Capacitive Touch Panel Integration on OLED Display Substrate
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Solution Overview
Problem
The difficulty in precisely mounting a capacitive touch panel onto organic light emitting display apparatuses results in challenges with high yield and quality during manufacturing.
Innovation Solution
An organic light emitting display apparatus is designed with a substrate, a display unit, and a touch panel that includes a sealing substrate, a ground layer, pattern layers, insulating layers, and connecting units, where the ground and pattern layers are formed using transparent conductive materials like ITO, IZO, or ZnO, and crystallized for enhanced durability, allowing for precise touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a capacitive touch panel is applied to an organic light emitting display apparatus, then the display apparatus can function as both a display device and an input device, but the manufacturing precision and structural precision become difficult to ensure, resulting in low yield and quality
Solution Approach 1:
The patent combines the touch panel structure with the display apparatus structure by integrating the ground layer, pattern layers, and insulating layers directly into the display apparatus assembly. The ground layer is formed on the sealing substrate, and the pattern layers are formed on the opposing surface, merging multiple functional layers into a unified structure that simplifies manufacturing and improves precision.
Solution Approach 2:
The ground layer and pattern layers are formed on the sealing substrate before the final assembly of the display apparatus. This preliminary formation of conductive layers and insulating structures allows for precise positioning and alignment to be established early in the manufacturing process, ensuring high mounting precision when the touch panel is integrated with the display apparatus.
2Measurement precision
If multiple layers (ground layer, pattern layers, insulating layers) are formed on the sealing substrate, then touch detection precision is improved, but the device complexity increases
Solution Approach 1:
The touch panel is segmented into distinct functional layers: a ground layer formed on one surface of the sealing substrate, and pattern layers formed on the opposing surface with insulating layers between them. This segmentation allows each layer to perform its specific function (grounding, touch sensing patterns, insulation) independently, improving touch detection precision while organizing the complexity into manageable, functionally-separated components.
Solution Approach 2:
The patent utilizes the third dimension (depth/thickness of the sealing substrate) to separate different functional layers. The ground layer is positioned on one surface while pattern layers are positioned on the opposing surface, with insulating layers filling the space between. This vertical arrangement in multiple dimensions allows complex functionality to be achieved without increasing the planar footprint, managing device complexity through spatial organization.
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 enables high-precision touch detection with improved durability and manufacturing efficiency, allowing the organic light emitting display apparatus to function both as a display and input device without increasing thickness.
Implementation Method 1
Each of the first pattern layer, the second pattern layer, and the ground layer may include any one selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), aluminum-doped zinc oxide (AZO), and indium oxide (In2O3)
Implementation Method 2
The ground layer may be crystallized. The second pattern layer may be crystallized
Data Source
AI summary
An organic light emitting display apparatus includes a substrate; a display unit formed on the substrate and comprising an organic light emitting device; and a touch panel formed on the display unit, wherein the touch panel further includes a sealing substrate, a ground layer formed on a surface of the sealing substrate, a first pattern layer formed on a surface of the sealing substrate opposite to the surface of the sealing substrate on which the ground layer is formed, a first insulating layer formed on the first pattern layer, a second pattern layer formed on the first insulating layer, and a second insulating layer formed on the second pattern layer.