Display Device Sensor Integration via Vertical Substrate Separation
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Solution Overview
Problem
The challenge is to integrate sensors into display devices without compromising their accuracy, resolution, or display functions, particularly in thin and compact designs where sensors need to be embedded within the display region without overlapping with spacers or light-emitting regions.
Innovation Solution
The display device design includes a substrate with a driving layer, a self-emitting layer, sensors positioned adjacent to the substrate away from the driving layer, and a pixel defining layer with spacers that do not overlap the sensors in the normal direction, ensuring that the sensors do not interfere with the light-emitting regions or touch electrodes, thus maintaining the display's functionality and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If sensors are embedded into the display region to increase display-to-body ratio, then the display device achieves higher compactness and thinner profile, but the sensor accuracy and resolution may be compromised due to interference from display structures
Solution Approach 1:
The patent positions sensors in the vertical dimension below the substrate, while display structures (pixel defining layer, spacers, light-emitting regions) occupy the vertical space above the substrate. This dimensional separation allows sensors to be embedded in the display region without spatial interference from display structures, maintaining both high display-to-body ratio and sensor accuracy
Solution Approach 2:
The substrate serves as an intermediary layer that physically separates the sensors from the display structures. By placing sensors adjacent to the substrate's second surface while display structures are formed above the substrate's first surface, the substrate acts as a mediator that enables co-location in the display region without direct interference, preserving sensor functionality
2Length of moving object
If sensors are positioned close to the substrate to maintain thin device profile, then the device achieves greater thinness, but the sensors may interfere with light-emitting regions or touch electrodes
Solution Approach 1:
The patent utilizes the vertical dimension to separate sensors from potentially interfering structures. Sensors are positioned adjacent to the second surface of the substrate, while light-emitting regions and touch electrodes are formed above the first surface of the substrate, eliminating interference while maintaining thin overall device profile
Solution Approach 2:
The patent applies different spatial arrangements to different functional regions: sensors are localized adjacent to the substrate's second surface in areas where they do not overlap with light-emitting regions or touch electrodes in the vertical direction, allowing local optimization of both thinness and functional independence
Data Source
AI summary
A display device is provided, which has a display region and includes: a substrate having a first surface and a second surface; a driving layer disposed on the first surface; a self-emitting layer disposed on the driving layer and including a reflective electrode; a plurality of sensors overlapping the display region in a normal direction of the first surface; a pixel defining layer disposed on the reflective electrode, wherein the pixel defining layer comprises a top surface and a bottom surface facing the driving layer; a spacer disposed on the top surface; and a plurality of first touch electrodes and second touch electrodes disposed in the display region, wherein in the normal direction of the first surface, at least two sensors overlaps one of the first touch electrodes or one of the second touch electrodes; wherein the sensors are adjacent to the second surface away from the driving layer.