OLED Display Touch Driver Integration on Window
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Solution Overview
Problem
Existing OLED displays face challenges in reducing thickness while maintaining touch sensing functionality, as the flexible printed circuit touch board is typically thick and wide, and not easily bendable, which hinders the overall slimness and flexibility of the device.
Innovation Solution
The touch driver is formed on the inner side of the window instead of the flexible printed circuit board, allowing for a reduction in the thickness and width of the touch board, and enabling easier bending, thus reducing the overall thickness of the OLED display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible printed circuit touch board is used for touch sensing, then touch sensing functionality is achieved, but the thickness and width of the OLED display increases
Solution Approach 1:
The touch driver is integrated directly onto the window layer, merging the touch sensing control function with the display structure. This eliminates the need for a separate flexible printed circuit touch board, thereby reducing the overall thickness while maintaining complete touch sensing functionality.
Solution Approach 2:
The touch driver function is extracted from the flexible printed circuit board and placed directly on the window layer. This separation allows the flexible printed circuit board to be reduced in size and thickness, as it no longer needs to accommodate the touch driver components.
2Reliability
If the flexible printed circuit touch board is used, then touch sensing is enabled, but the device becomes less flexible and harder to bend
Solution Approach 1:
By integrating the touch driver directly onto the window layer, the design eliminates the rigid flexible printed circuit board structure. This merging of functions allows the touch sensing system to maintain capability while significantly improving the overall flexibility and bendability of the display device.
3Reliability
If the flexible printed circuit touch board is used, then touch sensing functionality is provided, but the overall width of the display increases
Solution Approach 1:
The touch driver is merged with the window layer structure, eliminating the need for a separate flexible printed circuit board that would extend the display width. This integration maintains full touch sensing functionality while reducing the overall width of the display device.
Data Source
AI summary
An organic light-emitting diode (OLED) display is disclosed. In one aspect, the OLED display includes a display substrate, an encapsulation substrate formed over the display substrate, and a window formed over the encapsulation substrate, wherein the window includes a surface facing the display substrate. The OLED display further includes a contact sensing layer formed on the surface of the window and a touch driver formed on the surface of the window and electrically connected to the contact sensing layer, wherein the touch driver is configured to drive the touch sensing layer.