LCD Touch Common Electrode Slits for Display Uniformity
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Solution Overview
Problem
Incorporating a touch function into liquid crystal display devices while minimizing adverse interactions with the display panel, particularly issues with slits in the common electrode layer affecting image display, especially in low gray-scale modes.
Innovation Solution
The design includes a common electrode layer with slits that overlap with pixel electrodes, strategically positioned to avoid influencing the display effect, and a touch structure with electrodes and signal wires, where slits are placed between touch electrodes and signal wires, reducing interference with data lines and enhancing transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slits are added to the common electrode layer for touch function, then touch sensitivity is improved, but display uniformity deteriorates
Solution Approach 1:
The patent applies local quality by making the common electrode layer have different structures in different regions: in the display area, the common electrode is continuous to ensure display uniformity, while in the touch sensing area, slits are introduced to improve touch sensitivity. This localized structural differentiation resolves the contradiction between touch function and display uniformity.
Solution Approach 2:
The patent segments the common electrode layer by introducing slits that divide it into multiple regions. These slits are strategically positioned to allow better touch signal penetration and sensing while maintaining the overall integrity of the electrode for display purposes. The segmentation enables the structure to serve dual functions of display and touch sensing effectively.
2Adaptability or versatility
If slits are positioned to overlap data lines for touch sensing, then touch function is improved, but image display quality deteriorates
Solution Approach 1:
The patent applies asymmetry by positioning the slits in an asymmetric pattern relative to the data lines and pixel electrodes. The slits are deliberately placed to avoid overlapping with data lines while still achieving effective touch sensing coverage. This asymmetric positioning ensures that touch sensing performance is not compromised while preventing negative effects on image display quality.
Solution Approach 2:
The patent converts the potential harm of slits affecting display quality into a benefit by strategically positioning them to overlap with pixel electrodes rather than data lines. The slits that could potentially disrupt the electric field are instead used to enhance touch sensing by creating favorable capacitance distribution, while the display quality is preserved through careful placement away from critical data line regions.
3Illumination intensity
If slits are placed between touch electrodes and signal wires, then transmittance is improved, but touch electrode isolation is reduced
Solution Approach 1:
The patent introduces an intermediary insulating layer between the touch electrodes and the slits in the common electrode layer. This insulating layer acts as a mediator that maintains electrical isolation between adjacent touch electrodes while allowing the slits to improve light transmittance. The intermediary structure enables both high transmittance and reliable electrode isolation to coexist.
Solution Approach 2:
The patent uses thin insulating film structures to separate touch electrodes while maintaining optical transparency. These thin films provide sufficient electrical isolation between electrodes while having minimal impact on light transmittance. The flexible thin film structure allows the slits to be positioned for optimal transmittance without compromising electrode isolation reliability.
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 improves the display effect by shielding the electric field of data lines, maintaining uniform transmittance and reducing visual impact on the image, especially in low gray-scale modes, while enabling effective touch functionality.
Implementation Method 1
the common electrode and the pixel electrode of a pixel unit forming an in-plane electric field when a voltage is applied thereto
Implementation Method 2
the LCD device controls transmittance of liquid crystals via an electric field to display images
Implementation Method 3
sense an area of the touch panel that is touched by a finger or other means and send information related to the touch event
Data Source
AI summary
A liquid crystal display device includes multiple data lines and multiple scan lines insulatedly intersecting each other. Each of the pixel units includes a common electrode and a pixel electrode insulated from each other by an insulating layer, an in-plane electric field is formed by the common electrode and the pixel electrode The common electrodes are connected together to form a common electrode layer, which comprises multiple touch electrodes and touch signal wires. Each of the touch signal wires is electrically connected with a corresponding touch electrode, first slits are arranged in parallel to the data lines, each of the first slits is disposed between two adjacent touch electrodes or between a touch electrode and an adjacent touch signal wire, except at a junction between the touch signal wire and the touch electrode. A first slit overlaps with a pixel electrode within a pixel unit.