Touch Display Electrode Layout With Variable-Width Switch Transistors
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Solution Overview
Problem
The complexity of electrode layouts and semiconductor chip structures in display devices with touch detection functions leads to increased size and power consumption, complicating the layout of lines and terminals, which affects the performance and efficiency of both image display and touch detection operations.
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 and line lengths, optimizing the layout to reduce complexity and improve performance, incorporating a touch sensor and switch circuit group to manage touch detection signals efficiently.
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 and image display operation, then the touch detection accuracy and image display quality are improved, but the layout of lines connected to the electrodes becomes complicated, the number of terminals of the semiconductor chip increases, the size of the semiconductor chip becomes larger, and the structure becomes complicated
Solution Approach 1:
The patent divides the drive electrodes into multiple groups (first drive electrode group and second drive electrode group) that can be controlled independently by separate drive circuits. This segmentation allows the touch sensor to manage a large number of electrodes through organized groups, reducing the complexity of line layouts and terminal connections while maintaining high touch detection accuracy through selective activation of electrode groups.
2Measurement precision
If the number of drive electrodes and detection electrodes is increased to improve touch detection performance and image display operation, then the touch detection accuracy and image display quality are improved, but the number of terminals of the semiconductor chip increases and the size of the semiconductor chip becomes larger
Solution Approach 1:
The patent designs the semiconductor chip to integrate multiple functions: it contains both drive circuits for controlling display pixels and touch detection circuits for sensing touch input, along with switch circuits that manage connections between electrodes and external terminals. This multi-functional integration allows the chip to handle a large number of electrodes without proportionally increasing the number of external terminals or chip size, as internal circuitry performs multiple tasks simultaneously.
3Measurement precision
If the number of drive electrodes and detection electrodes is increased to improve touch detection performance and image display operation, then the touch detection accuracy and image display quality are improved, but the structure becomes complicated
Solution Approach 1:
The patent introduces switch circuits as intermediary components between the touch sensor electrodes and the external terminal. These switch circuits act as mediators that selectively connect or disconnect electrode groups from external connections based on operational mode (display vs. touch detection). This intermediary layer simplifies the overall structure by providing a standardized interface point while managing the complexity of connecting numerous electrodes through controlled switching rather than requiring separate external connections for each electrode.
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 design enhances the performance and efficiency of touch detection while maintaining image display quality, reducing power consumption and simplifying the layout, resulting in a more compact and lightweight display device.
Implementation Method 1
The capacitive type utilizes a feature that the electrostatic capacitance between a pair of electrodes (called a drive electrode and a detection electrode) is varied by approach or contact of the inputting object
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.