LCD Panel Aperture Ratio via Segmented Black Matrix Shielding
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Solution Overview
Problem
Existing LCD panels face issues with non-uniform electric fields and light leakage due to overlapping regions between color resist films, leading to reduced aperture ratio, which is exacerbated by the need for black matrices to shield these areas, further decreasing the aperture ratio.
Innovation Solution
The solution involves arranging black matrices only on positions corresponding to the scanning line and channel, with a planarization layer and transparent conductive layers covering most of the overlapping region, allowing the data line to shield the remaining area, thus eliminating the need for additional black matrices on the data line and increasing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If black matrices are arranged on positions corresponding to overlapping regions of color resist films, then light leakage is prevented, but aperture ratio is reduced
Solution Approach 1:
The patent segments the shielding function by dividing the overlapping region into two parts: the first part is shielded by the data line itself, while the second part is shielded by black matrices. This segmentation allows the data line to cover a portion of the overlapping region, reducing the area that requires black matrix shielding and thereby increasing the aperture ratio while still preventing light leakage.
Solution Approach 2:
The patent applies local quality by making the data line have dual functionality: it serves as both a signal transmission line and a shielding structure for the overlapping region. The data line is designed with specific width and positioning to provide shielding coverage, while black matrices are selectively placed only in the remaining uncovered portion of the overlapping region, optimizing both shielding effectiveness and aperture ratio.
2Reliability
If black matrices are arranged on positions corresponding to scanning lines, then coupling capacitance effects are mitigated, but aperture ratio is reduced
Solution Approach 1:
The patent extracts the shielding function from the black matrices and assigns part of it to the data line. By having the data line provide shielding for the overlapping region, the requirement for black matrices on scanning lines is reduced or eliminated, thereby maintaining coupling capacitance control while preserving aperture ratio.
3Area of stationary object
If data line alone is used to shield overlapping region, then aperture ratio is increased, but shielding effectiveness is insufficient
Solution Approach 1:
The shielding coverage is segmented between the data line and black matrices. The data line provides shielding for the first part of the overlapping region, while black matrices provide shielding for the second part. This segmentation ensures complete shielding effectiveness while maximizing aperture ratio by minimizing the total area occupied by shielding structures.
Data Source
AI summary
An LCD panel and an LCD device are provided. The LCD panel includes a first substrate, which includes a first metal layer, a first insulating layer, an active layer, a second metal layer, a second insulating layer, a color barrier layer, a first transparent conductive layer, a planarization layer, and a second transparent conductive layer electrically connected with the first transparent conductive layer sequentially formed. The first metal layer includes scanning lines. Black matrices are arranged on positions corresponding to scanning lines and corresponding to channels.