Display device
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Solution Overview
Problem
Existing display devices with transparent areas face challenges in maintaining high transmittance while ensuring effective external 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 non-display area, incorporating a plurality of conductive patterns including first and second sensing electrodes, bridge patterns, and a transparent electrode, with a cover insulating layer and transparent conductive oxide, to enhance 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 input sensor is divided into multiple sensing electrodes (first sensing electrode and second sensing electrode) with multiple sensing patterns arranged in different directions. This segmentation allows the sensing function to be distributed across multiple transparent conductive elements, reducing the impact of any single conductor on transmittance while maintaining overall sensing sensitivity.
Solution Approach 2:
Different regions of the display panel have different conductor densities. The transmission area has minimal conductive patterns to maximize transmittance, while the pixel areas contain the necessary sensing patterns for touch detection. This local differentiation optimizes both transmittance in the transmission area and sensing sensitivity in the pixel areas.
2Reliability
If transparent electrode is added to electrically connect sensing electrodes, then sensing functionality is improved, but transmittance of the transmission area deteriorates
Solution Approach 1:
The transparent electrode uses transparent conductive oxide (TCO) material with optimized thickness and conductivity parameters. By carefully controlling the TCO layer thickness and electrical properties, the electrode provides sufficient electrical connectivity for sensing functionality while minimizing optical absorption to maintain high transmittance.
Solution Approach 2:
The transparent electrode is formed using transparent conductive oxide composite materials that combine electrical conductivity with optical transparency. This composite material approach allows simultaneous achievement of reliable sensing functionality and high transmittance by selecting TCO materials with optimal electrical and optical properties.
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 design improves external input sensing sensitivity while maintaining high transmittance, allowing for transparent display devices with enhanced user interaction and visibility.
Implementation Method 1
a transparent electrode electrically connected to at least a portion of the first sensing electrode and the second sensing electrode, wherein the transparent electrode overlaps at least a portion of the transmission area
Data Source
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.