Touch Screen Electrode Layer Separation for Display Quality
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Solution Overview
Problem
The integration of a touch screen into LCD devices increases manufacturing complexity and cost due to the need for multiple masks and processes, leading to reduced productivity, price competitiveness, and degraded display quality from load and capacitance differences between touch driving and sensing electrodes.
Innovation Solution
The touch driving and sensing electrodes are disposed on different layers within the liquid crystal panel, reducing the number of masks required and integrating the data driver IC and touch IC to share components, allowing for efficient touch sensing without compromising display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch driving electrodes and touch sensing electrodes are disposed on the same layer, then the manufacturing process is simpler, but the number of masks increases and manufacturing cost increases
Solution Approach 1:
The patent applies layer separation by disposing touch driving electrodes on one layer and touch sensing electrodes on another layer within the liquid crystal panel. This dimensional separation in the Z-axis direction reduces the number of masks required in the manufacturing process while maintaining the functionality of both electrode types.
2Productivity
If touch driving electrodes and touch sensing electrodes are disposed on the same layer, then manufacturing processes are reduced, but load and capacitance differences cause block dim and degrade display quality
Solution Approach 1:
By separating touch driving electrodes and touch sensing electrodes into different layers, the patent eliminates the load and capacitance differences that occur when both electrode types share the same layer. This layer separation prevents block dim and maintains display quality while still enabling integrated manufacturing.
3Manufacturing precision
If multiple masks and manufacturing processes are used for touch electrodes, then electrode separation is achieved, but manufacturing cost increases and price competitiveness decreases
Solution Approach 1:
The patent achieves electrode separation by utilizing different layers within the liquid crystal panel structure rather than requiring multiple masks and complex manufacturing processes. This approach maintains precise electrode separation while simplifying the manufacturing process and reducing costs.
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 solution reduces manufacturing costs, enhances touch sensing performance, and prevents block dim issues by separating touch electrodes on different layers, maintaining display quality and improving productivity.
Implementation Method 1
the touch sensing electrode 20 (RX) senses a capacitive change
Data Source
AI summary
Discussed are a display device integrated with a touch screen and a method of driving the same, which can save the manufacturing cost and prevent the degradation of display quality caused by touch driving.