Touch Sensor Integrated Display Device Electric Field Shielding
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Solution Overview
Problem
Touch sensor integrated type display devices face issues with erroneous touch operations due to changes in the dielectric constant of liquid crystal affecting the electric field between touch driving and sensing electrodes, leading to false recognition of touch inputs.
Innovation Solution
The implementation of a touch sensor integrated type display device with a configuration of first and second electrodes, including bottleneck connections and resistance reducing wires, where electric field shielding portions are introduced between unit pixel electrodes and touch sensing electrodes to prevent changes in the dielectric constant from affecting the electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If display common electrodes serve as touch sensing electrodes to reduce component count, then device complexity is reduced, but measurement precision deteriorates due to false touch recognition from liquid crystal dielectric constant changes
Solution Approach 1:
A capacitance compensation electrode is introduced as an intermediary element between the touch driving electrode and the touch sensing electrode. This intermediate electrode generates a compensating electric field that counteracts the spurious capacitance changes caused by liquid crystal dielectric constant variations, thereby enabling accurate touch recognition while maintaining the integrated electrode structure
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the voltage applied to the capacitance compensation electrode based on detected capacitance variations. When liquid crystal dielectric constant changes occur during display operation, the system detects the resulting capacitance shift and adjusts the compensation electrode voltage to maintain stable touch sensing capacitance, thereby preventing false touch recognition
2Ease of operation
If add-on type touch sensor is used to enable touch functionality, then ease of operation is improved, but device thickness increases reducing visibility
Solution Approach 1:
The patent merges the touch sensor functionality with the display electrode structure by using the same glass substrate and integrating the touch sensing electrodes into the display panel architecture. This consolidation eliminates the need for separate add-on touch sensor modules, thereby maintaining thin display device thickness while preserving touch input capability
Solution Approach 2:
The display electrodes are designed to serve dual functions: as common electrodes for display operation and as touch sensing electrodes for touch input detection. This multi-functionality allows the display device to provide both visual output and touch interaction without requiring additional dedicated components, thus maintaining a thin overall structure
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 effectively prevents erroneous touch operations by shielding the electric field and maintaining a stable capacitance, ensuring accurate touch recognition without false inputs.
Implementation Method 1
each first electrode pattern includes an electric field shielding portion disposed between the unit pixel electrode and the second electrode
Implementation Method 2
a capacitance between a touch driving electrode and the touch sensing electrode is changed
Implementation Method 3
changes in the dielectric constant depending on the change in the alignment state of the liquid crystal
Data Source
AI summary
A touch sensor integrated type display device includes a plurality of first electrodes each including a plurality of first electrode patterns, which are adjacent to one another in a first direction and are connected to one another through at least one first bottleneck, and a plurality of second electrodes arranged in a second direction crossing the first direction. The first electrodes are arranged in the first direction. The plurality of first electrode patterns and the plurality of second electrodes are alternately disposed along the first direction. At least one unit pixel electrode is disposed correspondingly to each first electrode pattern. Each first electrode pattern includes an electric field shielding portion disposed between the unit pixel electrode and the second electrode.