Curved Branch Electrode Geometry for LCD Transmittance
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Solution Overview
Problem
Conventional LCD display panels experience abnormal liquid crystal (LC) molecule arrangement due to discontinuous electric fields at the sharp angle connections between branch and trunk electrodes, leading to increased curing time and reduced product competitiveness.
Innovation Solution
The display panel design includes a curved side configuration for branch electrodes adjacent to trunk electrodes, with specific geometric relationships between distances A, B, and T, optimizing the LC arrangement and reducing abnormal alignment issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the branch electrode is connected to the trunk electrode at a sharp angle (45° or 135°), then the device complexity is reduced and manufacturing is easier, but the liquid crystal molecules will be arranged abnormally due to discontinuous electric field at the turning portion
Solution Approach 1:
The patent applies curvature by replacing the sharp angle connection between branch and trunk electrodes with a curved connection. Specifically, the turning portion is designed with a curved side that has a first vertex (highest or lowest point along the first direction), creating a smooth transition rather than an abrupt angle. This curved design eliminates the discontinuous electric field at sharp corners, preventing abnormal LC molecule arrangement while maintaining manufacturing feasibility.
2Manufacturing precision
If the curing time of monomers is increased to make LC molecules stably pre-tilt at an angle, then the LC arrangement precision is improved, but the productivity is reduced due to increased process time
Solution Approach 1:
The patent implements preliminary action by pre-configuring the electrode geometry with curved turning portions before the LC filling and curing process. The curved sides with optimized dimensions (where 0.5T ≤ (B-A) ≤ T, with T being the distance between adjacent branch electrodes, A being the shortest distance between curved sides, and B being the distance between vertices) create a continuous electric field distribution that guides LC molecules into proper alignment from the beginning, eliminating the need for extended curing time to correct alignment issues.
3Manufacturing precision
If the turning portion is designed with a curved side instead of sharp angle, then the LC arrangement precision is improved by eliminating discontinuous electric field, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the geometric parameters of the curved turning portion. The curved side is designed with specific dimensional relationships: the first shortest distance A between curved sides, the second shortest distance B between vertices, and the distance T between adjacent branch electrodes must satisfy 0.5T ≤ (B-A) ≤ T. By controlling these parameters, the patent achieves continuous electric field distribution and proper LC alignment without excessive complexity in the electrode design.
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 design improves LC molecule alignment, reduces processing time, and enhances product competitiveness by optimizing the ratio of distances A, B, and T between curved sides and branch electrodes, achieving better transmittance and alignment.
Implementation Method 1
photosensitive monomers are mixed with the liquid crystal during the one drop filling (ODF) process, and then an ultraviolet exposure is executed while an electric field is applied, so that the photosensitive monomers within the liquid crystal are chemically reacted
Implementation Method 2
an ultraviolet exposure is executed while an electric field is applied, so that the photosensitive monomers within the liquid crystal are chemically reacted
Data Source
AI summary
An electrode layer of a display panel includes a first trunk electrode extended along a first direction and a plurality of first and second branch electrodes disposed on two sides of the first trunk electrode. The first branch electrodes are separated by a distance (T). The first branch electrode has a first curved side, and the second branch electrode has a second curved side. The first curved side and second curved side have a first shortest distance (A) therebetween along a second direction. A first vertex is the highest point or lowest point of the first curved side along the first direction, and a second vertex is the highest point or lowest point of the second curved side along the first direction. The first vertex and second vertex have a second shortest distance (B) therebetween along the second direction. The equation of 0.5T≦(B−A)≦T is satisfied.