Light Emitting Display Device Integrating Sensing Unit
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Solution Overview
Problem
Existing display devices lack the capability to integrate sensing functionality within the display area, limiting their ability to detect external inputs while displaying images.
Innovation Solution
A light emitting display device is designed with a sensing unit including a light receiving element positioned next to the display unit in the display area, allowing for both image display and sensing operations without significant structural changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensing unit is integrated into the display area, then sensing capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the sensing unit with the display unit by positioning the light receiving element adjacent to the light emitting element within the same display area. The color filter layer serves dual purposes: it filters light for display pixels while also allowing light transmission to the light receiving element for sensing operations. This integration enables both display and sensing functions within a single unified structure, improving versatility without proportionally increasing complexity.
Solution Approach 2:
The color filter layer is designed to perform multiple functions simultaneously: it acts as a light filtering element for the display function while also serving as a light transmission medium for the sensing function. The display pixel structure supports both light emission for display and light reception for sensing operations, creating a multi-functional component that addresses both display and sensing requirements within the same structural framework.
2Adaptability or versatility
If a light receiving element is positioned next to the display unit, then sensing functionality is improved, but manufacturing complexity increases
Solution Approach 1:
The display area is segmented into distinct functional zones: light emitting elements for display, light receiving elements for sensing, and color filter layers that serve both functions. This segmentation allows each component to be optimized for its specific function while maintaining a relatively simple overall manufacturing process, as each segment can be fabricated using standard display manufacturing techniques.
Solution Approach 2:
The color filter layer exhibits local quality variations: it has light-blocking properties in regions corresponding to display pixels and light-transmitting properties in regions corresponding to sensing elements. This spatially varying optical property allows the same layer to serve dual purposes, simplifying manufacturing by using a single layer structure rather than requiring separate layers for display and sensing functions.
3Adaptability or versatility
If sensing and display operations are integrated, then interactive capability is improved, but structural complexity increases
Solution Approach 1:
The sensing unit is nested within the display area structure, with the light receiving element positioned adjacent to and integrated with the light emitting element. The color filter layer envelops both the light emitting and light receiving elements, creating a nested configuration where sensing functionality is embedded within the display structure. This nesting approach enables interactive capabilities while minimizing the increase in overall structural complexity.
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 integration of a sensing unit enables the detection of user inputs such as touch, light, heat, or pressure, enhancing the interactive capabilities of the display device without compromising its display functionality.
Implementation Method 1
The first light emitting layer and the second light emitting layer may emit blue light
Implementation Method 2
a light receiving element electrically connected to the light sensing circuit unit
Data Source
AI summary
A light emitting display device includes a pixel circuit and light sensing circuit unit on a substrate, light emitting elements connected to the pixel circuit unit and including a first and second electrode and a light emitting layer, a light receiving element connected to the light sensing circuit unit and including a first and second electrode and a sensing layer, a first color conversion layer on the light emitting elements, a transparent layer on the light emitting and receiving elements, and a color filter on the first color conversion layer and first transparent layer. The first electrode of the light emitting elements and the light receiving element are located on a same layer, the second electrode of the light emitting elements and light receiving element are located on a same layer and electrically connected, and the light emitting layers and the sensing layer are located on a same layer.