Display Panel Optical Structure for Light Emission Around Pixel Circuitry
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Solution Overview
Problem
Display panels face challenges in emitting light effectively in areas where components are arranged, as separate wirings are typically required to facilitate light emission, which can complicate the design and functionality.
Innovation Solution
A display panel design that includes a substrate, pixel circuit, via layer, pixel electrode, bank layer, reflective plates, high refractive index layer, and encapsulation layer, allowing light emission without separate wirings by utilizing inclined structures and refractive index differences to direct light emission around components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If separate wirings are used to facilitate light emission in component areas, then light emission capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the light emission function with the existing pixel electrode structure. The pixel electrode serves dual purposes: as an electrical conductor for the pixel circuit and as a light emission surface. This eliminates the need for separate wirings dedicated to light emission, thereby reducing device complexity while maintaining illumination capability.
Solution Approach 2:
The pixel electrode is designed to perform multiple functions simultaneously: it acts as an electrical connection element for the thin-film transistor, as a structural component of the display panel, and as a light emission surface. This multi-functionality removes the requirement for additional specialized wirings, simplifying the overall device design.
2Illumination intensity
If inclined structures are used to direct light emission, then light transmission efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes the refractive index parameter of materials to achieve light direction control. By selecting materials with appropriate refractive indices for the pixel electrode and surrounding layers, light is naturally directed at desired angles without requiring precise mechanical inclination. This changes the control mechanism from geometric parameter (angle) to material parameter (refractive index), reducing manufacturing precision requirements.
Solution Approach 2:
The patent applies different material properties with different refractive indices at different locations within the pixel structure. This local variation in optical properties creates the desired light directioning effect, allowing control of light emission characteristics without requiring uniform precise inclination throughout the structure.
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 light emission in areas with components without additional wirings, enhancing design simplicity and functionality while maintaining effective light transmission.
Implementation Method 1
the high refractive index layer has a refractive index that is greater than a refractive index of the via layer or the encapsulation layer
Implementation Method 2
a first reflective plate inclined above the bank layer, apart from the pixel electrode, facing the pixel electrode
Data Source
AI summary
A display panel includes a substrate, a pixel circuit including a thin-film transistor, a via layer above the pixel circuit, and defining a first opening, a pixel electrode inclined above the via layer, electrically connected to the pixel circuit, and having a portion in the first opening, a bank layer above the pixel electrode, and defining a second opening overlapping the first opening, a first reflective plate inclined above the bank layer, apart from the pixel electrode, facing the pixel electrode, and having a portion in the second opening, a high refractive index layer above the pixel electrode and the first reflective plate, and having a portion in the first and second openings, and an encapsulation layer above the high refractive index layer, wherein the high refractive index layer has a refractive index that is greater than a refractive index of the via layer or the encapsulation layer.