Display Device with Self-Assembled Light-Emitting Pixels for Sensing
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Solution Overview
Problem
Existing display devices face challenges in aligning ultra-small light-emitting devices onto substrates for high-resolution displays and implementing bezel-less sensing technologies due to complexity, cost, and accuracy issues with infrared, camera, and electrostatic capacitance touch technologies.
Innovation Solution
A display device utilizing semiconductor light-emitting devices with integrated sensing elements, employing a self-assembly method for precise alignment and a circuit block for emission and sensing modes, allowing for bezel-less operation with integrated sensors like external light-sensitive, proximity, touch, and fingerprint sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional sensing technologies (infrared, camera, electrostatic capacitance) are used, then sensing functions can be implemented, but device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent merges the sensing function with the display pixel structure by integrating a light-receiving unit into the same substrate and pixel area where light-emitting devices are disposed. This combination eliminates the need for separate sensing systems (infrared cameras, electrostatic electrodes) and reduces overall device complexity while maintaining multiple sensing capabilities including touch detection and ambient light sensing
Solution Approach 2:
The light-receiving unit serves multiple functions: it acts as both a component of the display pixel structure and a sensing element for touch detection, proximity sensing, and ambient light detection. This multi-functionality reduces the need for dedicated separate sensing components, thereby reducing device complexity and manufacturing cost
2Manufacturing precision
If numerous light-emitting devices are aligned to each pixel manually, then alignment precision can be controlled, but manufacturing time and cost increase significantly
Solution Approach 1:
The patent employs a self-assembly method where light-emitting devices automatically align to predetermined pixel positions on the substrate through magnetic or electrostatic forces during the assembly process. This self-alignment mechanism eliminates the need for complex manual alignment operations, significantly improving manufacturing efficiency while maintaining high precision through the predetermined pixel pattern guidance
3Area of stationary object
If bezel-less design is implemented with conventional sensing technologies, then display area increases, but sensing accuracy decreases due to long distances from sensors to center
Solution Approach 1:
By merging the light-receiving unit with the pixel structure and positioning it within the display area rather than at the periphery, the patent enables sensing elements to be located close to the center of the display. This integration allows accurate sensing (touch, proximity, ambient light) even in bezel-less designs where the distance between sensors and the center of the display is minimized
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
Enables high-resolution displays with integrated sensing functions without increasing thickness, reducing costs, and improving sensing accuracy through precise alignment and efficient use of semiconductor light-emitting devices.
Implementation Method 1
The light-emitting diodes are attracting attention as a light source for next-generation display devices because they exhibit excellent durability even under harsh environmental conditions and have long lifespans and high brightness
Implementation Method 2
a fourth semiconductor light-emitting device that generates a first sensing signal corresponding to internal light or external light by a power source having a reverse bias
Data Source
AI summary
A display device may include first to third semiconductor light-emitting devices in each of a plurality of pixels, a sensing element, and a circuit block in each of the plurality of pixels. The sensing element may include a fourth semiconductor light-emitting device. The first to third semiconductor light-emitting devices may emit light during the first section by a power source having a forward bias. The fourth semiconductor light-emitting device may be light-received by a power source having a reverse bias.