Display Device With Shared Injection Layer For Touch Sensing
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Solution Overview
Problem
Current display devices face challenges in achieving high aperture ratio, miniaturization, and integration of touch sensing and authentication functions without increasing complexity or component count.
Innovation Solution
A display device comprising a light-emitting element and a light-receiving element with a common layer functioning as either a hole-injection or electron-injection layer, allowing for fine patterning without shadow masks, enabling high pixel density and touch sensing capabilities while reducing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch sensing and authentication functions are integrated into display devices, then device functionality is improved, but device complexity increases
Solution Approach 1:
The patent combines touch sensing and authentication functions with the display function by integrating light-emitting and light-receiving elements directly into the display panel structure, eliminating the need for separate sensing components and reducing overall device complexity
Solution Approach 2:
The display panel serves multiple functions simultaneously: displaying images through light-emitting elements and detecting touch/input through light-receiving elements, allowing a single component to perform both display and sensing operations
2Manufacturing precision
If shadow masks are used for patterning light-emitting layers, then manufacturing precision is improved, but device complexity and component count increase
Solution Approach 1:
The patent removes the shadow mask component entirely from the manufacturing process by using direct patterning methods to form light-emitting and light-receiving layers, eliminating the need for shadow masks while maintaining manufacturing precision
Solution Approach 2:
The patent replaces the mechanical shadow mask system with a direct deposition or patterning system that forms layers without requiring physical masks, substituting a complex mechanical component with a simpler manufacturing approach
3Illumination intensity
If aperture ratio is increased to improve display quality, then display quality is improved, but area for sensing functions is reduced
Solution Approach 1:
The patent transitions from planar arrangement to three-dimensional stacking by placing light-emitting and light-receiving elements in different layers, allowing both display and sensing functions to coexist without competing for the same surface area
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 enables a compact, high-aperture-ratio display device capable of touch sensing and authentication, with improved display quality and reliability by integrating sensing functions within the display panel.
Implementation Method 1
light-emitting elements (also referred to as EL elements or EL devices) utilizing an electroluminescence (EL) phenomenon
Implementation Method 2
a light-receiving element includes a second pixel electrode, a light-receiving layer over the second pixel electrode
Data Source
AI summary
A display device having a function of detecting an object that is in contact with or approaches a display portion is provided. The display device includes a light-emitting element and a light-receiving element. The light-emitting element includes a first pixel electrode, a first light-emitting layer over the first pixel electrode, an intermediate layer over the first light-emitting layer, a second light-emitting layer over the intermediate layer, and a common electrode over the second light-emitting layer. The light-receiving element includes a second pixel electrode, a light-receiving layer over the second pixel electrode, and the common electrode over the light-receiving layer. The first light-emitting layer and the second light-emitting layer have a function of emitting light of the same color.