Liquid Crystal Display Common Electrode Opening for Transmittance
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with side visibility due to poor control of liquid crystal molecule alignment, leading to luminance differences and transmittance reduction caused by conventional notch structures used to manage liquid crystal movement.
Innovation Solution
Defining openings in the common electrode or pixel electrode to alter the direction of liquid crystal molecules, increasing the horizontal electric field between electrodes and eliminating the need for notches, thereby improving transmittance and controlling liquid crystal movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional notch structures are used to manage liquid crystal movement, then liquid crystal alignment is improved, but transmittance is reduced
Solution Approach 1:
The invention extracts and eliminates the notch structures from the electrode design. Instead of using notches to control liquid crystal molecules, the patent employs openings in the common electrode or pixel electrode that achieve the same alignment control function without the transmittance-reducing effects of conventional notches
Solution Approach 2:
The invention inverts the conventional approach by placing openings in the common electrode or pixel electrode rather than using notches in the traditional electrode structure. This reversal allows for effective liquid crystal control while maintaining high transmittance, as the openings are strategically positioned to influence molecular alignment without blocking light paths
2Loss of energy
If openings are defined in common electrode or pixel electrode to increase horizontal electric field, then transmittance is improved, but device complexity increases
Solution Approach 1:
The openings in the common electrode or pixel electrode serve multiple functions simultaneously: they generate the horizontal electric field needed for liquid crystal alignment, they maintain high transmittance by minimizing light blocking, and they simplify the overall electrode design by eliminating the need for separate notch structures. This multi-functionality reduces device complexity despite the added feature
3Stability of the object's composition
If pixel electrode branches are separated to control liquid crystal movement, then luminance uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention applies local quality by creating specific openings in strategic locations within the common electrode or pixel electrode. These localized openings are positioned to influence liquid crystal alignment in specific regions, ensuring uniform luminance across the display while maintaining manufacturability through precise but achievable positioning requirements
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
The solution enhances the horizontal electric field, reduces luminance deterioration, and improves transmittance by eliminating the transmittance-reducing effects of conventional notch structures, resulting in better side visibility and display performance.
Implementation Method 1
an opening is defined in a common electrode at a position that corresponds to a middle region of a pixel branch electrode... to increase a horizontal electric field between the common electrode and the pixel electrode
Data Source
AI summary
A liquid crystal display includes a first substrate, a gate line disposed on an upper portion of the first substrate, a gate insulating layer disposed on the gate line, a semiconductor layer disposed on the gate insulating layer, a data line and a drain electrode disposed on the semiconductor layer, a passivation layer which covers the data line and the drain electrode and defines a contact hole which exposes a part of the drain electrode, a common electrode provided at an upper portion of the passivation layer and having a planar structure, a pixel electrode electrically connected to the drain electrode through the contact hole and including a plurality of pixel branch electrodes, and a second substrate corresponding to the first substrate, where an opening is defined in the common electrode at a position which corresponds to a middle region of the plurality of pixel branch electrodes.