Display Device Light Shielding Grooves Prevent Color Mixing
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Solution Overview
Problem
In organic electroluminescence display devices, light emitted from one light emitting element can enter adjacent elements, causing chromaticity shifts and color mixing, which affects the desired color purity and brightness of pixels.
Innovation Solution
A display device manufacturing method involving a light shielding layer formed in grooves between light emitting elements, with a specific structure of interlayer insulation layers and light reflecting layers to prevent light entry into adjacent elements, using a self-alignment method to micronize the light emitting elements and ensure proper alignment of the shielding layer with respect to the light reflecting layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are arranged closely to reduce pixel pitch, then high resolution is achieved, but light from one element enters adjacent elements causing color mixing
Solution Approach 1:
A light shielding layer is introduced as an intermediary substance between adjacent light emitting elements. This layer acts as a barrier that blocks light from one element from entering neighboring elements, thereby preventing color mixing while maintaining the fine pixel pitch required for high resolution displays.
Solution Approach 2:
The space between adjacent light emitting elements is segmented by forming grooves and filling them with light shielding material. This segmentation physically divides the optical paths of neighboring elements, ensuring that light from each element remains confined to its designated area and does not interfere with adjacent elements.
2Object-affected harmful factors
If a light shielding layer is formed between light emitting elements, then color purity is improved, but device structure becomes more complex
Solution Approach 1:
The light shielding layer formation process is merged with the existing interlayer insulation layer structure. The light shielding material is integrated into the groove structures that are already part of the device architecture, combining the light shielding function with the insulation function to minimize additional structural complexity.
Solution Approach 2:
The interlayer insulation layers serve multiple functions: they provide electrical insulation between different conductive layers and simultaneously serve as the structural framework for accommodating the light shielding layer. This multi-functionality reduces the need for separate dedicated light shielding structures.
3Object-affected harmful factors
If grooves are etched to form light shielding layer, then light entry prevention is improved, but manufacturing process becomes more complex
Solution Approach 1:
The grooves for accommodating the light shielding layer are formed in advance during the interlayer insulation layer formation process, before the light shielding material is deposited. This preliminary action allows the groove structures to be integrated into the existing manufacturing flow without requiring separate post-processing steps.
Solution Approach 2:
The groove structures self-align with the light emitting elements through the self-alignment method, where the groove positions are automatically determined by the underlying layer patterns. This self-alignment eliminates the need for additional alignment steps and simplifies 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
The solution effectively prevents light entry between elements, maintaining desired chromaticity and brightness, enhancing color purity and widening the color gamut by reducing color mixing and ensuring reliable contact prevention between grooves and light reflecting layers.
Implementation Method 1
a light reflecting layer is formed below a first electrode including a transparent electrode, and a second electrode including a semi-light transmitting material and the light reflecting layer constitute a resonator structure. In addition, light emitted from a light emitting layer is resonated between the light reflecting layer and the second electrode, and a part of the light is emitted from the second electrode.
Implementation Method 2
a second electrode including a semi-light transmitting material and the light reflecting layer constitute a resonator structure. In addition, light emitted from a light emitting layer is resonated between the light reflecting layer and the second electrode, and a part of the light is emitted from the second electrode.
Data Source
AI summary
A display device includes a plurality of pixels each including a first light emitting element with a first light reflecting layer, a second light emitting element with a second light reflecting layer, and a third light emitting element with a third light reflecting layer, arranged in a two-dimensional matrix. Each of the light emitting elements includes a first electrode, an organic layer, and a second electrode. Grooves that each have a light shielding layer are formed in a boundary region between the light emitting elements. A bottom of the first groove and a bottom of the third groove are located at a position higher than a top surface of the first light reflecting layer. A bottom of the second groove is located at a position higher than a top surface of the second light reflecting layer.