Integrated Touch Electrodes in Display Devices for Stable Driving
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Solution Overview
Problem
Existing display devices with integrated touch screen panels require separate components and structures, leading to increased thickness, manufacturing costs, and reduced image visibility, as well as inefficient time utilization and stability in touch screen driving.
Innovation Solution
The display device integrates pixel electrodes used for image display as touch electrodes, allowing concurrent operation of the touch screen panel during image display, with touch driving signals supplied to specific electrodes while other electrodes function as pixel electrodes, enabling efficient time utilization and stable driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate touch screen panel components are used, then touch functionality is achieved, but device structure becomes complex and thickness increases
Solution Approach 1:
The patent combines the touch screen panel with the display device by integrating touch electrodes with pixel electrodes. The second pixel electrode is patterned to serve dual functions as both a display electrode and a touch electrode (first touch electrode), eliminating the need for separate touch screen components and reducing overall device complexity
Solution Approach 2:
The second pixel electrode is designed to perform multiple functions: it serves as an electrode for image display during emission periods and as a touch electrode during non-emission periods. This multi-functionality reduces the number of separate components needed while maintaining both display and touch capabilities
2Reliability
If separate touch screen panel components are used, then touch functionality is achieved, but manufacturing cost increases
Solution Approach 1:
The touch screen panel is manufactured as an integrated structure with the display device using the same substrate and electrode layers. The first and second touch electrodes are formed using the same patterning processes as the pixel electrodes, eliminating the need for separate manufacturing steps and reducing overall manufacturing cost
Solution Approach 2:
The second pixel electrode serves dual purposes as both display and touch functionality, meaning a single manufacturing process produces components that perform both functions. This eliminates the need for separate touch electrode manufacturing steps, reducing material costs and manufacturing complexity
3Reliability
If separate touch screen panel components are used, then touch functionality is achieved, but image visibility is reduced
Solution Approach 1:
The touch electrodes are integrated within the display structure rather than being placed as separate layers on top. The first touch electrode is formed by patterning the second pixel electrode, which is already part of the light-emitting structure, ensuring that touch functionality is achieved without adding layers that would block or reduce image visibility
4Reliability
If touch screen panel is driven separately, then touch inputs are detected, but time utilization efficiency decreases
Solution Approach 1:
The touch screen panel is driven concurrently with the display device during the entire frame period. Touch driving signals are supplied to the first touch electrode continuously, and touch inputs are detected throughout both emission and non-emission periods, maximizing the utilization of available time rather than dedicating separate time slots for touch operations
5Reliability
If touch driving signals are supplied to all electrodes simultaneously, then touch detection is enabled, but electrode function stability decreases
Solution Approach 1:
The function of the second pixel electrode dynamically changes based on the operating period. During emission periods, it functions as a pixel electrode receiving second pixel power source voltage. During non-emission periods, it functions as a first touch electrode receiving touch driving signals. This dynamic switching maintains functional stability within each period while enabling both display and touch operations
Solution Approach 2:
The electrode functions are switched periodically between emission and non-emission periods. The second pixel electrode alternates between serving as a display electrode during emission periods and as a touch electrode during non-emission periods. This periodic switching ensures that each electrode maintains a stable, defined function during each period, preventing signal interference while enabling both operations
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 integration simplifies the device structure, improves time efficiency, and ensures stable touch screen operation by sensing touch inputs through capacitance changes, enhancing both image display and touch functionality.
Implementation Method 1
sensing touch inputs through capacitance changes
Data Source
AI summary
A display device integrated with a touch screen panel includes a display unit in which scan lines and data lines crossing each other, and pixels are arranged, wherein the pixels are positioned at crossing regions of the scan lines and the data lines and each of the pixels comprises first and second pixel electrodes, first touch electrodes extending along a first direction on the display unit, and second touch electrodes extending along a second direction on the display unit, and arranged to overlap the first touch electrodes, the second touch electrodes being spaced apart from the first touch electrodes, wherein the first touch electrodes are implemented by patterning the second pixel electrode in the first direction, and wherein while a touch driving signal is supplied to one or more first touch electrodes among the first touch electrodes, a second pixel power source is supplied to remaining first touch electrodes.