LCD Touch Electrode Positioning for Sensitivity
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) with touch screen panels require additional processing and adhesive layers, increasing thickness and costs, and separate input devices like keyboards or mice are needed for user input.
Innovation Solution
An integrated touch screen panel is implemented in the LCD, where conductive patterns on the LCD serve as driving electrodes, formed on the polarizing plates or windows near the contact points, enhancing touch sensitivity by maximizing the distance between driving and sensing electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch screen panel is attached to the outer surface of a flat panel display, then touch functionality is added, but the entire thickness of the display is increased
Solution Approach 1:
The patent merges the touch screen panel with the flat panel display by integrating the touch sensor electrodes directly into the display structure. The touch sensor electrodes are formed on the same substrate as the display electrodes, eliminating the need for a separate attached touch panel layer, thus adding touch functionality without increasing overall display thickness.
Solution Approach 2:
The patent implements multi-functionality by using the same conductive structures for both display driving and touch sensing purposes. The electrodes serve dual roles: as driving electrodes for the liquid crystal display and as sensing electrodes for the touch screen, allowing one component to perform multiple functions without requiring additional separate layers.
2Adaptability or versatility
If a touch screen panel is attached to the outer surface of a flat panel display, then touch functionality is added, but processing time and cost are increased
Solution Approach 1:
The patent combines the touch screen panel fabrication with the flat panel display manufacturing process. Both the display electrodes and touch sensor electrodes are formed simultaneously using the same deposition and patterning processes, eliminating the need for separate attachment steps and reducing overall processing time.
Solution Approach 2:
The patent uses universal manufacturing processes that serve both display and touch panel fabrication. The same transparent conductive oxide deposition, photolithography, and patterning techniques are used for both the display electrodes and touch sensor electrodes, reducing the number of separate processing steps required.
3Ease of manufacture
If driving electrodes are positioned farther from contact points, then manufacturing is simplified, but touch sensitivity is reduced
Solution Approach 1:
The patent optimizes electrode positioning by utilizing the three-dimensional space within the display structure. The touch sensor electrodes are positioned in the same plane as the display electrodes rather than being stacked vertically, allowing maximum proximity to contact points while maintaining manufacturing simplicity through planar fabrication processes.
Solution Approach 2:
The patent applies different electrode configurations in different regions of the display. The touch sensor electrodes are positioned close to the outer surface where contact occurs to maximize sensitivity, while the display electrodes maintain their standard configuration for optimal display performance, allowing localized optimization without compromising overall manufacturing simplicity.
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 reduces processing time and cost, while improving touch sensitivity by increasing the change in capacitance between electrodes, allowing precise touch recognition without the need for separate input devices.
Implementation Method 1
the capacitive touch screen panel converts a contact position into an electrical signal by sensing a change in capacitance formed between a conductive sensing pattern and an adjacent sensing pattern, ground electrode or the like when a user's hand or object is in contact with the touch screen panel
Data Source
AI summary
A liquid crystal display with an integrated touch screen panel is disclosed. According to some aspects, conductive patterns or conducting patterns provided to the LCD are used as driving electrodes of the touch screen panel. A driving electrode of the touch screen panel may be formed on one surface of a polarizing plate or window attached to the LCD so as to be positioned close to a contact point, thereby improving touch sensitivity.