Dual-Sided Display Pixel Layout for Independent Front and Rear Emission
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Solution Overview
Problem
Current display devices are limited in their ability to independently drive and display images on both surfaces, lacking a solution for efficient dual-sided emission without interference between rear and front emission pixels.
Innovation Solution
A double-sided display device design featuring a lower metal layer, electrodes, light emitting elements, and a reflective layer, where the first and second light emitting elements are spaced apart by electrodes, and a reflective layer overlaps the first light emitting elements, allowing for independent driving of rear and front emission pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single display panel is used for both surfaces, then device complexity is reduced, but the ability to independently drive and display images on both surfaces is limited
Solution Approach 1:
The display panel is segmented into front emission pixels and rear emission pixels, with each pixel type having dedicated light emitting elements (first and second light emitting elements) and control electrodes. This segmentation allows independent control of front and rear displays while using a single integrated panel structure, resolving the contradiction between structural simplicity and independent driving capability.
Solution Approach 2:
Different regions of the display panel are assigned different functional qualities: the front surface has front emission pixels optimized for front viewing, while the rear surface has rear emission pixels with reflective layers optimized for rear viewing. This local differentiation enables independent driving of both surfaces while maintaining a unified panel structure.
2Area of stationary object
If light emitting elements are closely arranged for high resolution, then area utilization is improved, but interference between rear and front emission pixels increases
Solution Approach 1:
Electrodes are positioned between the first light emitting elements (front emission) and second light emitting elements (rear emission) to act as an intermediary structure. This spatial arrangement with electrodes in between helps prevent light and electrical interference between the two emission types, allowing high-density arrangement without cross-interference.
Solution Approach 2:
The patent utilizes the vertical dimension (thickness direction) to separate front and rear emission functions. First light emitting elements are disposed between first and second electrodes, while second light emitting elements are disposed between first and third electrodes, creating vertical layering that prevents interference while maximizing area utilization.
3Illumination intensity
If a reflective layer is added to enhance rear emission, then rear display brightness is improved, but manufacturing complexity increases
Solution Approach 1:
The reflective layer serves multiple functions: it enhances rear emission brightness by reflecting light backward, provides structural support between layers, and acts as an optical barrier to prevent light leakage. This multi-functionality justifies the additional layer while minimizing the net increase in manufacturing 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
Enables efficient dual-sided emission by allowing independent control of rear and front emission pixels, enhancing display capabilities by enabling images to be displayed on both surfaces of the device.
Implementation Method 1
a reflective layer disposed on the first light emitting elements and overlapping the rear emission pixel in a plan view
Implementation Method 2
first light emitting elements disposed between the first electrode and the second electrode disposed in the rear emission pixel; second light emitting elements disposed between the first electrode and the second electrode disposed in the front emission pixel
Data Source
AI summary
A display device includes a lower metal layer disposed on a surface of a substrate and including a first opening overlapping a rear emission pixel in a plan view; a first electrode and a second electrode disposed in each of the rear emission pixel and a front emission pixel, the first electrode and the second electrode being spaced apart from each other on the lower metal layer; first light emitting elements disposed between the first electrode and the second electrode disposed in the rear emission pixel; second light emitting elements disposed between the first electrode and the second electrode disposed in the front emission pixel; and a reflective layer disposed on the first light emitting elements and overlapping the rear emission pixel in a plan view, the reflective layer overlaps at least one of the first light emitting elements in a plan view.