Capacitive Touch Display Auxiliary Wiring Layout
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Solution Overview
Problem
Existing display devices with touch detection functions face challenges in maintaining a high aperture ratio and accurate touch detection due to the influence of connection resistance and auxiliary wiring, particularly in capacitive-type touch panels used in mobile terminals.
Innovation Solution
A display device with a touch detection function is designed, featuring a matrix arrangement of pixels with sub-pixels of different colors, where auxiliary wiring with lower electrical resistance is strategically placed to reduce connection resistance and improve touch detection accuracy, while maintaining image display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If auxiliary wiring of metal material is added to reduce connection resistance, then touch detection accuracy is improved, but aperture ratio becomes smaller
Solution Approach 1:
The patent introduces a new spatial dimension by arranging sub-pixels in multiple columns (first column, second column, etc.) along the row direction. This multi-column configuration allows auxiliary wiring to be positioned in gaps between columns rather than within individual sub-pixel areas, effectively utilizing previously unused spatial dimensions to reduce connection resistance without compromising aperture ratio.
Solution Approach 2:
The patent segments the pixel array into multiple columns with sub-pixels arranged in a specific pattern (e.g., first column has sub-pixels of first color, second column has sub-pixels of second color). This segmentation creates natural gaps and pathways between columns where auxiliary wiring can be routed, separating the function of light emission from the function of electrical connection.
2Reliability
If sub-pixels are arrayed in multiple columns to accommodate auxiliary wiring, then connection resistance is reduced, but device structure becomes more complex
Solution Approach 1:
The patent makes the pixel array structure multi-functional by designing it to simultaneously achieve color display, touch detection, and low-resistance electrical connection. The multi-column sub-pixel arrangement serves both the original purpose of color rendering and the additional purpose of providing pathways for auxiliary wiring, eliminating the need for separate structural elements.
Solution Approach 2:
The patent merges the functions of color display and electrical connection into a unified pixel array structure. The auxiliary wiring is integrated into the pixel array design itself rather than being added as a separate component, combining what were previously separate functional requirements into a single cohesive structure.
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 touch detection accuracy and increases the display area by reducing the influence of time constants on drive signals, thereby improving the overall performance of capacitive-type touch panels.
Implementation Method 1
a touch detection electrode that faces the drive electrodes and forms a capacitance with the drive electrodes; and a touch detection unit that detects a position of a proximity object based on a detection signal sent from the touch detection electrode
Data Source
AI summary
A display device is provided. The display device includes a first sub-pixel and a second sub-pixel that are arranged adjacent to each other in a first direction and that represent a first color; a third sub-pixel and a fourth sub-pixel that are arranged adjacent to each other in the first direction and that represent a second color; a first drive electrode that overlaps the first sub-pixel and the second sub-pixel, and that extends in the first direction; and a second drive electrode that overlaps the third sub-pixel and the fourth sub-pixel, and that extends in the first direction, wherein, the first and second sub-pixels and the third and fourth sub-pixels are arranged adjacent to each other in a second direction different from the first direction, the first drive electrode and the second drive electrode are separated from each other with a slit interposed therebetween, and the slit extends in the first direction.