Display Touch Sensing via Pixel Driving Circuit Integration
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Solution Overview
Problem
Display apparatuses have a complex configuration due to the panel driving circuit and touch driving circuit, which complicates the sensing of user touch inputs.
Innovation Solution
A display apparatus with a simplified configuration, featuring a substrate with a display area and non-display area, including pixel driving chips and touch electrodes, where sensing driving pixels are electrically connected to touch electrodes to sense capacitance variations for touch input detection, reducing the number of transfer lines and simplifying the touch sensing mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate touch driving circuit is added to sense user touch, then touch sensing capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the touch sensing function with the existing pixel driving circuit by integrating touch electrodes into the display panel structure and using the same driving circuitry to control both pixel operation and touch sensing, thereby achieving touch capability without adding separate complex touch driving circuits
Solution Approach 2:
The pixel driving circuit is designed to perform dual functions: driving the display pixels and sensing touch inputs. The driving circuit can switch between pixel driving mode and touch sensing mode, making the circuit universal and eliminating the need for dedicated separate circuits
2Measurement precision
If multiple transfer lines are added for touch sensing, then touch sensing precision is improved, but device complexity increases
Solution Approach 1:
The patent combines touch sensing lines with existing display signal lines, using the same data lines and control lines for both pixel driving and touch sensing purposes. This merging approach eliminates the need for separate dedicated touch sensing lines while maintaining sensing precision
Solution Approach 2:
The transfer lines are designed with multi-functionality, serving both as data transmission lines for pixel driving and as sensing lines for touch detection. The lines can dynamically switch between these functions based on operational requirements, reducing the total number of lines needed
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 efficient and simplified touch sensing with reduced complexity in the display apparatus, minimizing the number of transfer lines and enhancing touch sensitivity while maintaining image display functionality.
Implementation Method 1
sensing driving pixels respectively and electrically connected to the plurality of touch electrodes... to sense capacitance variations for touch input detection
Data Source
AI summary
A display apparatus including a substrate including a display area includes a plurality of pixel areas and a non-display area surrounding the display area, a plurality of pixels including a pixel driving chip provided in each of the plurality of pixel areas of the substrate and a light emission part connected to the pixel driving chip, and a plurality of touch electrodes disposed in the display area to overlap two or more pixels. A first pixel driving chip of two or more pixel driving chips overlapping a corresponding touch electrode of the plurality of touch electrodes is connected to the corresponding touch electrode.