Dual-Emission Pixel Structure for High-PPI Display Efficiency
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Solution Overview
Problem
As the size of light-emitting elements in display panels decreases, their external quantum efficiency is adversely affected, leading to decreased display quality due to increased leakage current and nonradiative recombination, particularly evident in red light-emitting diodes.
Innovation Solution
The display panel incorporates a pixel unit with a first sub-pixel comprising a light-emitting element, a light source element, and a color conversion structure, where the color conversion structure is disposed on the light source element to convert its emitted light into a color matching that of the light-emitting element, thereby enhancing luminous efficiency and compensating for the efficiency loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the size of light-emitting element is reduced to increase pixels per inch, then display resolution is improved, but external quantum efficiency of light-emitting element decreases
Solution Approach 1:
The pixel structure is segmented into multiple light-emitting elements (first light-emitting element, second light-emitting element) with different functions. The first light-emitting element is optimized for high efficiency while the second provides color diversity, allowing the system to achieve high resolution without sacrificing the efficiency of individual elements.
Solution Approach 2:
A color conversion structure is introduced as an intermediary component that converts light from the first light-emitting element into different colors. This mediator allows the system to achieve color diversity without relying solely on multiple small light-emitting elements, thereby preserving the external quantum efficiency of the primary light-emitting element.
2Productivity
If the size of light-emitting element is reduced, then pixels per inch is increased, but leakage current and nonradiative recombination increase
Solution Approach 1:
The pixel is divided into multiple light-emitting elements where the first light-emitting element can be larger and optimized for reliability, while the second light-emitting element provides additional functionality. This segmentation allows maintaining larger, more reliable light-emitting elements while still achieving high pixel density through the combined structure.
Solution Approach 2:
The invention changes the parameters of light-emitting elements by using different materials or structures for the first and second light-emitting elements. This allows optimization of the first element for high reliability and efficiency, while the second element is optimized for color diversity, thereby maintaining overall system reliability at high PPI.
3Device complexity
If a single light-emitting element is used per pixel, then device complexity is reduced, but luminous efficiency decreases
Solution Approach 1:
The pixel is segmented into multiple light-emitting elements with specialized functions. The first light-emitting element is optimized for high luminous efficiency, while the second light-emitting element provides color conversion capability. This functional segmentation allows the system to achieve high luminous efficiency without excessive complexity by assigning specific roles to each element.
Solution Approach 2:
The first light-emitting element serves multiple functions: it provides primary light emission with high efficiency and also serves as the light source for the color conversion structure. This multi-functionality reduces the need for separate dedicated light sources, thereby limiting the increase in device complexity while improving luminous efficiency.
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 the luminous efficiency and color gamut of the display panel by utilizing two light-emitting means to present colors, specifically red, green, and blue, while maintaining high resolution and reducing current density, thus enhancing display quality.
Implementation Method 1
The first color conversion structure is disposed on the first light source element and adapted to convert a light emitted by the first light source element into a light of the first color
Data Source
AI summary
A display panel includes a pixel unit. The pixel unit includes a first sub-pixel and a second sub-pixel. The first sub-pixel includes a first light-emitting element, a first light source element, and a first color conversion structure. A light emitted by the first light-emitting element has a first color. The first color conversion structure is disposed on the first light source element and adapted to convert a light emitted by the first light source element into a light of the first color. The second sub-pixel includes a second light-emitting element. A light emitted by the second light-emitting element has a second color different from the first color.