Display Device Common Layer Touch Sensing Integration
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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 reducing pixel density.
Innovation Solution
A display device incorporating a light-emitting element and a light-receiving element with a common layer, where the light-emitting element includes a pixel electrode, a functional layer, a light-emitting layer, and a common electrode, and the light-receiving element includes a pixel electrode, a functional layer, and a light-receiving layer, allowing for separate formation of light-emitting and light-receiving layers without a shadow mask, enabling high-resolution and high-aperture displays with integrated touch sensing and authentication capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate light-emitting and light-receiving layers are formed without a shadow mask, then manufacturing precision and aperture ratio are improved, but device complexity increases
Solution Approach 1:
The display device is segmented into distinct light-emitting elements and light-receiving elements with separate functional layers. Each element has its own pixel electrode, functional layer, and active layer (light-emitting or light-receiving), allowing independent optimization and formation without shadow masks, thereby improving manufacturing precision and aperture ratio.
Solution Approach 2:
The common layer serves multiple functions: it acts as the third functional layer for both light-emitting and light-receiving elements, provides a shared common electrode interface, and enables both emission and detection functions within the same device structure. This multi-functionality reduces the need for additional separate components while maintaining high manufacturing precision.
2Adaptability or versatility
If touch sensing and authentication functions are integrated into the display device, then device versatility is improved, but device complexity increases
Solution Approach 1:
The light-receiving element serves dual purposes: it functions as both a display component (replacing traditional LCD layers) and as a touch sensor for contactless sensing and fingerprint authentication. This multi-functionality integrates touch sensing and authentication capabilities into the display structure without adding separate sensor components, thereby improving versatility while controlling device complexity.
Solution Approach 2:
The touch sensing function is merged with the light-receiving element by utilizing the same pixel electrode, functional layer, and active layer structure. The light-receiving layer detects both display light and touch-related light patterns, combining display and sensing functions into a single integrated component rather than using separate layers.
3Productivity
If miniaturized subpixels are used to maintain high pixel density, then display quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
Each pixel is segmented into distinct light-emitting and light-receiving subelements with clearly defined boundaries. The separate formation process without shadow masks allows each subelement to be precisely patterned independently, maintaining high pixel density while reducing alignment complexity compared to traditional multi-layer approaches.
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 display device with high aperture ratio, miniaturized subpixels, and integrated touch sensing and authentication functions, maintaining high pixel density and display quality, even in dark environments, by eliminating the need for external sensors and reducing component count.
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 second functional layer, a light-receiving layer
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 functional layer, a light-emitting layer, a common layer, and a common electrode. The light-receiving element includes a second pixel electrode, a second functional layer, a light-receiving layer, the common layer, and the common electrode. The first functional layer includes one of a hole-injection layer and an electron-injection layer. The second functional layer includes one of a hole-transport layer and an electron-transport layer. The common layer has a function of the other of the hole-injection layer and the electron-injection layer in the light-emitting element and has a function of the other of the hole-transport layer and the electron-transport layer in the light-receiving element.