Integrated Display Touch Sensing via Layered Scan and Sensing Lines
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Solution Overview
Problem
Existing display apparatuses face challenges in reducing thickness and enhancing sensing sensitivity, particularly in integrating touch panel functionality without increasing thickness or complexity.
Innovation Solution
The display apparatus incorporates a first and second display substrate with scan lines and sensing lines formed on different layers, allowing for reduced thickness and improved sensing sensitivity by eliminating the need for additional layers or substrates, and utilizing drivers to induce magnetic fields and calculate input coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is attached to the display apparatus to enable input device functionality, then sensing capability is improved, but thickness and structural complexity increase
Solution Approach 1:
The patent combines the display panel and touch panel into a single integrated structure. The scan lines and sensing lines are formed within the same display panel using the same substrate and layer structure, eliminating the need for a separate touch panel attachment. This merging approach maintains sensing capability while reducing overall thickness and structural complexity.
Solution Approach 2:
The display panel is designed to perform multiple functions: display function through pixel electrodes and liquid crystal, and sensing function through scan lines and sensing lines. The same substrate and layer structure support both display and touch sensing operations, making the display panel universal for both purposes simultaneously.
2Measurement precision
If additional layers or substrates are added to enhance sensing sensitivity, then sensing sensitivity is improved, but thickness increases
Solution Approach 1:
The patent improves sensing sensitivity by utilizing the vertical stacking of different functional layers within the same plane. The scan lines and sensing lines are positioned at different vertical levels (different layers) within the display panel, creating a three-dimensional sensing structure that enhances sensitivity without increasing the horizontal footprint or overall thickness of the device.
Solution Approach 2:
The sensing structure is nested within the display panel structure. The scan lines and sensing lines are embedded within the existing display panel layers, utilizing the same substrate and interlayer insulating layers. This nesting approach allows the sensing function to be contained within the display panel without adding external thickness.
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
This configuration reduces the thickness of the display panel while enhancing sensing sensitivity for input devices, improving the accuracy and efficiency of coordinate calculations without additional manufacturing complexity.
Implementation Method 1
The first driver applies a scan signal to the scan line to induce a magnetic field by a current path formed by the scan line
Implementation Method 2
The second driver receives a sensing signal from the sensing line, which is generated by a resonant frequency of an input device
Data Source
AI summary
A display apparatus includes a first display substrate, a second display substrate, pixels, a scan line, a sensing line, a first driver, a second driver, and a coordinate calculator. The pixels include pixel rows and pixel columns. The scan line surrounds at least one pixel row of the pixel rows. The sensing line is insulated from the scan line and surrounds at least one pixel column of the pixel columns. The first driver applies a scan signal to the scan line and the second driver outputs a sensing signal provided from the sensing line. The coordinate calculator receives the sensing signal to calculate coordinate information. Each of the scan line and the sensing line is disposed on different layers from each other.