Reflective Layer Shields Peripheral Circuit in AMOLED Displays
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Solution Overview
Problem
Current active-matrix organic light emission displays (AMOLEDs) suffer from current leakage at the peripheral circuit area due to external light illumination, affecting display quality, and existing solutions like the color filter with a black matrix are costly and limited to specific emission types.
Innovation Solution
A reflective layer is integrated between the light emission plane and the peripheral circuit area, acting as a light shielding layer suitable for both top and bottom emission AMOLEDs, reducing current leakage and fabrication costs by being formed during the active-matrix array process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a color filter with black matrix is used as light shielding layer, then current leakage is reduced, but fabrication cost increases and structural design is limited
Solution Approach 1:
The invention extracts the light shielding function from the color filter structure and relocates it to a dedicated reflective layer positioned between the substrate and peripheral circuit. This separation eliminates the need for black matrix in color filter structures, reducing fabrication complexity and cost while maintaining effective light shielding to prevent current leakage.
Solution Approach 2:
The invention segments the display structure into distinct functional layers: the color filter handles color rendering while the separate reflective layer handles light shielding. This segmentation allows each layer to be optimized independently, with the reflective layer using simple metallic materials that can be deposited using standard sputtering processes, thereby reducing overall fabrication cost.
2Reliability
If a black matrix is used as light shielding layer, then current leakage is reduced, but the solution is limited to top emission AMOLED only
Solution Approach 1:
The reflective layer serves multiple functions across different emission types: for top emission AMOLED, it shields external light from the peripheral circuit; for bottom emission AMOLED, it reflects light upward to enhance display brightness. This multi-functional design makes the light shielding solution universally applicable to both top and bottom emission configurations without requiring structural modifications.
3Ease of operation
If peripheral circuit is disposed on array substrate, then display function is achieved, but external light causes current leakage at peripheral circuit area
Solution Approach 1:
The invention introduces a reflective layer as an intermediary component between the substrate and the peripheral circuit. This layer acts as a mediator that blocks external light from reaching the peripheral circuit, preventing photoelectric effect and current leakage, while simultaneously reflecting light to enhance display performance. The intermediary layer thus protects the peripheral circuit without interfering with its electrical functionality.
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 reflective layer effectively shields external light from the peripheral circuit, minimizing current leakage and enhancing display quality without the need for a color filter, while being compatible with both emission types and integrating seamlessly with existing processes.
Implementation Method 1
A reflective layer is disposed on the peripheral area of the array substrate, between the light emission plane and the peripheral circuit, covering the peripheral circuit
Implementation Method 2
The organic light emission layer 16 of bottom emission AMOLED has a light emission direction A passing through the array substrate 10 for downward luminescence
Implementation Method 3
thin film transistors in the peripheral circuit are easily illuminated by external light to produce photoelectric effect. As a result, current leakages occur at the peripheral circuit area
Data Source
AI summary
A system for displaying images is provided, including an active-matrix organic light emission display. The active-matrix organic light emission display comprises an active-matrix array on a display area of an array substrate, a peripheral circuit on a peripheral area of the array substrate, a reflective layer on the peripheral area of the array substrate, between a light emission plane and the peripheral circuit and covering the peripheral circuit, an organic light emission layer on the active-matrix array and a cover layer over the organic light emission layer, covering the display area and the peripheral area.