Organic Light-Emitting Layer Eliminates Blue Color Filter
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Solution Overview
Problem
The transmission efficiency of blue color filters in organic light emitting diode displays is low, affecting color stability and increasing manufacturing complexity due to the need for multiple color filters.
Innovation Solution
A display apparatus configuration that eliminates the blue color filter by using an organic layer with multiple emission parts and charge generation layers to emit white or blue light, simplifying the structure and process while maintaining color stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a blue color filter is used in the display apparatus, then blue light can be displayed, but the transmission efficiency is low and color stability deteriorates
Solution Approach 1:
The invention extracts and removes the blue color filter from the display apparatus. Instead of using a blue color filter to display blue light, the patent employs an organic light-emitting layer that directly emits blue light through electroluminescence. This extraction eliminates the transmission efficiency and color stability problems associated with blue color filters.
Solution Approach 2:
The invention changes the approach from passive color filtering to active light emission. By using an organic light-emitting layer with specific emissive properties, the system generates blue light directly rather than filtering white light. This color change mechanism through electroluminescence resolves the transmission efficiency and color stability issues.
2Manufacturing precision
If multiple color filters are used to display different colors, then color accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The invention segments the light emission function by using separate organic light-emitting layers for different colors (blue, green, red) rather than using a single white light source with multiple color filters. This segmentation allows each color to be emitted independently, improving color accuracy while simplifying the manufacturing process by eliminating the need for multiple color filter layers.
Solution Approach 2:
The invention inverts the conventional approach by switching from passive color filtering to active color emission. Instead of generating white light and filtering it to obtain colors, the patent uses organic light-emitting layers that directly emit specific colors, thereby improving color accuracy and reducing manufacturing complexity simultaneously.
3Ease of manufacture
If a blue color filter is deposited, then blue light transmission is enabled, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The invention extracts and removes the blue color filter deposition process from the manufacturing workflow. By using an organic light-emitting layer that emits blue light directly, the patent eliminates the need for blue color filter deposition, thereby simplifying the manufacturing process and reducing production time while maintaining blue light display capability.
Solution Approach 2:
The invention changes the manufacturing approach from depositing color filters to depositing organic light-emitting materials with specific emissive properties. This color change mechanism through direct emission eliminates the complex blue color filter deposition process while enabling blue light display.
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 color stability and simplifies the manufacturing process by eliminating the need for a blue color filter, enhancing the display's efficiency and reducing manufacturing complexity.
Implementation Method 1
an organic light emitting diode which emits light... When the injected holes and electrons meet each other, an exciton is formed, and light is emitted when an energy level of the exciton falls to a bottom state
Data Source
AI summary
A display apparatus includes a substrate including an emission area; a plurality of pixels disposed on the substrate in the emission area; a transistor in each of the plurality pixel and an anode connected to the transistor; and an organic layer and a cathode on the anode, wherein the organic layer includes a first emission part, a charge generation layer on the first emission part, and a second emission part on the charge generation layer, wherein the first emission part emits light when a reverse driving is performed to the organic layer, and the second emission part emits light when a forward driving is performed to the organic layer.