LCD Array Substrate with Cross-Shaped Pixel Electrode
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Solution Overview
Problem
Conventional FFS mode liquid crystal display devices suffer from display blind areas due to irregular electric fields at electrode boundaries, leading to reduced transmittivity and display quality, especially with decreased backlight power consumption.
Innovation Solution
The array substrate design includes a pixel electrode of '“”' shape with a via hole connecting it to the drain electrode, and the data line is formed below the boundary between the '/"' portions of the pixel electrode, optimizing the electric field and expanding the light-transmitting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the pixel electrode is arranged in a '‘’' shape (finger electrodes) to form appropriate electric field, then the liquid crystal molecules can be optimized, but the electric field at the boundary between the '/" portion and the '\"' portion becomes irregular due to interaction, creating display blind areas and degrading transmittivity
Solution Approach 1:
The patent extracts and removes the problematic boundary region between the '/" and '\"' portions of the pixel electrode from the active display area. By positioning the data line below this boundary region and creating an extended electrode structure, the irregular electric field zone is separated from the pixel aperture, eliminating the display blind area while preserving the beneficial finger electrode configuration for liquid crystal alignment
Solution Approach 2:
The patent extends the pixel electrode structure into a new spatial dimension by creating an extended electrode portion that protrudes from the main pixel electrode body. This dimensional extension allows the electrode to wrap around or extend beyond the pixel aperture boundary, effectively utilizing space in a different dimension to avoid creating blind areas while maintaining the finger electrode's electric field optimization benefits
2Use of energy by stationary object
If the backlight source power consumption is decreased for environmental protection, then energy consumption is reduced, but the pixel transmittivity must be improved to maintain similar display quality
Solution Approach 1:
The patent applies local quality improvement by optimizing the electric field distribution specifically in the pixel aperture region. The finger electrode configuration creates enhanced and more uniform electric fields locally within the pixel area, improving liquid crystal alignment and light modulation efficiency. This localized optimization increases pixel transmittivity without requiring increased backlight power, thereby maintaining display quality while reducing energy consumption
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 enhances pixel transmittivity, increases display area, and improves overall display quality by minimizing display blind areas and adapting to reduced backlight power consumption.
Implementation Method 1
a via hole which is formed above the drain electrode and leads to the drain electrode
Implementation Method 2
Each pixel may comprise a TFT as a switch device, a pixel electrode, and a common electrode. The TFT comprises a gate electrode, a gate insulating layer, an active layer, a source electrode and a drain electrode
Implementation Method 3
The combination of a transparent planar electrode (common electrode) and a finger electrode can form a more appropriate electric field and optimize the arrangement of the liquid crystal molecules
Data Source
AI summary
An array substrate comprising a base substrate, a common electrode, a gate line, a data line, a thin film transistor, a passivation layer and a pixel electrode of “” shape. The thin film transistor comprises a gate electrode, an active layer, a source electrode and a drain electrode; the gate electrode is connected with the gate line; the source electrode is connected with the data line; and the drain electrode is connected with the pixel electrode. A passivation layer is formed on the source electrode, the drain electrode and the data line, and a via hole is formed in the passivation layer over the drain electrode. The pixel electrode of “” shape is formed on the passivation layer and connected with the drain electrode through the via hole in the passivation layer. The data line is provided below the position corresponding to the boundary between the “/” portion and the “\” portion of the pixel electrode of “” shape. The array substrate increases the transmittivity of pixel and improves the display quality.