OLED Luminance Uniformity via Non-Uniform Heat Dissipation
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Solution Overview
Problem
Organic light emitting diode (OLED) devices face issues with luminance non-uniformity due to low conductivity of transparent electrodes, leading to inhomogeneous potential and current distribution, which exacerbates with increased panel area and luminance intensity.
Innovation Solution
The solution involves increasing the vertical organic semiconductor resistance value relative to the anode resistance by employing a cooling device, such as a heat sink, or using a highly conductive auxiliary metal electrode to reduce effective horizontal resistance, and optimizing the resistance distribution to achieve uniform current and temperature distribution across the OLED device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the panel area and luminance intensity are increased, then the luminous output is improved, but the luminance non-uniformity worsens
Solution Approach 1:
The patent applies local quality by creating non-uniform temperature distribution across the OLED panel, with cooler regions at the periphery and warmer regions at the center. This is achieved through strategic heat dissipation structures that selectively cool different areas to compensate for the natural current density non-uniformity, thereby improving overall luminance uniformity while maintaining high luminance intensity
Solution Approach 2:
The patent changes the temperature parameter distribution across the OLED panel to improve luminance uniformity. By controlling and varying the temperature at different locations (cooler periphery, warmer center), the patent optimizes the electrical and optical properties of the OLED materials to achieve more uniform current distribution and luminance output across the panel area
2Device complexity
If the transparent electrode conductivity is low, then the device structure is simpler, but the current distribution becomes inhomogeneous
Solution Approach 1:
The patent introduces temperature control as an intermediary parameter to mediate between the transparent electrode conductivity and current distribution uniformity. By using heat dissipation structures as intermediaries to create specific temperature profiles, the patent indirectly controls current distribution without modifying the transparent electrode structure, thus maintaining structural simplicity while improving current uniformity
Solution Approach 2:
The patent changes the temperature parameter to compensate for the effects of low transparent electrode conductivity. By strategically cooling the periphery and allowing the center to remain warmer, the patent modifies the electrical properties of the materials to achieve more uniform current distribution, effectively decoupling current uniformity from transparent electrode conductivity requirements
3Temperature
If heat is dissipated uniformly across the OLED device, then the temperature distribution is even, but the luminance uniformity is reduced
Solution Approach 1:
The patent inverts the conventional approach to heat dissipation by implementing non-uniform heat dissipation instead of uniform heat dissipation. Specifically, it dissipates heat more aggressively at the periphery while maintaining higher temperatures at the center, which is the opposite of what would be expected for uniform temperature control. This inverted strategy compensates for the natural current density distribution to achieve better luminance uniformity
Solution Approach 2:
The patent applies local quality by creating distinct temperature zones across the OLED panel - cooler zones at the periphery and warmer zones at the center. This localized temperature control is achieved through periphery-oriented heat dissipation structures that selectively remove heat from specific regions, optimizing the electrical and optical properties locally to improve overall luminance uniformity
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 enhances luminance uniformity and increases luminous intensity across the OLED panel, improving its overall performance and efficiency by maintaining a lower temperature at the periphery area and reducing heat generation at the center.
Implementation Method 1
dissipating heat of the OLED device in a defined pattern
Implementation Method 2
dissipating heat from the device from a substantially hollow component
Implementation Method 3
organic light emitting diode (OLED) device including: an anode; a semiconductor material coupled to the anode; and a cathode coupled to the semiconductor material
Data Source
AI summary
An apparatus facilitating luminosity uniformity across an organic light emitting diode (OLED) device is provided. In one embodiment, the method includes: operating an organic light emitting diode (OLED) device including an anode; a semiconductor material coupled to the anode; and a cathode coupled to the semiconductor material. The method also includes dissipating heat of the OLED device in a defined pattern to increase a luminosity uniformity of the OLED device, wherein the dissipating the heat in the defined pattern comprises causing a first temperature value at a first region of the OLED device and causing a second temperature value at a second region of the OLED device.