Touch Panel Display Controller Consolidation
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Solution Overview
Problem
The existing touch-panel-equipped display devices require separate controllers for image display and touch position detection, leading to increased costs due to the need for controllers on both the active matrix and counter substrates.
Innovation Solution
A touch-panel-equipped display device configuration where the signal lines, counter electrodes, and control unit for touch position detection are provided on the active matrix substrate, allowing for a single controller to manage both image display and touch position detection, with signal lines formed between insulating films to minimize interference with the liquid crystal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate controllers for image display and touch position detection are provided on different substrates, then the touch position detection function is achieved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the touch position detection controller and image display controller into a single integrated controller on the active matrix substrate. The counter electrodes serve dual purposes: as touch detection elements and as signal transmission pathways. This consolidation eliminates the need for separate controllers on different substrates, reducing device complexity while maintaining both touch detection and display functions.
Solution Approach 2:
The counter electrodes are designed to perform multiple functions simultaneously: they act as touch detection electrodes for capacitance-based touch sensing, and as signal transmission lines for driving the liquid crystal display. This multi-functionality allows a single controller to manage both touch position detection and image display, eliminating the need for separate dedicated controllers.
2Object-affected harmful factors
If signal lines are formed on the active matrix substrate between insulating films, then interference with the liquid crystal layer is minimized, but the manufacturing process complexity increases
Solution Approach 1:
The signal lines are positioned in a specific dimensional space between the first and second insulating films, rather than on the surface or within the liquid crystal layer. This vertical positioning in the layered structure allows electrical signals to be transmitted close to the liquid crystal layer without direct contact, minimizing electromagnetic interference and display noise while maintaining manufacturability through standard thin-film deposition techniques.
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 configuration reduces costs by consolidating control functions on the active matrix substrate while minimizing display noise and improving adhesion and resistance in the signal line connections.
Implementation Method 1
the counter electrodes and the pixel electrodes having electrostatic capacitances therebetween
Data Source
AI summary
A touch-panel-equipped display device includes an active matrix substrate 1, TFTs 4; a first insulating film 44 formed on a liquid crystal layer side with respect to the TFT 4; pixel electrodes 31 provided on a liquid crystal layer side with respect to the first insulating film; a second insulating film 46 provided on a liquid crystal layer side with respect to the pixel electrodes; counter electrodes 21 that are formed on a liquid crystal layer side with respect to the second insulating film, the counter electrodes and the pixel electrodes having electrostatic capacitances therebetween; a control unit that detects a touch position by supplying a touch driving signal to the counter electrodes; and signal lines 22 for supplying the touch driving signal from the control unit to the counter electrodes. The signal lines are formed between the first insulating film and the second insulating film.