Integrated Touch LCD Common Electrode Width Variation
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Solution Overview
Problem
Conventional liquid crystal display devices with built-in touch panels face issues of thickness and misalignment due to separate manufacturing and stacking of touch and display panels.
Innovation Solution
A liquid crystal display device with a built-in touch panel is designed, where the touch panel is integrated into the display device by using a common electrode with divided electrode portions and common lines of varying widths, reducing resistance differences and eliminating the need for misalignment countermeasures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the touch panel and display panel are manufactured separately and stacked together, then the touch panel can be assembled onto the display panel, but the overall device thickness increases and misalignment countermeasures are required
Solution Approach 1:
The patent merges the touch panel and display panel into a single integrated structure where the touch sensor electrodes are formed on the same substrate as the display electrodes. This integration eliminates the need for separate manufacturing and stacking processes, thereby reducing device thickness while maintaining ease of manufacture through a unified fabrication process
Solution Approach 2:
The patent implements multi-functionality by using a common substrate and shared electrode structures that serve both display and touch sensing functions. The same substrate supports both the liquid crystal display electrodes and the touch sensor electrodes, allowing one component to fulfill multiple functions and eliminate the need for separate stacked panels
2Ease of manufacture
If the touch panel and display panel are manufactured separately and stacked together, then the touch panel can be assembled onto the display panel, but misalignment countermeasures are required
Solution Approach 1:
By merging the touch panel and display panel into a single integrated structure with electrodes formed on the same substrate, the patent eliminates the stacking process entirely. This integration removes the source of misalignment problems while maintaining ease of manufacture through a unified fabrication process that inherently ensures precise alignment
Solution Approach 2:
The patent segments the electrode functions into distinct electrode patterns (display electrodes and touch sensor electrodes) that are formed separately on the same substrate. This segmentation allows each electrode type to be optimized for its specific function while maintaining precise spatial relationships through the shared substrate fabrication process, eliminating misalignment issues
3Ease of manufacture
If common lines of uniform width are used, then the manufacturing process is simple, but resistance values differ significantly due to varying line lengths
Solution Approach 1:
The patent applies local quality by varying the width of common lines based on their specific location and length requirements. Longer common lines are made wider to compensate for their increased resistance, while shorter lines maintain standard width. This localized adjustment ensures uniform resistance values across all common lines, improving electrical performance uniformity while maintaining ease of manufacture through a systematic design approach
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 integration of the touch panel into the liquid crystal display device thins the overall structure and eliminates the need for misalignment countermeasures, while the varying widths of common lines reduce resistance differences, enhancing performance.
Implementation Method 1
the liquid crystal material is driven by an electric field formed between the pixel electrodes and the common electrode
Implementation Method 2
A liquid crystal display device with a built-in touch panel includes a liquid crystal material
Implementation Method 3
the presence or absence of touch is detected according to a difference of a capacitance caused by the presence or absence of a material that blocks the electric field formed between the detection electrode and the common electrode
Data Source
AI summary
The presence or absence of touch is detected according to a difference of a capacitance caused by the presence or absence of a material that blocks the electric field formed between the detection electrode and the common electrode. The common electrode includes a plurality of divided electrode portions that is extended in a lateral direction and aligned with each other in a longitudinal direction. Each of the plurality of common lines is electrically connected to at least one of the divided electrode portions. The plurality of common lines is arranged in an area next to the common electrode in the lateral direction of the common electrode, arranged next to each other in a width direction orthogonal to a length thereof, is different in width from each other, and the width of the common lines is wider as the length is longer.