Transparent Display Side-Light Layout for High Transmittance and Luminance
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Solution Overview
Problem
In transparent display devices, increasing the area of the transmissive part improves transmittance but reduces the light emitting part's area, leading to decreased luminous efficacy and limited resolution due to the need for the light emitting part to be confined in a limited area.
Innovation Solution
A display device configuration with a first region having a light emitting element emitting light upward, a second region with a reflective structure, and side light generation parts including a second light emitting element between the first and second regions, allowing side light to be transmitted and reflected upward to enhance light emission efficiency without increasing the area of the light emitting parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the area of the transmissive part is increased to improve transmittance, then transmittance is improved but the area of the light emitting part decreases, resulting in luminous efficacy decrease
Solution Approach 1:
The patent introduces side light generation parts that emit light from the side (lateral dimension) rather than only from the top (vertical dimension). This allows the transmissive part to serve dual purposes: maintaining high transmittance while also functioning as a light emitting area when viewed from the side, thereby resolving the contradiction between transmittance and luminous efficacy.
Solution Approach 2:
The transmissive part is designed to perform multiple functions: it serves as both a transmissive region for viewing through the display and a light emitting region when illuminated from the side by side light generation parts. This multi-functionality allows the same area to contribute to both transmittance and luminous efficacy without requiring separate regions.
2Illumination intensity
If the area of the transmissive part is increased to improve transmittance, then transmittance is improved but the area of the light emitting part decreases, resulting in resolution limitation
Solution Approach 1:
By utilizing the lateral dimension for light emission through side light generation parts, the patent enables high resolution along the viewing direction (vertical) while maintaining large transmissive area. The side light emission provides additional information channels that do not compromise the resolution of the main display area.
3Illumination intensity
If side light generation parts are added to improve light emission efficiency, then luminance is increased but device complexity increases
Solution Approach 1:
The side light generation parts are integrated with the existing display structure, sharing common elements such as the substrate, transmissive parts, and control circuits. This merging approach allows the side light emission function to be added without proportionally increasing device complexity, as many components serve dual purposes.
Solution Approach 2:
The same structural elements (substrate, transmissive parts, electrodes) are used for both traditional top-emission display functions and the new side-light emission function. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity while achieving improved luminance.
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
This configuration improves light emission efficiency by utilizing the transmissive part as a light emitting area, increasing luminance and reducing power consumption while maintaining transmittance, and allows for a more efficient use of the display area without adding extra components.
Implementation Method 1
a light emitting element which generates light from a side provided between a light emitting part and a transmissive part
Implementation Method 2
a reflective structure... allowing side light to be transmitted and reflected upward
Data Source
AI summary
A display device according to an embodiment of the present disclosure includes a first region on a substrate, the first region having a first light emitting element emitting light upward, a second region spaced apart from the first region on the substrate, the second region including a reflective structure, and side light generation parts including a second light emitting element disposed between the first region and the second region and transmitting light to the second region.