OLED Display Panel Touch Control Integration
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Solution Overview
Problem
The complexity of forming a touch control layer in OLED display panels increases manufacturing costs due to intricate processes, making it difficult to integrate effectively with the display assembly.
Innovation Solution
An OLED display panel design that incorporates a metal grid touch control layer insulated by multiple layers, positioned between anodes and cathodes, which also functions to seal the light-emitting layer, simplifying the formation process and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch control layer is formed on the OLED display panel, then touch control function is achieved, but manufacturing complexity increases and cost rises
Solution Approach 1:
The patent merges the touch control layer with the display structure by positioning the touch control electrodes between the anodes and light-emitting layers, integrating two functional layers into a unified structure that reduces manufacturing steps and complexity
Solution Approach 2:
The touch control module serves multiple functions: it provides touch control capability while simultaneously acting as part of the display pixel structure, with the pixel defining layer serving both as a structural element and as an insulator for the touch control electrodes
2Adaptability or versatility
If a touch control layer is formed on the OLED display panel, then touch control function is achieved, but manufacturing cost increases
Solution Approach 1:
By combining the touch control layer formation with existing display manufacturing processes, the patent avoids additional expensive steps. The touch control electrodes are formed using the same patterning and deposition processes as the display electrodes
Solution Approach 2:
The existing display structure components (anodes, pixel defining layer, insulating layers) automatically serve the dual purpose of display functionality and touch control support, eliminating the need for separate dedicated touch control structures
3Ease of operation
If the touch control module is positioned between anodes and cathodes, then touch control sensitivity is improved, but encapsulation complexity increases
Solution Approach 1:
The pixel defining layer and insulating layers serve dual purposes: they provide electrical insulation for the touch control electrodes while simultaneously forming the encapsulation structure for the light-emitting layer, eliminating the need for separate encapsulation layers
4Reliability
If the touch control module uses multiple insulating layers, then insulation reliability is improved, but manufacturing steps increase
Solution Approach 1:
The patent combines multiple insulating functions into a single integrated insulating structure formed during the display manufacturing process, where the pixel defining layer and inter-layer dielectric layers work together to provide both insulation and encapsulation
Data Source
AI summary
The present disclosure provides an organic light emitting diode (OLED) display panel including a thin film transistor (TFT) layer, a planarization layer, a plurality of anodes, and a touch control module that are sequentially formed on the substrate. The touch control module is positioned in a gap between any two adjacent anodes. The display panel further includes a pixel defining layer disposed at least at two sides of the touch control module, wherein the pixel defining layer in combination with the touch control module defines a pixel area; a light-emitting layer disposed on the anodes to correspond to the pixel area; and a plurality of cathodes, arranged in an array, on the light-emitting layer. The touch control module is positioned in a gap between any two adjacent cathodes.