Transparent Display Input Sensor Structure for Sensitivity and Transmittance
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Solution Overview
Problem
Existing transparent display devices face challenges in balancing transmittance and input sensing sensitivity due to the presence of conductors in the input sensor, which affect emission efficiency.
Innovation Solution
A display device design featuring a display panel with a transmission area and an input sensor comprising conductive patterns, including first and second sensing electrodes with mesh lines, a transparent electrode, and a cover insulating layer, which enhances input sensing sensitivity while maintaining high transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conductors are added to the input sensor to detect external input, then sensing sensitivity is improved, but transmittance of the display area deteriorates
Solution Approach 1:
The sensing electrode is divided into multiple segments (first sensing electrode and second sensing electrode) with different transparency levels. The first sensing electrode has higher transparency than the second sensing electrode, allowing light to pass through more effectively while still maintaining sensing capability. This segmentation resolves the contradiction by distributing the sensing function across multiple transparent components rather than using a single opaque conductor.
Solution Approach 2:
Different regions of the sensing electrode have different transparency properties. The first sensing electrode is designed with higher transparency for areas requiring better light transmission, while the second sensing electrode has lower transparency for areas prioritizing sensing sensitivity. This local differentiation allows the system to optimize both transmittance and sensing sensitivity in different locations simultaneously.
2Illumination intensity
If transparent electrode is added to improve transmittance, then transmittance is improved, but device complexity increases
Solution Approach 1:
The transparent electrode serves multiple functions simultaneously: it acts as a conductor for the sensing function, provides structural support for the sensor layers, and enhances light transmission. By making this single component multi-functional, the patent avoids adding separate dedicated transparent conductive layers, thereby improving transmittance without proportionally increasing device complexity.
Solution Approach 2:
The transparent electrode combines the functions of electrical conduction and optical transparency into a single integrated component. Rather than adding a separate transparent conductive oxide layer on top of the existing sensing structure, the transparency function is merged into the sensing electrode itself, reducing overall device complexity while achieving high transmittance.
Data Source
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AI summary
A display device includes: a display panel including a display area including a transmission area, and a non-display area adjacent to the display area; and an input sensor on the display panel and including a plurality of conductive patterns, wherein the plurality of conductive patterns includes: a first sensing electrode comprising a plurality of first sensing patterns arranged along a first direction and a plurality of bridge patterns configured to connect adjacent two first sensing patterns of the plurality of first sensing patterns to each other; a second sensing electrode spaced from the first sensing electrode and a plurality of second sensing patterns arranged along a second direction crossing the first direction; and a transparent electrode electrically connected to at least a portion of the first sensing electrode and the second sensing electrode.