OLED Display Layer Layout for Low-Reflectance Color Purity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices suffer from high external light reflectance and color separation due to reflected light, which degrades image quality.
Innovation Solution
A light emitting display device design that includes a black pixel defining layer, a light blocking layer, and a color filter configuration to minimize external light reflectance and color separation by blocking reflected light, with an anode-connecting opening under the black pixel defining layer and overlapping with a sensing electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional display device structure is used, then the device is simple to manufacture, but external light reflectance is high and color separation occurs
Solution Approach 1:
The display device structure is segmented into multiple functional layers including a black pixel defining layer, light blocking layer, color filter layer, and sensing electrode layer. Each layer performs a specific function: the black pixel defining layer defines pixel boundaries and blocks light, the light blocking layer prevents external light reflection, the color filter layer manages color separation, and the sensing electrode layer detects touch input. This segmentation allows each component to address specific optical issues independently, reducing overall external light reflectance and color separation while maintaining manufacturability.
Solution Approach 2:
The patent introduces a vertical stacking dimension by positioning the anode-connecting opening to overlap with the sensing electrode in the vertical direction while being covered by the black pixel defining layer and light blocking layer in the planar direction. This multi-dimensional arrangement allows the sensing electrode to function beneath the optical layers without causing asymmetric light reflection or color separation, as the opening is strategically positioned to align with the sensing electrode's location rather than disrupting the optical path.
2Object-affected harmful factors
If the anode-connecting opening is exposed without coverage, then electrical connection is simple, but asymmetric light reflection and color separation occur
Solution Approach 1:
The patent merges multiple functions into the black pixel defining layer and light blocking layer: they simultaneously serve as pixel boundary definers, light blocking elements, and protective covers for the anode-connecting opening. By combining these functions into unified layers that overlap the opening, the design prevents asymmetric light reflection and color separation without requiring separate protective structures, thus managing complexity while achieving optical performance goals.
Solution Approach 2:
The black pixel defining layer and light blocking layer act as intermediary elements between the anode-connecting opening and the external environment. These layers mediate the interaction between the electrical connection requirement (openning) and the optical performance requirement (no asymmetric reflection), by providing coverage that prevents direct light interaction with the opening while allowing the electrical connection to function beneath the layers.
3Object-affected harmful factors
If multiple layers are added to block light, then external light reflectance is reduced, but manufacturing complexity increases
Solution Approach 1:
The black pixel defining layer and light blocking layer are designed to perform multiple functions simultaneously: defining pixel boundaries, blocking external light, covering the anode-connecting opening, and enabling sensing electrode functionality. This multi-functionality reduces the need for additional dedicated layers, thereby limiting the increase in manufacturing complexity while achieving comprehensive light blocking and color separation prevention.
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 design achieves minimal external light reflectance and color separation, ensuring high-quality image display by preventing asymmetric light reflection and maintaining image clarity.
Implementation Method 1
a light blocking layer disposed on the encapsulation layer and having a color filter opening
Implementation Method 2
a color filter filling the color filter opening of the light blocking layer
Implementation Method 3
a sensing electrode overlapping the light blocking layer in a plan view and covered by the light blocking layer
Data Source
AI summary
A display device includes an organic layer, an anode, a pixel defining layer, a cathode, a light emitting layer, a light blocking layer, a color filter, and a sensing electrode. The organic layer includes an anode-connecting opening. The anode is disposed on the organic layer and is partially disposed inside the anode-connecting opening. The pixel defining layer includes an anode-exposing opening that exposes the anode. The cathode overlaps the anode. The light emitting layer is between the anode and the cathode. The light blocking layer overlaps the cathode and includes a blocking layer opening. The color filter fills the blocking layer opening. The sensing electrode is at least partially covered by the light blocking layer. The anode-connecting opening overlaps with each of the sensing electrode, the pixel defining layer, and the light blocking layer in a plan view of the display device.