Inorganic Display Electrode Layout for Touch and Force Sensing
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Solution Overview
Problem
Inorganic electroluminescent displays with inorganic light-emitting diodes lack effective integration of touch detection and force detection functions, which are essential for modern interactive surfaces, and existing solutions do not efficiently combine these capabilities with high environmental resistance and light use efficiency.
Innovation Solution
A display apparatus with a detection device that incorporates a substrate with inorganic light-emitting elements, a first electrode, a planarizing layer, and a second electrode, where the second electrode outputs signals corresponding to changes in distance, enabling both touch and force detection through capacitive sensing, thereby integrating touch and force detection functions while maintaining high light use efficiency and environmental resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If inorganic light-emitting elements are used for display, then light use efficiency and environmental resistance are improved, but touch detection and force detection functions are not effectively integrated
Solution Approach 1:
The patent merges the display function and detection function into a single integrated structure. The inorganic light-emitting elements are positioned between two electrodes (first electrode facing the display surface, second electrode facing the backlight surface), creating a unified component that simultaneously enables light emission and capacitive detection without requiring separate touch sensor layers.
Solution Approach 2:
The inorganic light-emitting elements and surrounding structure serve multiple functions: they act as light-emitting display elements and simultaneously function as capacitive sensors for detecting both touch (distance) and force (pressure). The same physical structure enables display, touch detection, and force detection without requiring additional specialized components.
2Adaptability or versatility
If separate touch detection and force detection devices are added, then detection functions are improved, but device complexity increases
Solution Approach 1:
The patent combines touch detection and force detection into a single capacitive sensing system. Both detection functions utilize the same electrode structure and detection mechanism, differing only in the magnitude of capacitance change detected, thereby avoiding the need for separate detection devices and reducing overall system complexity.
Solution Approach 2:
The electrode structure and detection system serve universal purposes: they detect both touch (proximity) and force (pressure) using the same hardware components. The system distinguishes between touch and force based on the degree of capacitance change rather than requiring different detection mechanisms.
3Adaptability or versatility
If organic light-emitting diodes are used, then touch detection function can be integrated, but environmental resistance decreases
Solution Approach 1:
The patent changes the material parameter from organic light-emitting diodes to inorganic light-emitting elements. This material substitution maintains the ability to integrate touch and force detection functions while significantly improving environmental resistance, as inorganic materials are inherently more stable and resistant to degradation from moisture, oxygen, and mechanical stress.
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 solution effectively enables simultaneous touch and force detection on the display surface, enhancing user interaction while maintaining the environmental resistance and light efficiency of inorganic electroluminescent displays.
Implementation Method 1
a second electrode facing the second principal surface of the substrate and configured to output a signal corresponding to a change in distance between the second electrode and the first electrode
Data Source
AI summary
A display apparatus with a detection device comprising: a substrate having a first principal surface and a second principal surface opposite to the first principal surface; a plurality of inorganic light-emitting elements provided on the first principal surface in a display region of the substrate; a first electrode facing the first principal surface of the substrate with the inorganic light-emitting elements interposed between the first electrode and the first principal surface; a first planarizing layer provided between the substrate and the first electrode and covering at least a side surface of the inorganic light-emitting elements; and a second electrode facing the second principal surface of the substrate and configured to output a signal corresponding to a change in distance between the second electrode and the first electrode.