Liquid Crystal Display Electrode Climb Over Common Line
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Solution Overview
Problem
In liquid crystal display devices, particularly those using the FFS system, there is a challenge in maintaining the continuity and uniformity of the second electrode to prevent discontinuity and burn-in, which affects display quality and transmittance due to the formation of slits and the geometry of the common line and electrodes.
Innovation Solution
The second electrode is designed to extend immediately above the common line, with a non-linear first edge and a linear second edge, and is formed to climb over the step of the common line, ensuring continuity and reducing the occurrence of discontinuity, while the slits are strategically placed to enhance transmittance and viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If slits are provided on the upper-layer electrode to enhance transmittance and viewing angle, then display quality is improved, but the electrode may become discontinuous causing burn-in
Solution Approach 1:
The patent extends the second electrode in the vertical dimension to climb over the common line structure. By making the electrode extend from the first substrate side over the common line to the second substrate side, it creates a three-dimensional path that bypasses the discontinuity issue caused by slits in the planar dimension, thus maintaining both transmittance and electrode continuity
Solution Approach 2:
The second electrode is designed to extend immediately above the common line before the slits are formed. This preliminary extension ensures that the electrode maintains continuity over the common line area, preventing burn-in before the slit pattern is even applied to enhance transmittance
2Area of stationary object
If the common line is positioned close to gate lines for compact design, then device area is reduced, but electrode discontinuity and burn-in risk increase
Solution Approach 1:
Instead of increasing the horizontal distance between the common line and gate lines (which would increase device area), the patent uses the vertical dimension by extending the second electrode to climb over the common line. This allows the common line to remain in its compact position while still preventing electrode discontinuity and burn-in
Solution Approach 2:
The second electrode has asymmetric edges: a first edge that extends immediately above the common line and a second edge that forms a slit pattern. This asymmetric design allows the electrode to maintain continuity over the common line while still providing the slit functionality for enhanced transmittance and viewing angle
3Reliability
If the second electrode is extended to climb over the common line step, then electrode continuity is maintained, but manufacturing complexity increases
Solution Approach 1:
The patent merges the common line function with the electrode structure by having the second electrode extend over the common line. This integration means the electrode serves dual purposes: maintaining continuity over the common line and providing the slit pattern for optical performance, thereby reducing the need for separate structural elements and simplifying manufacturing
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 configuration suppresses the occurrence of non-uniform display and burn-in, allows for a high transmittance, and maintains a wide viewing angle, achieving good display quality by preventing discontinuity of the second electrode.
Implementation Method 1
The alignment of liquid crystal molecules is controlled by controlling an electric field which is produced between the two kinds of transparent electrodes
Implementation Method 2
The alignment of liquid crystal molecules is controlled by controlling an electric field
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes a first gate line, a second gate line, a common line, a first electrode, an insulation film, and a second electrode. The common line includes a first edge, which has a non-linear shape and is formed at a first distance from the first gate line, and a second edge, which is formed at a second distance, which is shorter than the first distance, from the second gate line. The first electrode is disposed between the first gate line and the second gate line and put in contact with the common line. The insulation film is disposed above the first electrode. The second electrode is disposed above the insulation film, opposed to the first electrode, extending immediately above the first edge of the common line, and having a slit formed therein.