Touch Display Device with Shared LED Electrode
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Solution Overview
Problem
Current touch display devices face challenges in reducing thickness, simplifying manufacturing processes, and lowering costs due to the complexity of integrating touch sensors with display panels.
Innovation Solution
The integration of a touch sensor with the anode or cathode of a light-emitting diode in the display panel, where the electrode of the light-emitting diode serves as both a touch electrode and a driving electrode, allowing for shared functionality during display and touch operation periods, reducing the need for additional components and manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate touch sensor layer is integrated with the display panel, then touch sensing functionality is achieved, but device thickness increases and manufacturing complexity increases
Solution Approach 1:
The patent merges the touch sensor electrode with the light-emitting diode electrode, making them a single integrated structure. The same electrode serves dual purposes: driving the LED during display operation and sensing touch input during touch operation periods, thereby eliminating the need for a separate touch sensor layer and reducing overall device thickness.
Solution Approach 2:
The electrode is designed to perform multiple functions: it acts as a driving electrode for the light-emitting diode during display periods and as a touch sensing electrode during touch sensing periods. This multi-functionality eliminates the need for dedicated separate components for each function, thereby reducing device thickness and simplifying structure.
2Adaptability or versatility
If a separate touch sensor layer is integrated with the display panel, then touch sensing functionality is achieved, but manufacturing process complexity increases
Solution Approach 1:
The patent combines the touch sensor electrode and LED electrode into a single integrated structure, which simplifies the manufacturing process by reducing the number of layers and materials that need to be deposited and patterned separately. This merging eliminates complex alignment and integration steps between separate touch and display layers.
Solution Approach 2:
By designing the electrode to serve both as an LED driving electrode and a touch sensing electrode, the patent reduces the total number of components that need to be manufactured and integrated. This multi-functional design simplifies the manufacturing process and reduces production complexity.
3Measurement precision
If additional touch sensor components are added to the display panel, then touch sensing capability is improved, but manufacturing costs increase
Solution Approach 1:
The patent makes the LED electrode serve dual purposes as both a driving electrode and a touch sensing electrode. This eliminates the need to manufacture and integrate separate touch sensor components, thereby reducing material costs, processing costs, and overall manufacturing expenses while maintaining touch sensing capability.
4Length of stationary object
If the electrode serves dual functions as both LED driver and touch sensor, then device thickness is reduced and manufacturing is simplified, but electrical interference between display and touch operations may occur
Solution Approach 1:
The patent employs periodic switching between display operation mode and touch operation mode. During display periods, the electrode functions as an LED driving electrode; during touch sensing periods, it functions as a touch sensing electrode. This time-division multiplexing approach allows the same electrode to serve dual functions while preventing electrical interference by ensuring only one function is active at any given time.
Solution Approach 2:
The patent dynamically reconfigures the electrical connection of the electrode based on operational mode. Control transistors switch the electrode's connectivity: connecting it to the LED during display operations and connecting it to the touch driver during touch sensing operations. This dynamic switching enables the electrode to adapt its function in real-time, preventing interference between the two operational modes.
Data Source
AI summary
A touch display device and a method for driving the same is disclosed. The present disclosure provides a touch display device including a display panel including sub-pixels, a touch sensor including a touch electrode formed electrically in common with an electrode of a light-emitting diode included in the sub-pixels, and a touch driver configured to sense the touch sensor, wherein the electrode of the light-emitting diode serves as the touch electrode for a turn-off period of an emission control transistor for controlling emission of the light-emitting diode.