PSVA LCD Pixel Electrode Trench Depth Optimization
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Solution Overview
Problem
PSVA liquid crystal display panels face issues with uneven electrical fields and brightness due to non-uniform trench patterns on the passivation layer, leading to uncertainty in optimal trench depth for best optical performance and increased process complexity.
Innovation Solution
A PSVA liquid crystal display panel with a patterned passivation layer featuring trenches of uniform depth (2000-4000 Å) and a continuous, uniform pixel electrode, where the passivation layer is divided into sub-areas with a pozidriv pattern, using Silicon Nitride and ITO materials, and a common electrode with a uniform thickness, to enhance transmittance and optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pixel electrode is processed to have a pozidriv pattern, then the liquid crystal molecules can be induced to lie down toward different directions, but the nonuniform electrical field causes uneven brightness phenomenon
Solution Approach 1:
The passivation layer is divided into different regions (first passivation region and second passivation region) with different trench depths. The first passivation region has deeper trenches than the second passivation region, creating local variations in the electrical field distribution to compensate for the nonuniformity caused by the pozidriv pattern and achieve uniform brightness across the pixel.
2Manufacturing precision
If different trench depths are used in the passivation layer, then optical performance can be optimized, but the process complexity increases and production efficiency decreases
Solution Approach 1:
The passivation layer is segmented into different regions with different trench depths to optimize optical performance in specific areas without requiring the entire passivation layer to have complex variable depths. This selective segmentation maintains production efficiency while achieving the desired optical characteristics.
3Adaptability or versatility
If the pixel electrode is processed to have a pozidriv pattern, then the tilt electric field can be induced, but the process area increases and production time extends
Solution Approach 1:
The passivation layer trenches are pre-formed with specific depth variations before the liquid crystal alignment process. This preliminary structuring of the passivation layer provides built-in control over the electrical field distribution, reducing the need for extensive process tuning and extending production time.
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 results in higher transmittance and improved optical performance while simplifying the production process, reducing process tuning time, and increasing production efficiency by standardizing trench depth and electrode thickness.
Implementation Method 1
the tilt electric field can induce the liquid crystal molecules in different areas to lie down toward different directions
Implementation Method 2
the birefraction difference of the liquid crystal molecules is larger
Data Source
AI summary
The present invention provides a PSVA liquid crystal display panel, comprising an upper substrate (1), a lower substrate (2) oppositely located to the upper substrate (1) and a liquid crystal layer (3) located between the upper substrate (1) and the lower substrate (2); the lower substrate (2) comprises a second substrate (21), a thin film transistor, a passivation layer (22) and a pixel electrode (23); the lower substrate (2) comprises a plurality of pixel areas, and the passivation layer (22) is a passivation layer which is patterned, and is respectively formed the same pattern corresponding to the plurality of pixel areas, and the pattern comprises a plurality of trenches (221) extending toward various directions; the pixel electrode (23) is entirely attached to the passivation layer (22) which is patterned and comprises a corresponding pattern with the passivation layer (22); a depth of the trench (221) is 2000-4000 Å. The PSVA liquid crystal display panel of the present invention possesses higher transmittance and excellent optical performance.