Electroluminescent Device Color Temperature Control via Pixel Define Layer
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Solution Overview
Problem
Existing electroluminescent devices that emit white light face challenges in adjusting color temperature, requiring complex device structures and processes, which affect luminous efficiency and increase production time, and external circuit adjustments complicate circuit design.
Innovation Solution
The method involves forming an electroluminescent device with a first and second light-emitting region by adjusting the area of the first and second color layers through a patterned pixel define layer and connection layers, allowing for control of color temperature by varying the ratio of these areas, without altering the forming order of conductive layers or electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If color temperature is adjusted by optical design inside the device with material selection and electrical adjustment, then color temperature control is achieved, but device structure and process complexity increases and luminous efficiency decreases
Solution Approach 1:
The device is divided into multiple light-emitting units with different color characteristics (red, green, blue color layers). Each unit independently emits light of a specific color, and the overall color temperature is controlled by adjusting the relative emission areas of these segmented units rather than changing material properties or electrical parameters of a single unit.
Solution Approach 2:
Different regions of the device have different color emission characteristics. The red, green, and blue color layers are distributed at specific locations, and by adjusting the emission area of each local region (through pixel define layer opening sizes), the overall color temperature is controlled without affecting the material composition or electrical structure.
2Temperature
If color temperature is adjusted by optical design inside the device, then color temperature control is achieved, but production time increases due to conversion process
Solution Approach 1:
The device structure is pre-configured with multiple color layers (red, green, blue) and the pixel define layer with different opening sizes during the initial manufacturing process. This preliminary arrangement of different color emission areas allows color temperature adjustment without requiring subsequent conversion processes, thereby reducing production time.
3Temperature
If external circuit is used to independently control luminous intensity ratios of different light-emitting units, then color temperature control is achieved, but circuit design complexity and difficulty increases
Solution Approach 1:
The color temperature control function is extracted from the electrical circuit domain and transferred to the structural/optical domain. Instead of using external circuits to control luminous intensity ratios, the invention uses the physical arrangement and area ratios of pixel define layer openings to directly determine the emission area of each color unit, thereby eliminating the need for complex circuit control.
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 approach simplifies the manufacturing process, reduces the impact on luminous efficiency, and allows for precise control of color temperature without increasing the complexity of the device structure or circuit design.
Implementation Method 1
When current passes through an electroluminescent device, electrons and holes will recombine in a color layer to generate excitons, and light in different wavelengths will be emitted according to a material characteristic of the color layer.
Data Source
AI summary
An electroluminescent device includes a substrate, a first electrode, a patterned pixel define layer, a first color layer, a first connection layer, a second color layer, and a second electrode. The patterned pixel define layer has a first opening. A projected area of the first opening on the substrate is A. The first color layer is located in the first opening and electrically connected to the first electrode. A projected area of the first connection layer on the substrate is B. The second color layer is located between the first connection layer and the second electrode. When a ratio of B to A is r1, light emitted by the electroluminescent device has a first color temperature. When the ratio of B to A is r2, the light emitted by the electroluminescent device has a second color temperature.