OLED Display Panel Light Shielding Groove Structure
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) display panels suffer from low light emitting efficiency and edge light leakage, leading to increased power consumption and reduced battery life due to strong lateral light transmission and absorption by film layers.
Innovation Solution
A display panel structure with a source drain layer, first and second planarization layers, an anode layer, light emitting functional layer, and cathode layer, where the second planarization layer includes a light shielding structure with grooves that block lateral light, and the anode layer covers these grooves to enhance light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional pixel defining layer structure is used, then the device complexity is low, but light emitting efficiency is less than 20% and edge light leakage occurs
Solution Approach 1:
The planarization layer is divided into a first planarization layer and a second planarization layer, with the second layer being patterned to form light shielding structures and grooves. This segmentation allows the structure to simultaneously achieve planarization and light management functions, improving light emitting efficiency while maintaining manageable complexity through functional division.
Solution Approach 2:
The second planarization layer serves multiple functions: it provides planarization for subsequent layers, forms light shielding structures to block lateral light, creates grooves for precise light emitting functional layer positioning, and forms inclined planes to control light propagation. This multi-functionality improves light emitting efficiency without proportionally increasing device complexity.
2Object-affected harmful factors
If the pixel defining layer has strong light transmission, then manufacturing is simpler, but lateral light cannot be blocked causing stray light and reduced signal-to-noise ratio
Solution Approach 1:
The second planarization layer is patterned to create light shielding structures in specific locations where lateral light blocking is needed, while maintaining transparency in other areas. This local quality approach blocks harmful lateral light where necessary without compromising overall manufacturing simplicity or requiring complete opacity.
Solution Approach 2:
The light shielding structures in the second planarization layer act as intermediary elements between the light emitting functional layer and the pixel defining layer. These intermediaries selectively block lateral light to prevent stray light and improve signal-to-noise ratio, while the inclined planes mediate light propagation to further control lateral light escape.
3Illumination intensity
If source power is increased to compensate for low light emitting efficiency, then brightness is improved, but power consumption increases and battery life is reduced
Solution Approach 1:
The patent replaces the mechanical approach of increasing source power with an optical structure-based solution. The light shielding structures, grooves, and inclined planes work together to redirect and control light propagation, improving brightness through optical management rather than increased energy input, thereby reducing power consumption.
4Object-affected harmful factors
If the second planarization layer is added with light shielding structures, then edge light leakage is prevented, but device complexity and manufacturing steps increase
Solution Approach 1:
The light shielding structures are merged with the second planarization layer, combining the planarization function with the light blocking function in a single integrated structure. This merging prevents edge light leakage while avoiding the need for separate light blocking layers, thereby limiting the increase in device complexity.
Solution Approach 2:
The light shielding effect is achieved not just through vertical layering but through the inclined planes formed by the patterned second planarization layer. This dimensional approach uses the slope geometry to redirect lateral light, adding a geometric dimension to light control that prevents edge light leakage without requiring additional vertical layers.
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 edge light leakage and improves light emitting efficiency, reducing power consumption and increasing battery life by optimizing the planarization layers' tilt angles and distances to the light emitting functional layer.
Implementation Method 1
the second planarization layer comprises a light shielding structure and a first groove formed by the light shielding structure
Implementation Method 2
an angle formed between a first inclined plane of the first groove and an upper surface of the first planarization layer ranges from 45° to 55°
Data Source
AI summary
The present invention provides a display panel, a display device, and a manufacturing method of the display panel. The display panel includes a source drain layer, a first planarization layer, a second planarization layer, an anode layer, a light emitting functional layer, and a cathode layer which are sequentially stacked from bottom to top. The second planarization layer includes a light shielding structure and a first groove formed by the light shielding structure. The anode layer completely covers the first groove and is extended to cover a portion of the second planarization layer. The light emitting functional layer is disposed on the anode layer in the first groove.