Input Sensing Panel Dielectric Stack for Higher Capacitance Variation
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Solution Overview
Problem
Existing display devices face challenges in achieving improved sensing sensitivity and strength for input sensing panels integrated with display panels, particularly due to limitations in capacitance variation between sensing electrodes and external inputs.
Innovation Solution
The input sensing panel is designed with a passivation layer having higher permittivity than the surrounding sensing insulating layer, aligned at a predetermined angle with the conductive layer, and a high refractive index layer, enhancing capacitance variation and sensitivity. The manufacturing process involves simultaneous etching of the conductive and passivation layers to form aligned side surfaces and contact holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional input sensing panel is integrated with a display panel, then the display device can sense external inputs, but the sensing sensitivity is insufficient due to limited capacitance variation
Solution Approach 1:
The patent changes the dielectric constant parameter by introducing a high dielectric constant layer between the sensing electrode and the external input interface. This layer increases the capacitance variation when external inputs are detected, thereby improving sensing sensitivity without requiring changes to the basic sensing panel structure
Solution Approach 2:
The patent uses a composite structure combining the conventional sensing panel layers with an additional high dielectric constant layer. This composite material approach allows the system to maintain the original sensing functionality while enhancing the capacitance variation through the specialized dielectric properties of the added layer
2Manufacturing precision
If the input sensing panel is manufactured through a separate process and then coupled to the display panel, then the sensing panel can be independently optimized, but the manufacturing complexity and alignment precision are reduced
Solution Approach 1:
The patent merges the manufacturing processes of the display panel and input sensing panel into a single integrated process. The sensing electrode, insulating layers, and high dielectric constant layer are formed simultaneously with the display panel structures, eliminating separate coupling steps and improving alignment precision through inherent process integration
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 increases the variation in capacitance between sensing electrodes and external inputs, resulting in a display device with enhanced sensing sensitivity and strength.
Implementation Method 1
This configuration increases the variation in capacitance between sensing electrodes and external inputs
Implementation Method 2
The passivation layer has a permittivity higher than a permittivity of the third sensing insulating layer
Data Source
AI summary
A method of manufacturing a display device, including forming a first sensing insulating layer on a display panel comprising an active area and a peripheral area; forming a first conductive layer on the first sensing insulating layer; forming a second sensing insulating layer to cover the first conductive layer; forming a second conductive layer comprising a conductive material on the second sensing insulating layer; forming a passivation layer on the second conductive layer; substantially simultaneously etching the second conductive layer and the passivation layer through a photolithography process; and forming a third sensing insulating layer to cover the passivation layer. The passivation layer includes an inorganic material.