object
If the second black matrix is positioned close to the first black matrix to maximize active area, then active area is improved, but electric charges can transfer to the first black matrix causing light leakage
Solution Approach 1:
The metal layer serves as an intermediary barrier between the first and second black matrices. It is disposed in the gap between them to prevent electric charges from transferring from the second black matrix to the first black matrix, thereby preventing light leakage while allowing the black matrices to be positioned close together to maximize active area
Solution Approach 2:
The harmful function of the second black matrix (attracting electric charges that could transfer to the first black matrix) is extracted by introducing the metal layer. The metal layer absorbs the electric charges and backlight light, removing the harmful effect while preserving the close positioning of the black matrices for maximum active area
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 prevents light leakage regardless of viewing angles by isolating the first black matrix from external electric charges and absorbing light emitted from the backlight, ensuring stable image display.
Implementation Method 1
a metal layer disposed to correspond to an area between the plurality of first black matrices and the second black matrix
Data Source
AI summary
A liquid crystal display device includes a display panel having an active area and a non-active area; a first black matrix in the active area; a second black matrix on at least a peripheral portion of the display panel and the second black matrix spaced apart from the first black matrix, and the second black matrix positioned in the active area and a portion of the non-active area; and an opaque layer corresponding to a gap between the first black matrix and the second black matrix.