In-cell Touch Display Circuit Integration
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Solution Overview
Problem
Conventional touch display devices have a thicker structure due to the superposition of multiple substrate layers, which hinders the trend towards ultra-thin devices and increases production costs.
Innovation Solution
The integration of touch scanning and display scanning circuits into a single display TFT array substrate, eliminating the need for a separate touch substrate and reducing thickness while maintaining touch functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a separate touch substrate is used in conventional touch display devices, then touch functionality is achieved, but device thickness increases
Solution Approach 1:
The patent merges the touch substrate layer with the color filter substrate layer into a single integrated layer. The touch detecting lines are formed within the color filter substrate, eliminating the need for a separate touch substrate. This combining of layers directly reduces device thickness while maintaining both display and touch functionalities through shared structural elements.
Solution Approach 2:
The color filter substrate is designed to serve dual functions: it acts as both the color filter layer for display and the touch sensing layer for touch input. By integrating touch detecting lines within the color filter substrate, a single layer performs multiple functions that previously required separate layers, thereby reducing overall device thickness without compromising functionality.
2Ease of manufacture
If multiple substrate layers are superposed, then touch and display functions are integrated, but production cost increases
Solution Approach 1:
The patent reduces the number of separate substrate layers by merging the touch substrate and color filter substrate into one integrated layer. This reduction in layer count simplifies the manufacturing process, reduces material usage, and lowers production costs while maintaining the ability to provide both touch sensing and display functions through the integrated structure.
3Area of stationary object
If touch scanning circuit and display scanning circuit are integrated, then routing area is reduced, but circuit design complexity increases
Solution Approach 1:
The patent integrates the touch scanning circuit and display scanning circuit into a single unified circuit structure within the color filter substrate. This merging of scanning circuits reduces the routing area required for separate circuit paths and minimizes the overall circuit footprint. The integrated design uses shared signal lines and control mechanisms to manage both touch and display scanning operations from a single circuit architecture.
Data Source
AI summary
An in-cell touch display device comprises a plurality of pixel structures, a display scanning circuit, a touch scanning circuit, and a control module. The pixel structures are applied to display an image and include a plurality of display scanning lines and a plurality of common electrodes. The display scanning circuit is coupled with the display scanning lines for actuating the pixel structures to display the image. The touch scanning circuit is coupled with the common electrodes so as to receive a touch signal by scanning the common electrodes. The control module is coupled with the display scanning circuit and the touch scanning circuit to receive and process the touch signal for executing the touch step. The display scanning circuit and the touch scanning circuit are integrated on the same substrate to reduce the thickness of the touch display device without affecting the touch effect.