In-Cell LCD Common Electrode Shield and Block Patterns
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Solution Overview
Problem
In-cell type LCD panels with touch sensing functions face limitations in improving the reliability and accuracy of touch sensing due to the high resistance of transparent conductive materials used in common electrodes, which affects capacitance formation and display characteristics.
Innovation Solution
The LCD panel design incorporates a shield pattern and a block pattern with metallic material to reduce the resistance of common electrodes, allowing for improved capacitance formation and touch sensing accuracy, while maintaining the in-cell method's thickness and weight reduction advantages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent conductive material is used in common electrode, then optical loss is reduced, but resistance increases making capacitance formation difficult
Solution Approach 1:
The patent uses a composite structure combining transparent conductive material (ITO) and metallic material (Al) in the common electrode. The ITO layer provides transparency and basic conductivity, while the Al layer provides low resistance and good capacitance formation. This composite approach resolves the contradiction between optical transmission and electrical conductivity by combining materials with complementary properties.
Solution Approach 2:
The patent applies different materials to different regions of the common electrode based on functional requirements. The transparent conductive material is used in regions where optical transmission is critical, while the metallic material is used in regions where low resistance and capacitance formation are prioritized. This local differentiation allows optimization of both optical and electrical properties simultaneously.
2Adaptability or versatility
If separate touch panel is added (add-on method), then touch sensing function is independent from image output, but weight and thickness increase
Solution Approach 1:
The patent merges the touch sensing function with the LCD panel structure by sharing the common electrode and substrate components. The common electrode serves dual purposes: forming electric fields for image display and detecting touch inputs through capacitance changes. This integration eliminates the need for a separate touch panel, reducing weight and thickness while maintaining independent drive capability through separate control circuits.
Solution Approach 2:
The common electrode is designed as a multi-functional component that performs both image output and touch sensing functions. By making the common electrode universal for both purposes, the patent achieves space and material efficiency, reducing the overall device weight and thickness while maintaining the versatility to support both display and touch input functions independently.
3Power
If common electrode covers entire pixel region, then electric field formation is improved, but optical loss increases
Solution Approach 1:
The patent applies different material properties to different regions of the common electrode. In regions where electric field formation is critical, the electrode structure is optimized for capacitance. In regions where light emission occurs, the transparent conductive material is used to minimize optical absorption. This local optimization allows the common electrode to fulfill both electrical and optical requirements effectively.
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 reliability and accuracy of touch sensing functions by lowering the resistance of common electrodes and preventing optical losses, thus improving user input detection without degrading image output quality.
Implementation Method 1
a liquid crystal layer disposed between a pair of substrates bonded to each other and formed of a liquid crystal material to polarize light
Implementation Method 2
the LCD panel generates a predetermined electric field between a common electrode and pixel electrodes corresponding to a plurality of pixel regions
Implementation Method 3
the common electrode includes a transparent conductive material
Implementation Method 4
it is difficult to properly form capacitance for the touch sensing function
Implementation Method 5
The LCD panel design incorporates a shield pattern and a block pattern with metallic material to reduce the resistance of common electrodes
Data Source
AI summary
A liquid crystal display (LCD) panel may include: a plurality of unit pixels arranged in a matrix shape in a display region, and each including two or more sub pixels corresponding to different colors and arranged in parallel to each other; a gate line of a first direction and a data line of a second direction which intersect each other; a shield pattern disposed on a first interlayer dielectric layer covering the gate line and the data line, and overlapping the data line; a plurality of first common electrode patterns and second common electrode patterns arranged on a second interlayer dielectric layer covering the shield pattern; and a block pattern corresponding to each of the first and second common electrode patterns, disposed in a boundary region between two or more sub pixels included in each of the unit pixels, and overlapping at least one of the gate line and the data line.