Display Device with Segmented White EL Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display devices face challenges in achieving high resolution, low power consumption, high contrast, and reliable manufacturing methods, particularly in forming high-resolution display panels with minimal crosstalk and leakage current, which affects image quality and aperture ratio.
Innovation Solution
A display device structure incorporating a first transistor with silicon in the channel formation region, a second transistor with metal oxide, and shared light-emitting elements with a white light-emitting layer, along with coloring layers for red, green, and blue light transmission, and a sacrificial layer to reduce damage during manufacturing, allowing for fine patterning without shadow masks and low leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional manufacturing methods are used for high-resolution display panels, then manufacturing complexity increases, but manufacturing precision and reliability deteriorate due to crosstalk and leakage current
Solution Approach 1:
The light-emitting element is divided into multiple independent light-emitting regions (first, second, third light-emitting elements) with distinct electrodes and encapsulation structures. Each region can be independently controlled and encapsulated, preventing crosstalk between adjacent regions while maintaining high resolution. The segmentation allows each light-emitting element to be separately manufactured and tested, improving overall reliability.
Solution Approach 2:
An insulating layer is introduced as an intermediary between adjacent light-emitting elements and their electrodes. This insulating layer acts as a barrier that prevents electrical crosstalk and leakage current between neighboring elements, thereby improving image quality and reliability without compromising manufacturing precision or requiring complex manufacturing processes.
2Manufacturing precision
If multiple separate EL layers are used for different light-emitting elements, then manufacturing complexity increases, but device complexity and power consumption worsen
Solution Approach 1:
Multiple light-emitting elements share a common EL layer containing a white light-emitting compound. Instead of fabricating separate EL layers for each light-emitting element, the invention uses a single shared EL layer that can be uniformly deposited across all elements. This merging approach reduces manufacturing complexity and device structure complexity while maintaining the ability to achieve high-resolution patterning through selective electrode and encapsulation design.
Solution Approach 2:
The shared EL layer serves multiple functions: it provides the light-emitting function for all light-emitting elements simultaneously, acts as a common barrier layer, and enables uniform material deposition. This multi-functionality reduces the overall number of layers and manufacturing steps required, thereby reducing device complexity while maintaining manufacturing precision.
3Ease of manufacture
If conventional encapsulation methods are used, then manufacturing is simpler, but reliability deteriorates due to damage during manufacturing processes
Solution Approach 1:
The encapsulation structure is designed and formed before final device assembly and testing. The insulating layer and encapsulation layers are deposited early in the manufacturing process, protecting the light-emitting elements from damage during subsequent manufacturing steps such as electrode formation, patterning, and device assembly. This preliminary encapsulation ensures reliability without significantly complicating the manufacturing process.
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 enables high-resolution, low-power, high-contrast displays with reduced manufacturing complexity and increased reliability, achieving deep black display and high aperture ratios while minimizing crosstalk and leakage, thereby enhancing image crispness and contrast.
Implementation Method 1
The EL layer includes a light-emitting layer exhibiting white light. By applying a voltage to this element, light emission can be obtained from the light-emitting organic compound.
Implementation Method 2
a first coloring layer over the first light-emitting element, a second coloring layer over the second light-emitting element, and a third coloring layer over the third light-emitting element. The first coloring layer has a function of transmitting red light, the second coloring layer has a function of transmitting green light, and the third coloring layer has a function of transmitting blue light.
Data Source
AI summary
A display device that has high display quality is provided. A highly reliable display device is provided. A display device with low power consumption is provided and a display device that can easily achieve a higher resolution is provided. A display device with both high display quality and a high resolution is provided. A display device with high contrast is provided. The display device includes a first layer, a second layer over the first layer, and a third layer over the second layer. The first layer includes a first transistor including silicon in a channel formation region. The second layer includes a second transistor including a metal oxide in a channel formation region. The third layer includes a first light-emitting element, a second light-emitting element, a third light-emitting element, an EL layer including a light-emitting layer exhibiting white light, a first coloring layer over the first light-emitting element, a second coloring layer over the second light-emitting element, and a third coloring layer over the third light-emitting element. Crosstalk is not observed between the second light-emitting element and the third light-emitting element.