Display Device Row Pixel Group Electrode Touch Sensing
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Solution Overview
Problem
Conventional display devices with touch sensors require additional electrodes, increasing complexity and cost, as they need at least two conductive layers to form a capacitance element for touch detection.
Innovation Solution
A display device with a novel electrode structure where second electrodes are commonly provided for row pixel groups, forming capacitances with third electrodes, allowing touch sensing using a single additional conductive layer, integrated with the light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional electrodes are provided for touch sensor in conventional display devices, then touch detection capability is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the touch sensor electrode structure with the display device electrode structure by making the second electrode serve dual purposes: as a common electrode for the light emitting element and as an electrode for the touch sensor capacitance element. This integration eliminates the need for separate touch sensor electrodes, reducing device complexity while maintaining touch detection capability.
Solution Approach 2:
The second electrode is designed to perform multiple functions simultaneously: it acts as the common electrode for the light emitting element (along with the first electrode) and as one of the electrodes forming the capacitance element for touch sensing (paired with the third electrode). This multi-functionality reduces the total number of electrodes required.
2Reliability
If additional conductive layers are added for touch sensor electrodes, then touch sensor functionality is achieved, but manufacturing process complexity and cost increase
Solution Approach 1:
The patent combines the formation of the second electrode into the existing display device manufacturing process. The second electrode is formed as part of the light emitting element structure using the same conductive layer deposition processes already required for the display device, eliminating the need for separate touch sensor electrode manufacturing steps.
3Ease of manufacture
If a novel electrode structure is used to reduce complexity, then manufacturing is simplified, but touch sensor performance may be compromised
Solution Approach 1:
The patent applies local quality by forming the third electrode with specific properties (such as transparent conductive oxide material) in the regions where touch sensing is required, while the second electrode maintains its properties as a common electrode. This localized optimization ensures that the integrated structure achieves both manufacturing simplicity and touch detection accuracy.
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
Simplifies the production process and reduces costs by incorporating a touch sensor within the display device using existing conductive layers, while maintaining effective touch detection capabilities.
Implementation Method 1
a plurality of third electrodes facing the second electrodes, the third electrodes and the second electrodes forming capacitances
Implementation Method 2
a light emitting layer between the first electrode and the second electrode, the sub pixel including the light emitting layer
Data Source
AI summary
A display device includes a plurality of sub pixels; a plurality of first electrodes, the sub pixel including the first electrode; a plurality of second electrodes, the second electrode being provided commonly for at least one row pixel group, the row pixel group including sub pixels arrayed in a line in a first direction, the plurality of second electrodes being arrayed in a second direction; a light emitting layer between the first electrode and the second electrode, the sub pixel including the light emitting layer; an output transistor connected with the first electrode, the output transistor capable of blocking supply of an electric current to the first electrode, the light emitting layer, and the second electrode; and a plurality of third electrodes facing the second electrodes, the third electrode and the second electrode forming capacitance, the third electrode being connected with a plurality of output terminals respectively.