Touch Sensor Integrated Display Device Electrode Shielding
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Solution Overview
Problem
Existing touch sensor technologies for display devices face challenges such as increased thickness and manufacturing costs due to the need for separate touch panels and additional electrode layers, which affect touch sensitivity and device usability.
Innovation Solution
A touch sensor integrated type display device is designed with touch driving electrodes and sensing electrodes formed as components of the display device, reducing thickness and process complexity, and enhancing touch sensitivity by increasing mutual capacitance between these electrodes, while also incorporating shielding portions to prevent light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an add-on type touch panel is mounted on the display device, then touch sensitivity is improved, but the thickness of the display device increases
Solution Approach 1:
The patent merges the touch sensor electrodes with the display device electrodes by forming touch driving electrodes and touch sensing electrodes on the same substrate as the pixel electrodes and common electrodes. This integration eliminates the need for a separate touch panel, thereby maintaining touch sensitivity while reducing overall device thickness.
2Length of stationary object
If an on-cell type touch sensor is formed on the upper surface of the display device, then thickness is reduced, but manufacturing complexity and cost increase due to additional electrode layers
Solution Approach 1:
The patent implements multi-functionality by designing electrodes that serve dual purposes: pixel electrodes and common electrodes function both as display components and as touch sensing components. This eliminates the need for separate touch sensor electrode layers, reducing manufacturing complexity while maintaining reduced thickness.
3Reliability
If additional electrode layers are added for touch sensing, then touch sensitivity is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines touch sensing functionality with existing display electrode structures. By using pixel electrodes and common electrodes as touch sensing elements, the invention avoids the need for additional touch sensor electrode layers, thereby maintaining touch sensitivity while reducing manufacturing cost and process complexity.
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 reduces the thickness and manufacturing processes required for touch sensor integration, improves touch sensitivity, and prevents light leakage by increasing the number of touch driving and sensing electrodes and using shielding portions to manage electric fields effectively.
Implementation Method 1
improving touch sensitivity by increasing mutual capacitance between touch driving electrodes and touch sensing electrodes
Implementation Method 2
shielding portions that extend from the second electrodes in the spaces formed by the first electrodes arranged with the data lines interposed therebetween
Data Source
AI summary
A touch sensor integrated type display device includes gate lines and data lines that cross over each other, pixel electrodes, first electrodes, second electrodes and shielding portions. The pixel electrodes are formed in areas defined by crossings of the gate lines and the data lines. The first electrodes at least partially overlap the pixel electrodes and are formed in parallel with the data lines. The second electrodes are formed in parallel with the gate lines between the pixel electrodes neighboring each other with the gate lines interposed therebetween. The shielding portions extend from the second electrodes in the spaces formed by the first electrodes arranged with the data lines interposed therebetween.