Dual-Substrate Touch Display Structure for Transmittance and Sensitivity
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Solution Overview
Problem
The integration of input device electrodes with display device electrodes leads to issues such as increased resistance, reduced visible light transmittance, and compromised detection sensitivity due to shared formation on a common substrate, complicating the wiring structure and manufacturing process.
Innovation Solution
The input position detection electrodes are formed on a separate substrate facing the display device, allowing for separate manufacturing and adjustment of electrostatic capacity, reducing resistance and improving detection sensitivity while simplifying the wiring structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electrode for the input device is formed on the substrate of the display device, then the display device structure is simplified, but the resistance value increases and visible light transmittance reduces
Solution Approach 1:
The patent divides the display device into two separate substrates: a display substrate and an input device substrate. The input device substrate is attached to the display substrate, allowing independent formation and optimization of electrodes for each function. This segmentation resolves the contradiction by enabling high-quality electrode formation for the input device without compromising the display substrate's integrity or optical properties.
2Device complexity
If the electrode for the input device is formed on the substrate of the display device, then the display device structure is simplified, but visible light transmittance reduces
Solution Approach 1:
By separating the input device electrode formation from the display substrate, the patent allows the display substrate to maintain its optimal optical properties. The input device substrate can be specifically optimized for electrical conductivity without compromising light transmittance, as each substrate can be independently designed for its primary function.
3Length of stationary object
If the display device is made thinner, then the display device structure is improved, but detection sensitivity of the input position reduces
Solution Approach 1:
The patent transitions from a single-substrate planar structure to a dual-substrate three-dimensional structure. By attaching the input device substrate to the display substrate, the electrodes can be positioned on opposite sides of the display device thickness, maintaining adequate separation distance even in thin-profile devices. This dimensional approach preserves electrostatic capacity and detection sensitivity while achieving thin device form factor.
4Reliability
If a high temperature process is applied to form the electrode for the input device, then the electrode quality is improved, but the display functional layer is damaged
Solution Approach 1:
The patent separates the electrode formation process from the display substrate by using a separate input device substrate. This allows high-temperature processes to be applied to the input device substrate without damaging the display functional layer, as the display substrate and its sensitive components remain unaffected by the elevated temperatures during electrode formation.
5Length of stationary object
If the distance between the electrodes for detecting input positions is shortened, then the display device thickness is reduced, but electrostatic capacity increases and detection sensitivity decreases
Solution Approach 1:
The patent uses the third dimension (depth/thickness) to separate the input device electrodes from the display substrate. By positioning electrodes on opposite sides of the display device thickness rather than reducing lateral distance, the design maintains adequate electrostatic separation while achieving thin-profile construction. This dimensional approach decouples the relationship between device thickness and electrode separation distance.
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 approach enhances the reliability and manufacturing efficiency of the display device with an input device by minimizing resistance, maintaining visible light transmittance, and optimizing electrostatic capacity, while reducing the risk of substrate damage and corrosion.
Implementation Method 1
a plurality of input position detection electrodes which form an electrostatic capacity in a space with a common electrode of the display device so as to detect an input position
Data Source
AI summary
A display device is provided and includes display part having first and second electrodes; and input part having substrate and detection electrode between substrate and display part, wherein display part including display area that displays image, input part including conductive layer provided between substrate and display part and overlapping detection electrode in display area, detection electrode is glued to conductive layer which has first region outside display area, first regain overlapping substrate and not overlapping detection electrode.