Touchscreen Frame Narrowing via Overlapping Circuit Layout
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Solution Overview
Problem
Conventional embedded capacitive touchscreens have a relatively wide frame due to the width required for the touch drive electrode lead and gate drive circuit, which occupies a significant non-display area.
Innovation Solution
The touch drive electrode lead and gate drive circuit are disposed in an overlapping manner in the thickness direction of the lower glass substrate, with the touch drive electrode and gate drive circuit being isolated from each other, allowing the touch drive electrode lead to be minimized, thereby reducing the width of the non-display area and achieving a narrower frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the touch drive electrode lead and gate drive circuit are disposed in a conventional non-overlapping manner, then the electrical connection and signal processing are reliable, but the width of the non-display area increases resulting in a wide frame
Solution Approach 1:
The patent applies dimensionality change by transitioning from a two-dimensional planar arrangement to a three-dimensional overlapping arrangement. The touch drive electrode lead and gate drive circuit are disposed in an overlapping manner in the thickness direction of the lower glass substrate, utilizing the Z-axis dimension to reduce their combined width in the X-Y plane, thereby narrowing the frame while maintaining electrical isolation.
Solution Approach 2:
The patent implements nesting by placing the touch drive electrode lead within the spatial footprint of the gate drive circuit in the thickness direction. This nested arrangement allows one component to occupy the same planar area as another component at a different vertical level, effectively reducing the overall width required for both components without increasing device complexity.
2Length of stationary object
If the touch drive electrode lead width is minimized through overlapping arrangement, then the frame becomes narrower, but the isolation between the touch drive electrode lead and gate drive circuit becomes more challenging
Solution Approach 1:
The patent resolves the isolation challenge by utilizing the thickness direction as an additional dimension for separation. The touch drive electrode lead and gate drive circuit are isolated from each other in the thickness direction while maintaining their overlapping planar arrangement, allowing electrical isolation without compromising the narrow frame design.
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 width of the non-display area, resulting in a narrower frame for the touchscreen, enhancing the design efficiency and precision of the capacitive touchscreen.
Implementation Method 1
Capacitance Ctp is formed between two electrodes. When a conductor (for example, a hand) touches the capacitive touchscreen, the capacitance changes, and a touch detection apparatus identifies a touch position based on the change of the capacitance.
Data Source
AI summary
A touchscreen includes a touch drive electrode, a touch sensing electrode, a touch drive circuit, a gate drive circuit, a touch drive electrode lead, and a liquid crystal panel. The touch drive electrode extends along a first direction. The touch drive circuit is disposed in a non-display area of the touchscreen, and an extension direction of the touch drive circuit is parallel to an extension direction of the touch drive electrode. The extension direction of the touch drive circuit is the same as the extension direction of the touch drive electrode. Each touch drive electrode is connected to the touch drive circuit using a touch drive electrode lead. The touch drive electrode lead is disposed in an area in which a gate drive circuit is located. The touch drive electrode lead and the gate drive circuit are disposed in an overlapping manner and are isolated from each other.