Display Device Pixel Region Segmentation for Luminous Efficiency
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Solution Overview
Problem
Display devices exhibit low current consumption efficiency due to decreased luminous efficiency in red and green pixels, primarily caused by electron and hole recombination issues in existing structures where the second blue light-emitting layer is shared across all pixels, leading to current loss and reduced productivity.
Innovation Solution
A display device structure with distinct pixel regions for red, green, and blue light-emitting layers, where the second electric charge injection layer is only provided in the blue pixel region, and the second blue light-emitting layer is strategically placed to minimize recombination in red and green pixels, enhancing current efficiency and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the second blue light-emitting layer is formed directly on the red light-emitting layer and the green light-emitting layer, then the device structure is simplified, but the luminous efficiency of the red and green pixels decreases due to electron and hole recombination in the second blue light-emitting layer
Solution Approach 1:
The display device is divided into three distinct pixel regions (red, green, and blue) with different layer configurations. The second blue light-emitting layer is segmented to be provided only in the blue pixel region, while the red and green pixel regions have their own dedicated light-emitting layers without the second blue light-emitting layer, thereby preventing unwanted recombination losses.
Solution Approach 2:
Different pixel regions are assigned different local structures: the blue pixel region includes the second blue light-emitting layer for enhanced blue light emission, while the red and green pixel regions exclude this layer to maintain their luminous efficiency. This local differentiation allows each region to optimize its performance characteristics.
2Reliability
If electrons and holes are generated in the charge generation layer provided in the red and green pixels, then charge generation is enabled, but current loss occurs due to recombination in the charge generation layer, reducing luminous efficiency
Solution Approach 1:
The charge generation layer is extracted or removed from the red and green pixel regions. By eliminating this layer in non-blue pixels, the patent prevents the generation and subsequent recombination of electron-hole pairs that would cause current loss, while blue pixels retain the charge generation layer for their specific operational requirements.
3Loss of energy
If the second blue light-emitting layer is provided only in the blue pixel region, then recombination losses in red and green pixels are reduced, but device complexity increases due to region-specific layer configurations
Solution Approach 1:
The device is segmented into distinct pixel regions with customized layer structures. Each pixel type (red, green, blue) has a tailored configuration that optimizes its performance while minimizing unwanted effects like recombination losses in non-blue regions.
4Productivity
If a shared second blue light-emitting layer is used across all pixels, then manufacturing productivity is improved, but luminous efficiency of red and green pixels decreases
Solution Approach 1:
Rather than using a single shared second blue light-emitting layer across all pixels, the structure is segmented so that this layer is only present in blue pixel regions. This segmentation prioritizes optical performance over manufacturing simplicity, accepting reduced productivity to achieve superior luminous efficiency in red and green pixels.
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
The proposed structure significantly improves current consumption efficiency by reducing recombination losses in red and green pixels, leading to higher luminous efficiency and extended device lifespan while maintaining high productivity.
Implementation Method 1
a first photoelectric conversion layer including a first light-emitting layer that emits light of a first color, a second light-emitting layer that emits light of a second color that differs from the first color, and a third light-emitting layer that emits light of a third color that differs from the first color and the second color
Data Source
AI summary
A display device has a display area including a first pixel region, a second pixel region, and a third pixel region. The display device includes: a first electrode; a first photoelectric conversion layer including a first light-emitting layer, a second light-emitting layer, and a third light-emitting layer; a first electric charge injection layer; a second electric charge injection layer; a second photoelectric conversion layer including a fourth light-emitting layer; and a second electrode. The first light-emitting layer is provided in the first pixel region. The second light-emitting layer is provided in the second pixel region. The third light-emitting layer is provided in the third pixel region. The first electric charge injection layer is provided across the entire display area. The second electric charge injection layer is provided only in the third pixel region. The fourth light-emitting layer is provided at least in the third pixel region.