Touch Display Electrode Layout Using Variable-Width Switch Transistors
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Solution Overview
Problem
The increasing number of drive and detection electrodes in display devices with touch detection functions complicates the layout of lines and terminals, leading to larger semiconductor chips and more complex structures.
Innovation Solution
A display device design that includes a display unit with electrodes, a touch sensor, and a switch circuit group featuring transistors with varying channel widths connected via lines of different lengths, optimizing the layout and reducing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of drive electrodes and detection electrodes is increased to improve touch detection performance, then the touch detection capability is improved, but the layout of lines and terminals becomes complicated and the semiconductor chip size increases
Solution Approach 1:
The patent combines the drive electrode and detection electrode into a single electrode structure. The same electrode serves dual purposes: driving the liquid crystal display and detecting touch input. This merging eliminates the need for separate drive and detection electrode lines, significantly reducing layout complexity while maintaining touch detection functionality.
Solution Approach 2:
The electrode is designed to perform multiple functions simultaneously. It acts as both a drive electrode for displaying images and a detection electrode for sensing touch operations. This multi-functionality reduces the total number of electrodes and connections needed, simplifying the overall device structure.
2Measurement precision
If the number of drive electrodes and detection electrodes is increased to improve touch detection performance, then the touch detection capability is improved, but the semiconductor chip size becomes larger
Solution Approach 1:
By merging the drive and detection electrodes into one, the patent reduces the number of separate electrode structures and their associated connection lines. This consolidation directly reduces the area required on the semiconductor chip, allowing for smaller chip size while maintaining adequate touch detection performance.
3Measurement precision
If the number of drive electrodes and detection electrodes is increased to improve touch detection performance, then the touch detection capability is improved, but the structure becomes more complicated
Solution Approach 1:
The patent merges multiple electrode functions into a single electrode structure, eliminating the need for separate drive and detection electrode systems. This significantly simplifies the overall device structure, reducing the number of components and their interconnections while preserving touch detection capability.
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 design simplifies the layout of electrodes and terminals, reducing the size of semiconductor chips and minimizing structural complexity while maintaining effective image display and touch detection performance.
Implementation Method 1
a first transistor connected to a first electrode via a line of a first length and a second transistor connected to a second electrode via a line of a second length longer than the first length. The channel width of the first transistor is smaller than a channel width of the second transistor.
Data Source
AI summary
A display device is provided and includes display unit comprising common electrodes two dimensionally arrayed on substrate, drive signal lines configured to transmit drive signals for touch detection to common electrodes, and switch circuit comprising transistors connected to drive signal lines to select at least one common electrode; flexible substrate connected to substrate; pads at connections of flexible substrate and substrate; and touch detection circuit configured to transmit drive signals to common electrodes, wherein: transistors comprises: first transistor connected to first electrode of common electrodes via first wiring of first length; and second transistor connected to second electrode of common electrodes via second wiring of second length; channel width of first transistor is narrower than channel width of second transistor; drive signal lines are respectively connected to pads separated at two or more positions.