OLED Panel Color Temperature Adjustment via Layer Segmentation
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Solution Overview
Problem
Existing white-light OLED displays have difficulty adjusting color temperature after manufacturing, limiting their application areas due to fixed light emission intensity control through voltage, which restricts their ability to meet varying color display requirements.
Innovation Solution
An organic light-emitting display panel with a structure comprising light-emitting elements having a first and second light-emitting layer with different wavelengths, where the first electrode, second electrode, and third electrode are connected to different voltage signal terminals, allowing for independent control of voltage across each layer to adjust the color temperature by varying the intensity of emitted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If white-light OLED display is manufactured in an integral structure with fixed light-emitting layers, then manufacturing cost is reduced, but color temperature cannot be adjusted after manufacturing
Solution Approach 1:
The light-emitting module is divided into multiple light-emitting layers with different emission wavelengths (first, second, and third light-emitting layers). Each layer can be independently controlled through separate electrodes, enabling dynamic color temperature adjustment while maintaining a relatively simple integrated structure that is easier to manufacture than traditional multi-component systems.
Solution Approach 2:
The patent introduces dynamic control capability by connecting each light-emitting layer to independent electrodes (first, second, and third electrodes) that can apply different voltages. This allows the color temperature to be dynamically adjusted after manufacturing by varying the voltage applied to each layer, transforming a static integrated structure into a dynamically adjustable system.
2Device complexity
If light emission intensity is controlled only as a function of voltage applied across light-emitting elements, then device structure is simplified, but color temperature adjustment capability is lost
Solution Approach 1:
The device structure is segmented into multiple light-emitting layers with independent electrode control. Instead of a single voltage control for the entire light-emitting element, each layer has its own electrodes, allowing selective control of each layer's emission intensity to achieve color temperature adjustment while maintaining relatively simple individual layer structures.
Solution Approach 2:
The independent electrode structure serves multiple functions: it controls the emission intensity of each light-emitting layer individually, enables color temperature adjustment, and maintains a relatively simple overall device structure. This multi-functional design allows the same structural elements to achieve both simplified construction and advanced control capabilities.
3Ease of manufacture
If fixed color temperature is used in OLED display, then manufacturing process is simplified, but application areas are limited
Solution Approach 1:
The manufacturing process maintains simplicity by using a standard OLED fabrication process to create the multi-layer structure. The dynamic capability is added through the electrode configuration that allows post-manufacturing voltage control, enabling the same manufacturing process to produce displays adaptable to various application scenarios with different color temperature requirements.
Solution Approach 2:
The patent enables parameter changes (color temperature) by controlling the voltage applied to each light-emitting layer. The manufacturing process remains relatively simple as it produces a structure with different wavelength-emitting layers, and the adaptability is achieved by changing the electrical parameters (voltage) applied to each layer during operation to suit different application areas.
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
Enables dynamic adjustment of color temperature by controlling the voltage across the light-emitting layers, enhancing the display's versatility and adaptability to different scenarios without altering the physical structure, thus expanding its application possibilities.
Implementation Method 1
each of the light-emitting elements includes a first electrode, a first light-emitting layer, a second electrode, a second light-emitting layer, and a third electrode arranged on the underlying substrate in that order in a light exit direction of the organic light-emitting display panel
Data Source
AI summary
The disclosure discloses an organic light-emitting display panel, a method for adjusting color temperature thereof, and a display device, and the organic light-emitting display panel includes: an underlying substrate, and a plurality of light-emitting elements arranged on the underlying substrate; each of the light-emitting elements includes a first electrode, a first light-emitting layer, a second electrode, a second light-emitting layer, and a third electrode arranged on the underlying substrate in that order in a light exit direction of the organic light-emitting display panel, where a wavelength of emitted light from the first light-emitting layer is greater than a wavelength of emitted light from the second light-emitting layer; and the first electrode, the second electrode, and the third electrode are connected respectively with different voltage signal terminals.