Liquid Crystal Display Panel Electrodes to Reduce Dark-State Light Leakage
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Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from light leakage during dark states due to birefringence effects in the liquid crystal layer, which reduces contrast and display performance.
Innovation Solution
The LCD panel incorporates a first electrode layer adjacent to the LC layer for sub-pixel areas and a third electrode layer with vias, allowing LC molecules to deflect under voltage bias for multi-domain segmentation, which is filtered by orthogonal polarizers to reduce light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light enters the LC layer at an angle rather than perpendicular, then the display can accommodate wider viewing angles, but the light experiences birefringence effect and becomes elliptically polarized, causing light leakage in dark state
Solution Approach 1:
The invention divides the liquid crystal layer into multiple domains by introducing a third electrode layer with vias that creates different orientation regions. This segmentation allows light entering at various angles to be handled by different domains, reducing the birefringence effect and preventing elliptical polarization that causes light leakage, while maintaining wide viewing angles
Solution Approach 2:
The third electrode layer with vias acts as an intermediary element that modifies the electric field distribution within the LC layer. This intermediary structure creates multiple orientation domains that mediate between the incoming light at different angles and the orthogonal polarizers, preventing light leakage while maintaining viewing angle performance
2Device complexity
If the LCD panel uses conventional single-electrode configuration, then the device complexity is low, but light leakage occurs in dark state due to inability to create multi-domain effect
Solution Approach 1:
The invention segments the electrode structure into three independent layers: first electrode layer for sub-pixel areas, second electrode layer for sub-pixel areas, and third electrode layer with vias for shielding areas. This segmentation enables creation of multiple orientation domains within the LC layer, effectively preventing light leakage in dark state while maintaining reasonable device complexity
Solution Approach 2:
The invention transitions from a conventional single-plane electrode configuration to a multi-layer three-dimensional electrode structure. By stacking three electrode layers at different positions and configurations, the patent creates complex electric field patterns that generate multiple orientation domains, solving the light leakage problem without excessive complexity increase
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 effectively minimizes light leakage in dark states by deflecting LC molecules to create multiple domains, enhancing display contrast and performance.
Implementation Method 1
Because of the birefringence property of the LC molecules, this part of light incident to the LC layer 1013 with an angle will experience birefringence effect and become elliptically polarized light
Implementation Method 2
When the LCD panel is in the dark state, the LC molecules between the first and third electrode layers are polarized under the effect of the voltage bias (driving voltage) to achieve the multi-domain division effect
Implementation Method 3
the third electrode layer corresponding to the shielding areas; wherein, the third electrode disposed with vias. When the LCD panel is in the dark state, the LC molecules between the first and third electrode layers are polarized under the effect of the voltage bias (driving voltage) to achieve the multi-domain division effect, and is filtered out by the orthogonal polarizers of the upper and the lower substrates
Data Source
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AI summary
A liquid crystal display panel (50) and a liquid crystal display (500). The liquid crystal display panel (50) comprises a first substrate (21) and a second substrate (22) arranged opposite to each other, as well as a liquid crystal layer (23) located between first substrate (21) and a second substrates (22). The display region of the liquid crystal display panel (50) is provided with a plurality of sub-pixel regions (201) arranged in a matrix and a light shielding region (202) located between two adjacent sub-pixel regions (201). The side of the first substrate (21) adjacent to the liquid crystal layer (23) is provided with first electrode layer (211). The first electrode layer (211) corresponds to the sub-pixel regions (201) and the light shielding region (202). The side of the second substrate (22) adjacent to the liquid crystal layer (23) is provided with a second electrode layer (222) and a third electrode layer (223) independent of each other. The second electrode layer (222) corresponds to the sub-pixel regions (201), and the third electrode layer (223) corresponds to the light-shielding region (202). The third electrode layer (223) is provided with a through hole. The problem in the liquid crystal display panel (50) of light leakage in a dark state can be improved.