Display Device Electrode Area Ratio Optimization
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Solution Overview
Problem
Display devices with touch panels face a trade-off between reducing electric resistance of detecting electrodes for improved detection performance and maintaining transmittance for visible light, as conductive materials like metal or alloy used to lower resistance result in light-shielding properties that degrade transmittance.
Innovation Solution
The use of a display device configuration with a substrate, pixels, and electrodes arranged in specific patterns, including metal or alloy layers, where the ratio of overlapping areas of certain electrodes to total pixel areas is optimized to improve detection performance while minimizing light-shielding effects, and the inclusion of conductive lines with zigzag or mesh-like shapes to enhance conductivity and reduce electric resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive materials such as metal or alloy are used for detecting electrodes, then electric resistance is reduced and detection performance is improved, but transmittance with respect to visible light is degraded due to light-shielding properties
Solution Approach 1:
The patent applies local quality by making the detecting electrode transparent in the display region while maintaining conductive properties. Specifically, the electrode material is selectively applied only in non-display regions or arranged in a pattern that provides conductivity where needed while allowing light transmission in the display area, thus resolving the contradiction between requiring conductive materials for detection performance and maintaining transmittance in the display region.
Solution Approach 2:
The detecting electrode is segmented into multiple regions with different properties: transparent regions in the display area and conductive regions in non-display areas. This segmentation allows the electrode to simultaneously achieve both light transmittance in the display region and sufficient conductivity for detection performance by separating these conflicting requirements into different spatial zones.
2Measurement precision
If the area ratio of overlapping electrodes is increased to improve detection sensitivity, then detection performance is enhanced, but light-shielding effects and glare are intensified
Solution Approach 1:
The patent applies parameter changes by optimizing the area ratio of overlapping electrodes to a specific range (1-22% of total pixel area). This parameter optimization balances detection sensitivity with light transmittance, ensuring that the electrode overlap provides sufficient capacitive coupling for accurate touch detection while maintaining high visibility and minimizing glare in the display region.
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 enhances the detection performance and maintains high transmittance for visible light, reducing the risk of light-shielding and glare in the display region, thereby improving the overall user experience.
Implementation Method 1
the electrostatic capacitance method. In an electrostatic capacitive touch panel, a plurality of capacitive elements each made up of a pair of electrodes disposed to be opposed to each other with a dielectric layer interposed therebetween
Implementation Method 2
conductive materials such as metal or alloy have light-shielding properties with respect to visible light
Data Source
AI summary
A display device includes: a plurality of pixel electrodes each of which is provided in each of a plurality of sub-pixels arranged in a display region; a driving electrode provided so as to overlap the plurality of pixel electrodes when seen in a plan view; a plurality of detecting electrodes provided so as to overlap the driving electrode when seen in a plan view; and a dummy electrode provided apart from the detecting electrodes. The detecting electrodes and the dummy electrode include a metal layer or an alloy layer. A ratio of total sum of areas of portions of the plurality sub-pixels which overlap any of the detecting electrodes and the dummy electrode when seen in a plan view to total sum of areas of the plurality of sub-pixels is 1 to 22%.