LCD Array Substrate Layout for Shielded Data Lines and Higher Aperture
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Solution Overview
Problem
Conventional liquid crystal display devices suffer from low aperture ratios and transmittance due to the occupation of space by opaque shielding lines and data lines on both sides of the pixels.
Innovation Solution
The array substrate design includes a base substrate with a first metal layer, a second metal layer containing data lines, and a pixel electrode layer with trunk and branch electrodes. Shielding electrodes are strategically placed between data lines and pixel electrodes, overlapping with the trunk electrodes to shield coupling effects, thereby optimizing space usage and increasing aperture ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shielding lines and data lines are arranged on both sides of pixels, then coupling effect between data line and pixel electrode is reduced, but aperture ratio of pixel is lowered
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement where shielding lines are placed on both sides of pixels to a three-dimensional overlapping arrangement. The shielding electrode is positioned to overlap with the trunk electrode in the vertical dimension, allowing the data line to pass through the pixel area without occupying lateral space. This dimensional change enables the shielding function to be achieved while maintaining high aperture ratio.
Solution Approach 2:
The patent merges the shielding electrode with the pixel electrode structure by making the shielding electrode overlap with the trunk electrode. This integration allows the shielding function to be achieved using the existing pixel electrode material and structure, eliminating the need for separate shielding lines on both sides of the pixel and thereby increasing the aperture ratio.
2Reliability
If opaque shielding lines are used to shield data signals, then coupling effect is reduced, but transmittance of display panel is lowered
Solution Approach 1:
The patent changes the material parameter of the shielding electrode from opaque metal to transparent conductive material. This parameter change allows the shielding electrode to maintain its electrical shielding function while becoming transparent to light, thereby improving the transmittance of the display panel. The transparent conductive material enables the shielding electrode to block electromagnetic coupling while allowing optical transmission.
Data Source
AI summary
An array substrate and a liquid crystal display panel are provided. A shielding electrode is at least arranged between a data line and a pixel electrode. On a base substrate, an orthogonal projection of the shielding electrode and an orthogonal projection of the data line both overlap with an orthogonal projection of a portion of a trunk electrode extending along a direction of a data line, so that the shielding electrode shields a coupling effect between the data line and the pixel electrode. By arranging the data line and the shielding electrode in an area corresponding to the trunk electrode of a pixel electrode, less space or no space are occupied by the shielding electrode and the data line. The present application increases an aperture ratio of the pixel and increases a transmittance of the display panel.