In-Cell Touch OLED Substrate with Insulated Electrode Layers
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Solution Overview
Problem
Conventional touch display organic light emitting diodes (OLEDs have a large thickness and are prone to damage due to the separate manufacturing and bonding of display and touch modules, which complicates their structure and increases vulnerability.
Innovation Solution
A touch display substrate is designed with an array of pixels, each comprising a first region for image display and a second region for touch control, featuring a first and second light emitting layer, electrode layers, and a touch electrode layer, where the touch electrode layer is electrically insulated from the second electrode layer, allowing for a compact in-cell touch structure that can be manufactured together with the display module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch module is added onto the display module and bonded separately, then touch functionality is achieved, but the thickness increases and the structure becomes more vulnerable to damage
Solution Approach 1:
The patent merges the touch module and display module into a single integrated substrate. The touch electrode layer is formed on the same substrate as the OLED display structure, eliminating the need for separate bonding of touch and display modules. This integration reduces the overall thickness and creates a more robust single-piece structure that is less vulnerable to damage from bonding interfaces.
2Adaptability or versatility
If a touch module is added onto the display module and bonded separately, then touch functionality is achieved, but the structure becomes more complex and prone to damage
Solution Approach 1:
The patent combines multiple functions (display and touch control) into a single integrated structure on one substrate. The touch electrode layer, display electrode layers, and light emitting layers are all formed on the same substrate through a unified manufacturing process, reducing structural complexity and eliminating vulnerable bonding interfaces between separate modules.
3Adaptability or versatility
If separate display and touch modules are bonded together, then touch functionality is achieved, but manufacturing efficiency decreases and damage risk increases
Solution Approach 1:
The patent integrates touch and display manufacturing into a single production process. Both the OLED display structure and touch electrode layer are formed on the same substrate in sequence, eliminating the need for separate manufacturing and bonding operations. This integration improves manufacturing efficiency by reducing process steps and minimizing the risk of damage during assembly.
4Adaptability or versatility
If separate display and touch modules are bonded together, then touch functionality is achieved, but the aperture ratio decreases
Solution Approach 1:
The patent utilizes the vertical dimension (z-axis) to accommodate multiple functional layers. The touch electrode layer, display electrode layers, and light emitting layers are stacked in different vertical positions on the same substrate plane, allowing both touch and display functions to coexist without occupying additional horizontal space. This maintains a high aperture ratio while achieving integrated touch functionality.
Data Source
AI summary
The present application discloses a touch display substrate including an array of a plurality of pixels. Each pixel includes a first region and a second region in plan view of the touch display substrate. Each pixel includes a first electrode layer on a base substrate comprising plurality of first electrode blocks in the first region, each of which corresponding to a subpixel; and a second electrode block in the second region; a first light emitting layer in the first region on a side of the plurality of first electrode blocks distal to the base substrate; a second light emitting layer in the second region on a side of the second electrode block distal to the base substrate; a second electrode layer in the first region on a side of the first light emitting layer distal to the plurality of first electrode blocks; and a touch electrode layer in the second region on a side of the second light emitting layer distal to the second electrode block; the touch electrode layer and the second electrode layer spaced apart and electrically insulated from each other.