AMOLED Light Shielding Layer Design for TFT Stability
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Solution Overview
Problem
The illumination stability of Thin Film Transistor (TFT) in Active Matrix/Organic Light Emitting Diode (AMOLED) products is compromised due to light leakage, which affects the performance and reliability of the AMOLED panel.
Innovation Solution
A display panel design that includes a base substrate with gate and data lines crossing to define pixel areas, featuring a thin film transistor, an Organic Light Emitting Diode (OLED) structure, and a light shielding layer with specific configurations to reduce light leakage, including a first and second light shielding layer with particular projections and openings, and optionally a color filter and planarization layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single light shielding layer is used, then the structure is simple, but light leakage occurs affecting TFT illumination stability
Solution Approach 1:
The light shielding layer is divided into multiple segments (first light shielding layer and second light shielding layer) positioned at different heights above the pixel electrode. This segmentation allows each layer to perform specific shielding functions, effectively blocking light leakage paths that would otherwise affect TFT illumination stability, while maintaining reasonable structural complexity through modular design
Solution Approach 2:
The light shielding structure extends into the vertical dimension by positioning the first and second light shielding layers at different heights above the pixel electrode. This three-dimensional arrangement creates multiple shielding planes that intercept light leakage from different angles and paths, enhancing protection without requiring excessive horizontal space
2Reliability
If the light shielding layer is positioned close to the pixel electrode, then the shielding effect is strong, but the pixel light-emitting area is reduced
Solution Approach 1:
By positioning light shielding layers at different vertical heights above the pixel electrode rather than solely in the horizontal plane, the structure creates three-dimensional shielding zones that block light leakage paths without encroaching on the horizontal pixel light-emitting area, thus maintaining both shielding effectiveness and display area
3Reliability
If the orthogonal projection of the second light shielding portion is located within the orthogonal projection of the first opening portion, then light leakage is reduced, but the manufacturing precision requirement increases
Solution Approach 1:
The first light shielding layer is formed first with its opening portion, establishing a reference structure. The second light shielding layer is then formed with its projection positioned within the first opening portion's projection, creating a nested configuration that guides light blocking while the sequential formation process helps manage alignment requirements through process-controlled positioning
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 configuration increases the distance between the pixel light-emitting area and the thin film transistor, reducing light leakage and improving the reliability of the TFT by minimizing the impact of light leakage on the transistor.
Implementation Method 1
a light shielding layer, including a first light shielding layer arranged on a side of the first electrode away from the base substrate, and a second light shielding layer arranged on a side of the first light shielding layer away from the base substrate
Data Source
AI summary
A display panel, a method for manufacturing the display panel, and a display apparatus are provided. The display panel includes a base substrate; a thin film transistor; an OLED structure formed on the thin film transistor including a first and second electrodes arranged opposite to each other and an organic light emitting layer arranged between the first and second electrodes; a light shielding layer arranged between the first electrode and the organic light emitting layer. The light shielding layer includes a first and a second light shielding layers. The first light shielding layer includes a first light shielding portion and a first opening portion corresponding to a pixel area. The second light shielding layer includes a second light shielding portion and a second opening portion corresponding to a pixel area. The second light shielding portion includes a first and second parts.