Electrooptic Device Pixel Electrode Recess Protrusion Transverse Field
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Solution Overview
Problem
Liquid crystal devices face issues with defective orientation and light leakage due to transverse electric fields, leading to afterimages, tailing, and decreased contrast during the display of moving images, which existing technologies have not adequately addressed.
Innovation Solution
The design incorporates pixel electrodes with recesses and protrusions on adjacent edges to reduce transverse electric fields by creating a non-uniform electric field intensity distribution, and the use of a conducting layer with a different potential to further mitigate these effects, while maintaining the open air ratio and preventing contrast decrease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pixel electrodes are disposed adjacent to each other with different potentials, then the display function is achieved, but a transverse electric field is generated causing defective orientation and light leakage
Solution Approach 1:
A non-conductive layer is introduced between adjacent pixel electrodes to act as an intermediary that blocks the generation and propagation of transverse electric fields. This layer prevents the harmful electric field from forming while allowing the pixel electrodes to maintain their different potentials for normal display operation.
Solution Approach 2:
The harmful transverse electric field component is extracted or removed from the system by introducing the non-conductive layer, which selectively blocks the lateral electric field while allowing the vertical electric field necessary for display function to remain intact.
2Reliability
If the transverse electric field is reduced by modifying pixel electrode shapes, then afterimages and tailing are reduced, but the open air ratio may decrease affecting contrast
Solution Approach 1:
The non-conductive layer serves as a mediator that reduces transverse electric field effects without requiring modification of the pixel electrode shapes, thereby maintaining the open air ratio while still reducing afterimages and tailing.
Solution Approach 2:
The non-conductive layer is selectively positioned between adjacent pixel electrodes where the transverse electric field is generated, providing local suppression of the harmful field without affecting the overall pixel structure or open air ratio.
3Object-affected harmful factors
If the interval between pixel electrodes is increased to reduce transverse electric field, then defective orientation is reduced, but the display area decreases
Solution Approach 1:
The non-conductive layer acts as a thin intermediary barrier that blocks transverse electric field generation without requiring a large increase in the interval between pixel electrodes, thus maintaining display area while reducing defective orientation.
Solution Approach 2:
Instead of increasing the horizontal interval between pixel electrodes, the solution moves to another dimension by introducing a non-conductive layer in the vertical stacking direction, effectively blocking the transverse electric field without sacrificing display area.
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 approach effectively reduces afterimages and tailing while maintaining image contrast, enhancing the display quality of moving images by minimizing transverse electric field impacts.
Implementation Method 1
a transverse electric field (an electric field parallel to the substrate surface or an oblique electric field containing a component parallel to the substrate surface) which is generated between adjacent pixel electrodes
Implementation Method 2
the use of a conducting layer with a different potential to further mitigate these effects
Data Source
AI summary
An electrooptic device includes two adjacent pixel electrodes. A potential that is different from the potential of the first and second pixel electrodes is applied to an area between the adjacent pixel electrodes.