Liquid Crystal Display Panel Sub-Pixel Electrode Design
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Solution Overview
Problem
Liquid crystal display panels face reduced lateral visibility due to narrow view angles and color shift issues, particularly in multi-domain patterned vertical alignment (M-PVA) mode, which can be exacerbated by methods that divide pixels into sub-pixels for gray voltage application, leading to reduced aperture ratio and increased manufacturing costs.
Innovation Solution
The liquid crystal display panel design includes a first and second sub-pixel area with a contact electrode between them, forming coupling and storage capacitors using the pixel electrode, passivation layer, and drain electrode, allowing for different voltages to be applied to sub-pixels without reducing the aperture ratio, thereby improving lateral visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pixels are divided into sub-pixels for applying different gray voltages to improve view angle, then lateral visibility is improved, but aperture ratio is reduced and manufacturing cost increases
Solution Approach 1:
The pixel electrode is divided into first and second sub-pixel electrodes corresponding to different sub-pixel areas, allowing independent voltage control for each sub-pixel. This segmentation enables different gray voltages to be applied to adjacent sub-pixels, creating multiple liquid crystal domains that improve lateral visibility and view angle without requiring physical subdivision of the pixel structure that would reduce aperture ratio.
Solution Approach 2:
Different gray voltages are applied to different sub-pixel areas within the same pixel through the respective sub-pixel electrodes. This local quality variation creates distinct liquid crystal domains with different orientation patterns, improving lateral visibility while maintaining the overall pixel structure and aperture ratio.
2Object-affected harmful factors
If multiple sub-pixel electrodes are used to improve view angle, then lateral visibility is improved, but device complexity increases
Solution Approach 1:
The first and second sub-pixel electrodes are merged into a single pixel electrode structure that can be controlled independently. Additionally, the connection electrode merges the control functions of multiple sub-pixel areas, allowing complex voltage patterns to be achieved through a unified electrode design that reduces overall device complexity.
Solution Approach 2:
The pixel electrode serves multiple functions: it acts as both the first sub-pixel electrode and the second sub-pixel electrode through different regions, and the connection electrode provides both electrical connection and voltage distribution functions. This multi-functionality reduces the number of separate components needed.
3Reliability
If sub-pixel electrodes are spaced apart to form capacitors for voltage control, then voltage stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The spacing between the first sub-pixel electrode and the connection electrode automatically forms a coupling capacitor that provides voltage stability. The geometric arrangement of the electrodes themselves creates the capacitive effect without requiring additional components or precise external adjustments, allowing the structure to self-regulate voltage stability.
Data Source
AI summary
A liquid crystal display panel having improved lateral visibility. The liquid crystal display panel includes a first substrate including a pixel electrode formed on a pixel area including a first sub-pixel area and a second sub-pixel area; and a second substrate coupled to the first substrate with a liquid crystal layer accommodated between the first substrate and the second substrate, and including a common electrode formed on an area corresponding to the pixel area, wherein the pixel electrode includes a first sub-pixel electrode formed on the first sub-pixel area; a second sub-pixel electrode formed on the second sub-pixel area; and a contact electrode formed between the first sub-pixel area and the second sub-pixel area, and wherein the first sub-pixel electrode and the contact electrode are spaced apart from each other by a predetermined distance.